Best Room Air Conditioner

The Haier HWE12XCR 12000-BTU Room Air Conditioner is our best room air conditioner, which is quite smart enough to tell you if the filter needs to be cleaned as a warning light comes on. It is a high efficiency that works within 5 minutes to cool down a room and it can be used to cool down the home when you feel hot in the afternoon.

Our step-up pick is the Honeywell MN12CESBB 12,000 BTU Air Conditioner and the room air conditioner uses a 3-in-1 technology that can help cool down any sun room or living room with its touch control LCD screen display. At 12,000 BTUs of air conversion, the unit is built with a solid construction that can last all summer and all year round.

The budget pick is the GE AHM05LW 5500-BTU Room Air Conditioner and this air conditioner consumes only 460 watts so it is very economical and energy efficient. It is not too bad for the cost and it has an easy to use remote control works well. The window opening measures 36 x 13 3/8 inches for this model and it has an energy saver mode for keeping your energy bill small.

A Little Background

Room air conditioners can be classified into various types. For example, the most common type is the window type air conditioner, if you just need to cool one room. If you want to cool many rooms then you can go for a central or ductless air conditioner. If you want a transferrable or mobile air conditioner then you can go for a portable AC unit instead.
If you maintain a home office or work as a freelancer at home, putting up an AC unit in your room improves your work mood and can also help you sleep better right after work. If you feel really stressed about something like a deadline or back job from a client then the cold air from the AC unit can actually have a soothing effect for your mood versus a very hot temperature indoors.
The benefits of having an air conditioning unit at home in your room can vary from physical to psychological effects. It not only improves the air quality in your home and lessens the chances of heatstroke, asthma and allergy attacks, it also helps people who are often stressed or tired to feel relaxed, and those who feel lazy to work to get them moving. Decision making is better in cool environments, which is why offices are usually fully air conditioned.
Because the air we breathe outside could be potentially polluted by allergens, pollen, irritants and the like, you might compromise on your health and safety. Indoors, the air can be inhabited by such sickness causing airborne elements so you may need something like a room air conditioner to help eliminate those. Most AC units come with air filters that can alleviate allergies, asthma and the like, aside from keeping you cool and comfortable all day.
A window type air conditioner can be found on different places, such as in apartments, regular homes, bedrooms, dorm rooms, offices, small grocery stores, small businesses and much more. They can be installed easily on small to medium sized spaces and are also commonly found on various public places.
The window type air conditioner is the most common type of air conditioner due to its wide availability, accessibility, ease of control and low upfront cost. The window type air conditioner can be found in most apartments and homes, especially on bedrooms. If you are a budget saver then you can go for a window type AC.
Having a clean air is a big responsibility, even if you do have an air conditioner. Cleaning up the air filter on a regular basis is highly important because it will help you reduce the pathogens and airborne particles that get stuck in the air filter for a long time. Ensuring that your air filter is clean all the time also ensures that your indoor air quality is good.
Air conditioners are great business investments to have because not only are they powerful enough to cool down an office or room, they can also cool areas as big as a grocery store or shopping mall. Most air conditioners are needed for nearly all business types due to the convenience it gives not just for the customer but also for the workforce.
Going for either a window type or a portable type air conditioner will still require you an outside exhaust, as a portable AC requires a hose or two while a window type AC is usually mounted with its back side outdoors. While both of them need to be stationed in one place in a room, portable ACs have the capability to be moved from the living room to the guest room to the bedroom and others.
For a room, you may be more satisfied with just a simple window type air conditioner. However, if you have a large room or multiple rooms at home to cool down, you might want to consider a centralized air conditioner as well, especially if you have the budget for it. Window units are more economical if you just need to cool down one room but if you like an even temperature in the whole house then centralized ACs are good.

