AC Product Database

LG LT1016CER

The LG LT1016CER is the best on-the-wall air conditioner I've used.

Despite its specification for a maximum cooling area of 450 square feet with its 10000 BTU cooling capacity, I was thoroughly impressed when it efficiently cooled my 600-square-foot living area from 82°F down to a comfortable 68°F in just about 30 minutes.

My customers all report that the user interface is easy to use. Options include cooling, fan-only, dehumidifying modes, three fan speeds, a programmable timer, and an energy-saving mode. 

One feature I was concerned with was the lack of a sleep mode. The unit operates at 65 dB at its highest setting, which personally never wakes me from a nap.

However, if you're noise-sensitive, keep this in mind, and you might consider the Frigidaire FHTC123WA1 instead.

In my opinion, this AC is easy to use. Just plug it into a standard 115V outlet, and it will go to work without causing a spike in your electricity bill. 

I love that the remote control is equipped with an integrated thermostat.

This smart feature actively monitors the ambient temperature and adjusts the air conditioner accordingly, which I found incredibly convenient.

It maintains a consistent indoor climate without constant manual adjustments.

I also have to give a shout-out to LG for channeling the power cord through the unit rather than dangling it loosely. This is a very thoughtful feature that helps prevent wear and tear over time.

Despite the poor installation instructions, the installation was a breeze compared to other units I've wrestled with.

The indoor installation is polished off with a snap-together trim kit made of durable plastic and a protective mesh grille that doesn't detract from your home's aesthetic — it's a subtle but significant touch that I really appreciate.

In my opinion, if you’re looking for a reliable, efficient, and user-friendly air conditioner, the LG LT1016CER should be your top choice.

Related article: Window ACs with 10000 BTU cooling power

Keystone KSTAT14-2C

The Keystone KSTAT14-2C is the powerhouse of through-the-wall air conditioners, making it my top recommendation for larger spaces up to 700 square feet.

With 14,000 BTUs of cooling power, this unit handled a brutal summer heatwave with ease, quickly dropping the temperature in my oversized den from 85°F to 70°F in just 40 minutes—no small feat for a room with high ceilings and west-facing windows.

If you need more coverage than what the LG LT1016CER offers, this is the upgrade to consider.

Now, one thing to note: this unit requires a 230-volt outlet rather than a standard 115V one. That means you’ll likely need to hire an electrician to install the proper outlet, so be sure to factor in that extra cost.

Keystone did a great job designing a simple, intuitive interface. It includes cooling, fan-only, and dehumidifying modes, along with three fan speeds and a programmable timer.

 The remote control is a standout—it features a built-in thermostat that actively senses the room’s temperature and adjusts the unit accordingly, so you’re not constantly fiddling with settings.

Noise-wise, it runs at about 61 dB, which is quieter than some competitors, though you’ll still hear it running if you’re noise-sensitive.

These through the wall models are louder than the quietest window air conditioners, but you do have the added benefit of the wall sleeve buffering some of that noise. 

For those who need heating, Keystone also offers this model with supplemental heating for about $130 more. 

Just keep in mind that "supplemental" means it works in addition to your primary heating system—it won’t replace a dedicated heater in cold winters.

Installation was straightforward, though, like many AC units, the instructions could be better. The included trim kit snaps together easily for a polished, built-in look, and the protective grille ensures durability without being an eyesore.

If you need serious cooling power for larger rooms and are willing to set up a 230V outlet, the Keystone KSTAT14-2C is a fantastic investment. It’s efficient, powerful, and packed with smart features that make home cooling effortless.

Related article: Recommended 14000 BTU air conditioners 

Frigidaire FHTC123WA1

I recently installed the Frigidaire FHTC123WA1 in my master bedroom, and it has been an absolute game-changer for both comfort and convenience.

This unit is specifically designed for medium-sized rooms, ideally ranging from 450 to 550 square feet, and it fits perfectly in my space.

One of the standout features of the Frigidaire FHTC123WA1 is its Automatic Remote Temperature Control. 

While the Keystone KSTAT10-2C and the Cooper&Hunter model also offer remote control functionality, the Frigidaire FHTC123WA1's automatic remote temperature control is specifically designed to adjust the cooling based on ambient room temperature. 

This feature helps the unit maintain a consistent temperature without me manually adjusting the settings frequently.

It's especially handy during the nights or while I'm away from home, as it adjusts based on the ambient temperature to keep the room comfortably cool. 

The programmable timer is another feature I love using.

I have it set to cool the room about 30 minutes before I go to sleep, which ensures the room is at the perfect temperature by the time I'm ready to tuck in. 

This helps with energy efficiency but also means I'm always stepping into a perfectly cooled room.

