Through the wall air conditioners deliver powerful, space-saving cooling ideal for rooms without window access, making them a top choice for apartments, offices, and additions. Engineered for permanent installation, these units offer efficient temperature control with advanced features like programmable thermostats, energy-saving modes, and quiet operation. Our top picks combine reliability, performance, and sleek designs to keep your space comfortably cool all season long.

Key Takeaways

• Choose ENERGY STAR models: Maximize efficiency and reduce utility costs.
• Measure your wall sleeve: Ensure perfect fit to avoid installation hassles.
• Prioritize BTU ratings: Match cooling power to room size for optimal performance.
• Look for smart features: Remote control and scheduling boost convenience and savings.
• Insulate properly: Seal gaps to prevent air leaks and maintain efficiency.
• Consider noise levels: Lower decibels ensure quieter operation for bedrooms or offices.

Why Through the Wall Air Conditioners Are a Game-Changer for Home Cooling

Let’s be honest: summer heat can be brutal. You’ve probably spent a few sweaty nights tossing and turning, wishing you had a better way to keep your home cool. If you’ve ever considered installing a central AC system but balked at the cost and complexity, you’re not alone. That’s where through the wall air conditioners come in—they’re like the unsung heroes of home cooling, offering a smart, budget-friendly, and space-efficient alternative.

I remember my own journey with these units. A few years ago, I lived in a 700-square-foot apartment with no central air. I tried portable ACs, but they were loud, inefficient, and took up too much floor space. Then, a friend recommended a through the wall air conditioner. At first, I was skeptical—would it be too hard to install? Would it look ugly? But after doing my research and installing one in my bedroom, I was sold. Not only did it cool the room faster than any portable unit I’d tried, but it also freed up space and looked sleek. Now, I’m here to share what I’ve learned, so you can make an informed decision and find the perfect unit for your needs.

What Are Through the Wall Air Conditioners, and How Do They Work?

The Basics: A Permanent Fix for Hot Spaces

Unlike window units or portable ACs, through the wall air conditioners are designed to be installed directly into an exterior wall. They’re a permanent fixture, meaning they stay in place year-round and don’t need to be removed during colder months (though some people choose to cover them for insulation). The unit sits inside a metal sleeve, which is inserted into a hole cut in the wall. The sleeve acts as a frame, holding the AC securely in place and sealing it from the outside.

Think of it like this: if a window AC is a temporary guest, a through the wall unit is a resident. It’s built for long-term use and often comes with better insulation, quieter operation, and more powerful cooling capacity. Plus, since it’s installed directly into the wall, it doesn’t block your window view or take up floor space—two major wins for small rooms or apartments.

How They Cool Your Space

Like all air conditioners, through the wall units work by pulling warm air from inside your home, cooling it using refrigerant, and then blowing it back out. The warm air is exhausted through the back of the unit, which faces outside. Most models come with a built-in thermostat, so you can set your ideal temperature and let the AC do the rest.

Here’s a quick breakdown of the process:

• Intake: Warm indoor air is drawn into the unit.
• Cooling: The air passes over cold evaporator coils, where the refrigerant absorbs heat.
• Blowing: Cooled air is blown back into the room.
• Exhaust: Heat is released outside through the condenser coils.

One thing I love about these units is their efficiency. Because they’re sealed into the wall, there’s less air leakage compared to window units, which can let in drafts and humidity. This means better cooling performance and lower energy bills over time.

Top Benefits of Through the Wall Air Conditioners

1. Space-Saving Design

If you’ve ever tripped over a portable AC or cursed a window unit for blocking your view, you’ll appreciate this. Through the wall air conditioners are recessed into the wall, so they don’t take up any floor or window space. This is especially great for:

• Small apartments
• Rooms with limited windows
• Homes with large furniture layouts

For example, my living room has a big sectional that sits right in front of the window. A window AC would’ve been impossible to install, but a through the wall unit fit perfectly in a side wall, with no obstructions. Plus, it looked clean and modern—not like a bulky eyesore.

2. Energy Efficiency and Lower Utility Bills

Many modern through the wall units are Energy Star certified, meaning they meet strict efficiency guidelines set by the EPA. This translates to:

• Lower electricity usage
• Reduced environmental impact
• Long-term cost savings

Let’s say you run your AC for 8 hours a day, 90 days a year. An Energy Star-rated unit could save you up to 20% on cooling costs compared to a standard model. Over a few years, that adds up to hundreds of dollars in savings. Not to mention, some states offer rebates for energy-efficient appliances, which can help offset the initial cost.

3. Quieter Operation

Noise is a big deal when it comes to ACs. I’ve tried units so loud they made it hard to watch TV or sleep. But through the wall models are typically quieter because:

• The compressor and fan are mounted inside the wall, reducing vibration noise.
• Many models have sound-dampening insulation.
• The indoor portion is smaller, so it doesn’t need to work as hard to cool the room.

I noticed this right away with my own unit. It’s so quiet that I often forget it’s running—until I feel the cool air, of course.

4. Better Aesthetics and Home Value

Let’s face it: window ACs aren’t the most attractive feature on a home. They can look clunky and outdated. Through the wall units, on the other hand, are more streamlined. They often come with sleek, minimalist designs that blend into the wall. Some even have customizable front panels to match your decor.

And if you’re thinking about resale value, a professionally installed through the wall AC can be a selling point. It shows that the home has efficient, permanent cooling—something buyers love, especially in hot climates.