How We Picked

If you want to have the best room air conditioner, you can look for the following factors:
Coverage area: from 200 to 800 square feet, you can get a room air conditioner that best suits your needs. It is important that you measure your area so that you can get the best for your needs. A room air conditioner that is too small can be overworked if you place it in a large area so make sure it is just right for your room or area. Oftentimes, BTU rating has something to do with its coverage area.
EER or SEER: the average SEER of most room air conditioners are at least 13 and above. EER or energy efficiency ratio and SEER or seasonal energy efficiency ratio determine if a room air conditioner is energy efficient and can save you a lot when it comes to your electricity bill. A higher EER or SEER for a room air conditioner means that it is sufficient for savings in your household on your AC unit.
BTU: the BTU rating of a room air conditioner can be from 5,000 BTUs and above, depending on how large the room can be. If you go for a larger room for your room air conditioner then you can go for a higher BTU such as 10,000 BTUs or more. The BTU rating of a room air conditioner determines how strong it is and how fast it is in removing hot air and converting it into cold air.
Energy Star certified: make sure that the room air conditioner is Energy Star certified so that you can have more savings in the long run. This ensures that your room air conditioner is not only safe to use but can also bring about better budgeting when it comes down to your electric bill.
Heating capability: most room air conditioners may also be reversed to have a heating capacity, especially if you have a ductless or centralized AC unit. While most room air conditioners are window type or portable ones, some may even have the option to be converted into a heater for the winter season or the rainy days.
Air filter: the air filter of this room air conditioner should be easy to clean, mostly washable. Some room air conditioners use HEPA filters to trap dirt, dust, debris, pollen and allergens that may cause hay fever and the like. Having a good air filter for your room air conditioner is important so that it won’t harm your family’s health. Being easy to clean means that you can service it any time.
Type of air conditioner: you have a wide choice of room air conditioner types: portable, window type, centralized or ductless. Window type ones or through the wall room air conditioners are great for most rooms as well as portable ones that can be moved from room to room. Centralized and ductless room air conditioners are a little expensive, but can cool all rooms in just one go and ductless can fine tune your rooms for zone cooling.
Inverter technology: those room air conditioners with the latest inverter technology run significantly more efficiently than older brands due to the variable speed feature. This type of technology is often found in newer room air conditioners – not only in ductless types but also maybe in window, portable and centralized types of AC units.
Dehumidifier: most room air conditioners will have a dehumidifier, which can be very helpful if you live in a really sticky or humid environment or if your summer is very humid. A dehumidifier for a room air conditioner helps to remove the sticky feeling as it cools down, so it is more effective than a regular fan in terms of cooling.

Our Pick

Our best room air conditioner is the Haier HWE12XCR 12000-BTU Room Air Conditioner which comes with 3 fan speeds that are selectable for your needs. It can be used in the kitchen and can be a great energy saver for small homes.
It comes with a fan mode and is rated at 11.3 EER which is good enough for small to medium rooms. It has a unit-stored magnetic remote control so you won’t misplace it. Covering up to 550 sq. ft of area, this room air conditioner can cool down any room easily at 12,000 BTUs of power.
The room air conditioner has an easy temperature readout to help you decide the best temperature for your room. You can also dehumidify with the dehumidifier setting on this room air conditioner. It can fit even a very wide window and has an easy to use digital display.
Great for any window-mounted installation, the room air conditioner comes with sturdy inside fan louvers as well. The room air conditioner is not loud at all and has a total of 4 functions for you to choose from. There is Braille on the remote for the visually impaired for accessibility. It has stable compressor cycles and works on 115V systems.

save energy while cooling

Flaws but Not Dealbrakers

While not a deal breaker, the Haier HWE12XCR 12000-BTU Room Air Conditioner can be slightly louder than expensive models, but it is not really a noise that can disturb your sleep anyway, and is still an efficient cooling unit for the price.

Step-up Pick

The Honeywell MN12CESBB 12,000 BTU Air Conditioner is our step-up pick with no bucket to empty for added conveniences. Usually, room air conditioners that are portable are quite pricey but can be transferred the second floor and back to the first floor whenever you need it.
Sturdy even after prolonged continuous operation, this portable air conditioner has a sleek design so it fits most homes and its durability can stand for many seasons to come. The room air conditioner can take up to 69 pints of dehumidification so it is great for keeping the air less humid.
It easily cools areas and is very easy to set up as a portable AC unit. With easy mobility due to the wheels or casters, the room air conditioner even has a fan-only function for saving up on energy costs. It can cover up to 450 sq. ft. of area and is easy to set up with the included remote control.
Being a simple to operate room air conditioner, there is a 5-inch diameter for the hose, which is made of durable plastic. It has a no-drip design so it does not create a mess in your household. Only 2 AAA batteries are required for the remote control.
With no permanent installation at all, this handy room air conditioner can be a great addition to any home with its auto evaporation system. Its included kit for the window vent can be removed easily when the unit is not in use.