Unlike the LG LT1016CER, the Frigidaire FHTC123WA1 has a sleeping mode.

This feature reduces the compressor speed and fan noise, making nice, soothing white noise, perfect for light sleepers.

For reference, on low, it's 57 dB, and sleep mode is much quieter. 

I recommended this unit to several of my customers who are noise-sensitive, and they say there's been a significant improvement in their sleep quality since they started using this model. 

I also have to mention the easy-to-clean washable dust filter, which makes maintenance a breeze.

It's simple to remove, wash, and replace and ensures that the air quality in my bedroom stays high and the unit runs efficiently. 

Overall, my experience with the Frigidaire FHTC123WA1 has been overwhelmingly positive.

It's an excellent air conditioner that combines efficiency, convenience, and comfort.

The features like the programmable timer, sleeping mode, and automatic temperature control have genuinely made a daily difference in how I enjoy my home.

Keystone KSTAT10-2C

I recently upgraded my client’s studio condo with the Keystone KSTAT10-2C wall-mounted air conditioner, and he reports the experience has been nothing short of transformative.

In my opinion, the installation process is straightforward, thanks to the Keystone's compatibility with the universal 24” sleeve.

I was able to use the existing sleeve as I was replacing an older model, which was a huge relief.

The unit is relatively lightweight and is easier to handle during setup compared to the Friedrich Wallmaster WCT12A10A.

Moreover, the clear and detailed instructions provided in the manual facilitated a smooth installation. I could get the unit up and running without any hassle.

In terms of performance, the Keystone KSTAT10-2C cools areas up to 450 square feet and quickly reduces temperatures from 92°F to 75°F in about an hour.

It has three cooling modes, three fan speeds, and 4-way adjustable air louvers, which are especially effective in directing airflow precisely where needed.

The programmable timer is another handy addition. I have many older customers who ask me to set cooling schedules to match their daily routine, which is a great energy saver.

The built-in dehumidification feature removes 2.1 pints of moisture per hour and enhances comfort.

While this AC isn't a replacement for a whole house dehumidifier, I can report that this AC maintains optimal humidity levels, especially during moderately humid days.

The smart remote control with a portable thermostat automatically adjusts settings based on real-time temperature readings. I love how this ensures consistent cooling without me having to intervene manually.

In my opinion, energy efficiency is another strong suit of this model. With a 10.6 EER rating and Energy Star certification, the Keystone operates economically.

The energy-saving mode minimizes power consumption and maintains comfort.

The sleep mode reduces cooling intensity overnight, which helps reduce electricity bills without sacrificing nighttime comfort.

Overall, my experience with the Keystone KSTAT10-2C has been highly positive.

It combines powerful cooling capabilities with thoughtful, energy-efficient features, all wrapped up in an easy-to-install package.

Cooper&Hunter CH-PTW-09HPGF

In my opinion, one of the most compelling advantages of the Cooper&Hunter unit is its efficiency and its warranty coverage.

It offers an impressive 7-year limited warranty on the compressor and a 5-year limited warranty on parts.

This extended warranty period provides extra peace of mind and assurance of the durability and reliability of the unit.

The other very important advantage of this unit is that it is one of the most efficient AC models in its category at 11.4 EER rating. Higher the efficiency, the lower the running. 

Another feature of Copper & Hunter that I love using is their Remote WiFi app, which allows you to control the air conditioner from anywhere. Who doesn’t love coming home that’s pleasantly cooled down in the middle of summer? 

Whether I’m at work or on my way home, I can adjust settings from my smartphone, which isn’t a common feature among most traditional wall-mounted units, including the ones my top choice of the LG model.

Unlike the previous models on this list that only offer cooling, the Cooper&Hunter air conditioner also has heating capabilities. This dual functionality makes it an excellent choice for year-round climate control.

You won’t need separate heating and cooling systems. 

I also believe that this feature is especially beneficial in regions with variable temperatures, where both heating and cooling are necessary throughout the year. 

In terms of installations, a wall sleeve and an exterior grille are required, which aren't included and must be purchased separately.

This adds to the initial cost and installation effort but is typical for through-the-wall air conditioners intended for secure and lasting installation. 

Overall, I recommend the Cooper&Hunter air conditioner for its dual heating and cooling options and excellent warranty terms that set it apart from others on the list.

Its ability to both cool and heat, combined with the convenience of app-based controls, makes it a great option for year-round climate control.

Related article: Top-rated window ACs with WiFi controls

Friedrich Wallmaster WCT12A10A

The Friedrich Wallmaster WCT12A10A is a top-notch in-wall air conditioner that earns its place my list.

I've integrated it into my smart home setup, and I've been more than happy with the decision. 