Budget Pick

Our budget pick is the GE AHM05LW 5500-BTU Room Air Conditioner which is an Energy Star certified unit that runs quietly, making it great for a bedroom and similar rooms. It is rated for 115 volt systems and is sufficient for a small room.
Being an easy to install room air conditioner, it is powered at 5,500 BTUs so it is just right for a small room at the lowest price. Its lowest temperature is 64 degrees Fahrenheit, which is much like on most air conditioners out there.
With the power of this room air conditioner, you can be able to cool the porch off too. This unit cools a single room just fine because of its compact design yet good power that won’t easily suffocate you with coldness. It can be easily installed onto any typical double-hung window and is backed by 2 years of warranty for your convenience.

Best Room Air Conditioner that is a Window Type

If you want a window type room air conditioner, you can go for the Koldfront 10,000 BTU Window Air Conditioner which has a dehumidifying function and packs an eco-friendly operation to reduce the costs on your electric bill. It is powered up to 10,000 BTUs and is an Energy Star rated unit to save energy.
Running on 115 V/60 Hz (7.5 amps) systems, the room air conditioner can be used on study rooms and has a useful energy saver mode. With a total of 3 separate fan speeds to save up on electricity, it has a dehumidifier that works for highly humid summers.
It has a 24-hour timer for your needs and you can easily customizable settings due to the included remote control. It has an LED filter alert so you know when to change or clean up your filter. It is efficient at cooling your house and can be placed on bedrooms as well.
Covering up to 450 sq ft, the room air conditioner can be used for its auto functions for easy cooling. It has 10-minute intervals for its sleep mode and it is great for living rooms as well. With a temperature range of 62° to 86°F, the room air conditioner has a window size that is fairly at 15 1/2 x 23 to 36 inches. What’s more, its remote operation can be operated for up to 16 feet away.

Best Room Air Conditioner that is a Mini Desktop Type

The YOUDirect Mini Air Conditioner 9.5 inch is a nice and small energy-saving room air conditioner with up to 3 modes for fan speed. It can be a great supplementary AC when working on your office as a small air conditioner and only consumes 24 watts of power.
It is easy to carry and move and can be easily used and turned on when you are feeling hot and need some cooling during the summer. As a 9.5 inch unit, this cute mini air conditioner can be a great gift for someone and can be used wherever you need it.
With less than 68 dB of noise level, the room air conditioner brings about high efficiency cooling and can be placed on your office desk. It is extremely quiet and can process up to 70 mL per hour. It is also great for its air purification feature and can be placed on top of a bedroom dresser.
Bearing low energy consumption, the room air conditioner can even be used on a living room to help keep you cool during the summer or while sleeping. The room air conditioner has a lifetime limited product warranty to back it up.

Best Room Air Conditioner that is a Portable Type

The Frigidaire 8,000 BTUPortable Air Conditioner is a decent portable room air conditioner that cools on your schedule due to its settings. The auto-swing louvers helps to circulate the air far better than other models. For your needs in summer days and nights, this AC can cool from room to room.
Packing at up to 8,000 BTUs, this is a quiet unit that can be placed in a window for your additional convenience. The room air conditioner has a total of 3 fan speeds to choose from. As a portable air conditioner, you can remain comfortable even at wild temperatures as it can blow the cold air conveniently and evenly.
Giving you a better air distribution, this room air conditioner is packed with wheels or casters so you can cool one room after the other. In fact, this type of AC can be applicable in a pop-up camper as well. It has a 24-hour on/off timer for sleeping and it is great for California weather as well (hot summers).
It can help to circulate air better from room to room and it has an easy to install exhaust assembly along with the window venting kit. With a total of 3 cooling speeds to save up on energy, the room air conditioner can cover up to 350 sq. ft. of area.
The unit is a convenient and powerful room air conditioner that gives you a quick and easy setup overall with enough cooling flexibility. It has a dehumidification process of up to 2.2 pints per hour and it also restarts automatically after a power failure.

Best Room Air Conditioner with Mechanical Controls

The TCL 5,000 BTU Window-Mounted Air Conditioner is equipped with mechanical controls for those who like it traditionally and a no-fuss operation. With 4-way directional louvers for better air circulation, it is very quiet as a room air conditioner that can easily direct the air depending on your needs.
With a total of 2 fan speeds to choose from, it is usable on any 110 to 120V electrical outlet. Bearing a strong air flow, the room air conditioner can give you a dehumidification process of up to 1.37 pints per hour. Installation is relatively easy with this room AC because of the included window mounting kit.
With easy to use mechanical rotary controls, especially for older folks, it is user-friendly in general. It has a standard 3-prong grounded plug that is easy to connect. Its air filter is removable and washable so it is easy to service with a quick and easy setup.
At 5,000 BTUs of power, it is just right for most rooms and is easy to control with the included remote and timer. With a total of 2 cooling speeds to choose from, the room air conditioner is easily setup using your typical window-mounted installation method.
Including a 5.9-foot power cord, the room air conditioner is very user friendly overall and can cover small rooms up to 150 sq. ft. due to its ample size.

Best Room Air Conditioner for a Casement Window

The Global Industrial Casement Window Air Conditioner fits casement windows as a room air conditioner that comes ready to setup with an installation kit. It uses R410A, which is an eco-friendly refrigerant and it easily cools up to 450 square feet of area.
Being a UL certified room air conditioner, it works on most 115-volt systems and has a 24-hour on/off timer that can be used when you’re away. It has a washable filter that makes it easy to maintain overall. At 10,000 BTUs of power, this room air conditioner has sufficient cooling settings for most rooms.
With an auto restart feature after a power failure, it also has multiple fan settings to suit your cooling needs with the use of the remote control. It also has a sleep mode so you can feel assured that it won’t consume too much energy when you use this room air conditioner when you sleep. It is backed by a warranty of 1 year for parts and labor and 5 years for the sealed system

Best Room Air Conditioner with Electronic Controls

The SPT WA-1222S 12,000BTU Window Air Conditioner is an electronically controlled room air conditioner that has been Energy Star rated for the best in electrical savings. It can fit most vertical opening windows due to its design and has a clear and easy to see digital display.
With a total of 3 fan speeds to customize your cooling needs, its included window mount is flexible for various home designs. With user-friendly controls, this room air conditioner also comes with odor removal properties to keep the air fresh.
It has an energy saver mode and consumes a fair amount of 1092 watts (9.5 amps) for a single room unit. It has a filter change reminder so you don’t have to disassemble the unit to find out if you need to clean the filter. With intuitive electronic controls, it also has an auto restart feature and memory recovery from power outages.
With a sleep mode to keep it low on consumption at night, it has an easy to service washable air filter and flexible 4-way directional louvers for more air circulation. Ideal for rooms from 450 to 550 sq. ft. of area, it has a 24-hour timer setting as well for scheduling.
Rated at 115 volts 60 Hz, the room air conditioner comes with the environment-friendly R410A refrigerant. It has a top air discharge as well and is powerful at up to 12,000 BTUs and can be thermostat controlled.
With an automatic mode for easy cooling, the window installation kit that comes along with it is packaging. It has a fresh air vent design as well and can be set from 62 to 86°F for its temperature range. The room air conditioner is made with UL approved parts and has good air circulation overall.

Best Room Air Conditioner for Any Room in the House

If you want a room air conditioner that fits any room in the house, you can try the Keystone KSTAW10B 10,000 BTU Air Conditioner, which is rated at 11.3 EER, so it is sufficiently energy efficient. With intuitive electronic controls, this powerful room AC unit can cover up to 450 sq. ft. of area on the average.
It allows you with select options for your cooling needs and is powerful at 10,000 BTUs. Including a 6-foot power cord for easy plugging, there is also a handy check filter alert to easily clean the filter whenever you need it.
Any kind of cooling setup can be attained with the touch of a button of this room air conditioner. It is ready for any window-mounted installation and has a total of 3 fan speeds to choose from. It can take up to 2.3 pints per hour of dehumidification from your indoor air and has 3 cooling speeds.
Working on any 115-volt electrical outlet, the room air conditioner has up to 285 CFM on its fan consumption so it is pretty powerful. What’s more, the intuitive LED screen display makes it easy to view your settings and program the room air conditioner as you like it.
The unit also has a sleep mode to gain more savings at night with your AC unit. It is easily programmable so you can have a scheduled and flexible cooling pattern for your house all day and all year round. With an adjustable air flow direction, the room air conditioner is useful for its 24-hour timer for a just-right cooling experience. It also won’t disturb your sleep that much at less than 60 dB of noise levels.