With a cooling capacity of 12,000 BTU, the Wallmaster efficiently handles spaces up to 550 square feet, ideal for medium to large rooms.

It cools areas quickly and maintains a comfortable environment even in slightly larger spaces than its rating suggests. In my opinion, this AC provides significant relief during hot months. 

I didn’t have any issues with the installation, which is similar to the Cooper & Hunter models.

The process is straightforward. The unit is designed to fit 27-inch sleeves and mount flush with exterior walls, perfect for thicker wall installations.

This setup is easy, though the unit is heavy at 101 lbs. I had to get an extra pair of hands to tackle the installation safely. 

I believe that the latest smart home technology sets the Wallmaster apart. Connecting the unit to Wi-Fi and managing it via the FriedrichConnect app is a breeze.

I could make remote adjustments and monitor the unit through my smartphone, and I loved that it even supports voice commands via Alexa. 

In terms of energy efficiency, the Wallmaster impresses with a 10.5 EER rating. In my opinion, the power consumption is surprisingly low, making it an economical choice without sacrificing performance. 

Several of my clients have said they thought the controls were complex initially, but they loved that there are plenty of settings that allow for precise climate control.

I've also appreciated the temperature limiter setting, which helps maintain a consistent temperature by setting upper and lower limits.

I recommend the Friedrich Wallmaster WCT12A10A to anyone looking for a powerful, efficient, smart wall-mounted air conditioner.

It's an excellent choice that promises convenience and reliability, integrating seamlessly into the modern home. 

Whirlpool WHAT081-1AW

If you’re after a quiet, efficient, and well-built through-the-wall air conditioner for smaller rooms, this Whirlpool model is a solid pick. It’s easy to use, doesn’t spike your power bill, and comes from a brand known for reliability.

The 8000 BTU doesn't have an option with heat, but their 10000 BTU model does. 

Related article: 8000 BTU air conditioners compared

Keystone KSTHW18B

The Keystone KSTHW18B is a powerhouse for extra-large spaces, making it my top recommendation for rooms up to 1,000 square feet.

If you're cooling a mid-sized space, I’d still point you toward the Keystone KSTAT14-2C with its 14,000 BTUs, but for those needing serious cooling power, this 18,800 BTU model is the way to go.

It’s built for through-the-wall installation, but one of the things I really appreciate is that it can also be used as a window unit. 

This is particularly useful if you're buying it as an emergency cooling solution during a brutal heatwave—you can run it as a window AC while prepping your wall for a permanent install.

I recently helped install this unit in an old brick building that had been converted into a boutique.

The owner wanted to keep the space cool for customers but didn't want to commit to cutting through the wall until she was sure it would work for the layout. We set it up in a window first, and it made an immediate difference—keeping the shop cool and comfortable, even with the doors opening all day.

Once she was happy with the placement, we moved forward with the wall installation, and now it blends in seamlessly.

In addition to its cooling power, this model comes with built-in supplemental heating, making it a versatile year-round option. 

Of course, as with all supplemental heaters, this is meant to work alongside another heat source, not replace your main heating system in colder climates.

The remote control features a built-in thermostat, so the AC adjusts to the temperature where you are, rather than just at the unit. It runs on a 230V connection, so you’ll likely need to hire an electrician if you don’t already have the proper outlet.

Installation is straightforward, and Keystone includes a trim kit for a clean built-in look. If you need powerful, flexible cooling for an extra-large space, this model is a smart investment.

Are window and wall air conditioners the same?

Wall and window air conditioners are not the same, and wall air conditioners can’t be installed in a window space. However, a window air conditioner with a slide-out chassis can often be used in a through-wall installation.

Related article: Window AC versus wall ACs compared

How much does a through-the-wall AC unit cost?

Through-the-wall air conditioners generally cost upwards of $400. Some wall AC units can cost more than $1,000, depending on their features, capability, and brand.

How much power does a through-the-wall air conditioner need?

A through-wall air conditioner typically needs 750-1,500 watts of power. Due to the high variability, check your unit’s energy consumption before purchasing to avoid unpleasant surprises.

How long do through-the-wall air conditioners last?

Through-the-wall air conditioners typically last around 5-10 years. However, it’s not unusual to get several decades of service out of a good unit with regular maintenance.

Can a window AC be used through-the-wall?

It can be possible to install window ACs in a through-the-wall configuration. A smaller window AC will fit into a wall sleeve with some padding, while window models with a slide-out chassis sleeve are designed for alternative through-wall installation. Follow the manufacturer's instructions.

Are through-the-wall air conditioners standard size?

There's no single-size standard for through-wall air conditioners. However, most wall AC units are designed to fit one of many available sleeve sizes.