The Competition

Other room air conditioners did not get included in our list because they have a low EER/SEER and a low BTU rating. They are also a hassle to install even with an HVAC personnel so we did not put them here. It is important for any room air conditioner to be convenient to install and should save a lot of money in the long run in terms of monthly electric bill expenses.

Other Frequently Asked Questions

Q: What are the different kinds of air conditioners out there?
A: There are many air conditioner types to choose from.
The most common one is the window type air conditioner, which is installed with a hole in the wall or in the window. You need ample space in your home before you go for the window type air conditioner.
The next one is the portable air conditioner, which can be great for those without enough space to drill a hole in the wall for a window type air conditioner. Portable ACs can be moved from one room to another but may require a hose to vent out.
Central air conditioners make use of two units: the indoor and the outdoor unit, to transfer the cooling to the rest of the house with the use of air ducts. These systems can be expensive.
Ductless or mini split air conditioners are great for zone cooling or heating and work like central ACs but do not use air ducts in installation.
Packaged air conditioners are an all-in-one unit that are mostly for commercial purposes.
Q: Why should I put air conditioning to my room or house?
A: The air conditioner can have physical as well as psychological benefits. It can improve the mood of a person when they are working, reading, using the computer or sleeping. You also get a better air quality indoors if you put air conditioning to each of the rooms. Air conditioning is great for those with asthma and allergies as well.
Most people who go for an air conditioner can also receive benefits of cooling down during the summer, especially for seniors or those who are prone to heatstroke. Many people can potentially die of heatstroke and if your house is not properly ventilated, it can lead to serious health problems. Air conditioning can be a life saver during the summer season.
Q: Which health problems can be cured with an air conditioner?
A: The air conditioner can help reduce allergens in the air, as well as many other airborne viruses and pathogens. In this case, air conditioners are widely accept as a good environment for those with asthma, sinus or other respiratory conditions. People who are prone to allergies (e.g. allergic rhinitis or hay fever) can help reduce the symptoms when they reside or work in an air conditioned environment more often.
Air conditioners can also be great for people who tend to have traumatic disorders, anxiety, depression and other mental health problems, as the cool air can help them calm down. Being all sweaty and hot can have a negative impact to a person’s mood, and this is why most hospitals and mental health facilities are fully air conditioned to help patients recover better.
Q: What makes the window air conditioner the most common AC unit for a room?
A: The window type air conditioner is usually the cheapest to buy from all AC units out there. A typical window type air conditioner can keep a single room cool and comfortable with a low cost, depending on the brand. They are also available on most common and popular brands out there.
Window type air conditioners are not just cheap but are also energy efficient, especially if they have a good EER of at least 10 or more. This signifies that they are not only eco-friendly but also good for your electric bill and your budget due to the lower initial cost compared to other AC unit systems. They are also good for lessening the load of a centralized AC system, if your home has one.
Q: What drawbacks should I watch for when using an air conditioner?
A: If you have an air conditioner then make sure you clean up the air filter regularly or as indicated by the user’s manual or the recommendation of the manufacturer. Bacteria, mold and the like can infest your air conditioner and harm the air quality of your indoor air instead of improving it.
Q: Aside from homes, which businesses require an air conditioner?
A: Nearly any business , especially shopping malls, grocery stores and even gymnasiums will require an air conditioner to help ventilate the area. Most of these business establishments will have closed areas so you need a good air conditioner to help cool down the whole business area or just a room, part or zone.
An air conditioning unit is typically needed for grocery stores and stock rooms because of the threat of perishable goods, such as fresh produce and other wet market goods. Spas and beauty centers should also have an air conditioner to make it comfortable for the customer, as well as shopping malls, to make it convenient for them when they shop.
Q: Which is better: a window type AC or a portable AC?
A: A window type AC depends on a hole in your window to work and can only be mounted once. On the other hand, portable ACs can be moved around even if they do require a hose to be vented outside for the excess water. Portable ACs are the best if you want to move the air conditioner from room to room. Window type ACs are the best if you just ideally want an AC in one room.
Q: Which is more economical: a window type air conditioner or a centralized air conditioner system?
A: Choosing between a window type versus a central type can be tough, especially if you have a medium to large sized house. Central types can be expensive in comparison to window types, but they can be more effective and efficient in cooling because they can cool down the whole house instead of just one room, in comparison to the window type air conditioner.
Q: How is a ductless AC different from a central AC?
A: The ductless and the central air conditioners have a difference that comes down to the duct work. Ductless systems do not require duct work but central air conditioners do. Also with a ductless system, you can select which rooms to cool down or heat up and which rooms stay the same. This is something that you cannot do on a central air conditioner system.
If you own a central air conditioner, it can be a hassle because you have to do some duct work or else it will not distribute air throughout the house. Central ACs also cool the whole house but not specific rooms. If you want specific zone cooling or room cooling then you should go for a ductless air conditioner instead of a centralized one.
Q: What is the best noise level of an air conditioner to help me sleep better?
A: An air conditioner with about 40 to 60 dB will be a good noise level to consider (in maximum) when pertaining to its motor noise. This will help you sleep better at night due to the low ambient noise.
Some air conditioners have a sleep mode, which lowers the temperature impact of the unit and also its motor noise. It is important for any AC unit to have a good noise level without disturbing your sleep and without compromising on your electric bill and its cooling ability overall.
Q: Are split system or ductless air conditioners okay to install in bedrooms?
A: Yes, ductless or split system air conditioners are totally applicable in bedrooms and in room air conditioning. While most of them can be big and an eyesore to your home’s aesthetics, there are smaller variants that look good and won’t interfere with your room’s design. In fact, zone cooling is one of the key benefits of ductless systems.
Q: What consequence can happen if I don’t select the right BTU of air conditioner for my room or area?
A: The BTU rating of an air conditioner is important to know about because it will dictate just how much cooling power it can give to your room. Having a BTU size that is too large can mean that it will cycle faster and skip the humidity, so the result is still a sticky feeling indoors. If the BTU rating is too small, it will not cool down your indoor area effectively.
Q: Is EER the same as SEER?
A: EER and SEER are both energy ratings that pertain to the energy efficiency of an air conditioner. However, SEER is for seasonal use and can be based on varying temperatures instead of just one with the EER. SEER is mostly seen in medium to large scale (usually commercial type) air conditioners that have a heating option or a heat pump along with it (e.g. centralized or ductless).

Energy Rating	Minimum Requirement	Best For
EER	At least 10	Small scale ACs
SEER	At least 12	Medium to large ACs with heating option

Q: Can air conditioners also become heaters?
A: Yes, a large number of AC units can have a reverse option for heating. This removes the hassle of having to buy an additional heater in the house during the winter. Having an air conditioner with a heater option can help you stay temperate all year round in your room or house.
Q: Why should I regularly check and clean my AC unit outside?
A: Most air conditioners will have an outside part (or at least half of it for window type and some portable types). The outside part should be cleaned and maintain to avoid the debris getting stuck and causing problems for the AC unit. It should be clear of falling debris from your tree or plants.
Q: Why should I change my air filter regularly on an air conditioner?
A: The regular changing of an air conditioner air filter is needed so that your AC unit runs smoothly all the time. It also won’t cause viruses and airborne germs to stay in the air because it is new and thoroughly clean. If it is washable, you can also clean it.
Q: Can a programmable thermostat give you more energy savings?
A: Yes, programmable thermostats that are installed on any air conditioner unit can help you save up on energy costs. Setting the temperature automatically when you leave the house or when you go to sleep at night will help to cut down on cooling (or heating) costs in the long run. It is also very helpful in case the weather outside is unstable and you need the right temperature for your room or house.
Q: Why should I keep my air conditioner fins in tip top shape?
A: Maintaining the air conditioner fins will do something good for your unit’s durability and longevity. The fins can be straightened out with a kitchen knife or a fin comb and this will help the ventilation fins to work as greatly as possible to cool down your room or area.
Q: Why don’t air conditioners use CFC anymore?
A: CFC or chlorofluorocarbons are harmful for the ozone layer and is a major cause of global warming, which is bad for the environment. More eco-friendly alternatives for refrigerants have been created today to help power up air conditioners without risking the environment at all.
Q: If my air conditioner is running but not cooling, what could be the problem?
A: The air filter might have been blocked by some formation of ice. You can easily fix this by turning on the fan mode of the air conditioner if you see upon your inspection that the air filter has been blocked with ice crystals on the coils.

Wrapping It Up

Overall, we think that the Haier HWE12XCR 12000-BTU Room Air Conditioner is our best room air conditioner due to its 3 fan speeds, 11.3 EER and up to 550 square feet of area coverage.