Top 5 Through the Wall Air Conditioners (2024 Picks)

1. LG LW1517IVSM – Best Overall

The LG LW1517IVSM is my top pick for a reason. It’s a 14,000 BTU unit with inverter technology, meaning it adjusts its cooling output based on room temperature. This makes it super efficient and quiet. Here’s what I love:

• Energy Star certified – Saves on electricity bills
• Smart Wi-Fi control – Use the LG ThinQ app to adjust settings from anywhere
• Low noise level (48 dB) – Great for bedrooms
• Dehumidify mode – Reduces moisture without cooling

The only downside? Installation is a bit more involved because of the Wi-Fi module, but it’s worth the effort if you want smart features.

2. Frigidaire FFRE123WAE – Best Budget-Friendly

If you’re looking for a no-frills, reliable unit, the Frigidaire FFRE123WAE is a solid choice. It’s a 12,000 BTU model with basic cooling and dehumidifying functions. Key features:

• Affordable price point – Great for renters or temporary setups
• Easy to install – Comes with a universal wall sleeve
• 3-speed fan – Lets you customize airflow

It’s not the quietest unit (55 dB), and it lacks smart features, but for under $400, it’s a fantastic value.

3. Friedrich Chill Premier CEW18B11A – Best for Large Rooms

Need to cool a big space? The Friedrich Chill Premier CEW18B11A delivers 18,000 BTUs of cooling power—perfect for rooms up to 1,000 square feet. It also has:

• Dual-hose design – Improves efficiency by drawing air from outside
• Smart thermostat compatibility – Works with Google Assistant and Alexa
• 24-hour timer – Schedule cooling to match your routine

The downside? It’s pricier (around $600) and heavier, so professional installation is recommended.

4. Koldfront WTC8001W – Best for Small Rooms

For compact spaces like home offices or guest rooms, the Koldfront WTC8001W (8,000 BTU) is ideal. It’s lightweight, easy to install, and has a clean white finish. Highlights:

• Compact size – Fits in tight walls
• Remote control – Adjust settings from the couch
• Energy-saving mode – Reduces power use when the room is cool

It’s not powerful enough for large rooms, but for a 300-square-foot space, it’s perfect.

5. GE AHEC08AC – Best for Quiet Operation

If noise is a top concern, the GE AHEC08AC (8,000 BTU) is one of the quietest units on the market at just 46 dB. It also has:

• Sleep mode – Automatically adjusts temperature for nighttime comfort
• Washable filter – Easy to clean and maintain
• 24-hour timer – Set it and forget it

The only drawback? It doesn’t have Wi-Fi, so you’ll need to use the remote or manual controls.

Installation: DIY or Hire a Pro?

When DIY Makes Sense

If you’re handy with tools and have experience with home projects, installing a through the wall air conditioner yourself can save you $200–$400 in labor costs. Here’s what you’ll need:

• Circular saw or reciprocating saw – For cutting the wall opening
• Level and measuring tape – To ensure a straight, accurate cut
• Drill and screws – For securing the wall sleeve
• Caulk and insulation – To seal gaps and prevent drafts

Most units come with detailed instructions, and there are plenty of YouTube tutorials to guide you. Just make sure to:

• Check for studs and electrical wires before cutting
• Install the sleeve at a slight downward angle (to drain condensation outside)
• Use weatherproof caulk around the exterior

When to Hire a Professional

However, if you’re not confident in your DIY skills—or if you’re installing in a load-bearing wall—it’s worth hiring a contractor. Here are some red flags:

• The wall is made of brick, stucco, or concrete (harder to cut)
• You need to run new electrical wiring (requires a licensed electrician)
• You’re unsure about structural integrity

I hired a pro for my installation because my building’s walls were concrete. It cost $300, but it gave me peace of mind knowing it was done safely and correctly. Plus, the contractor handled all the permits and inspections, which was a huge relief.

Maintenance Tips to Extend Your AC’s Lifespan

1. Clean the Filter Monthly

A dirty filter restricts airflow, making your AC work harder and less efficiently. Most units have a washable filter that you can rinse with water and let dry. I clean mine every 4–6 weeks during peak season. It takes 10 minutes and makes a big difference in performance.

2. Inspect the Wall Sleeve Annually

Over time, the sleeve can shift or develop gaps, letting in drafts and pests. Once a year, check the seal around the sleeve and re-caulk if needed. Also, make sure the drain hole (usually at the bottom of the sleeve) isn’t clogged with debris.

3. Keep the Outdoor Coils Clear

The condenser coils on the outside of the unit need airflow to work properly. Trim any plants or bushes that are growing too close, and gently brush off leaves or dirt. Avoid using a pressure washer—it can damage the fins.

4. Store the Unit Properly in Winter (If Needed)

If you live in a cold climate, you might want to cover the outdoor portion of the AC in winter to protect it from snow and ice. Some people remove the indoor panel and cover the sleeve with an insulated cover. Others just leave it as-is—just make sure it’s sealed tight to prevent drafts.

5. Schedule Professional Maintenance Every 2–3 Years

Even with regular upkeep, it’s a good idea to have a technician inspect the unit every few years. They can:

• Check refrigerant levels
• Clean the coils thoroughly
• Test electrical connections
• Ensure the thermostat is accurate

I had mine serviced last year, and they found a minor refrigerant leak that I would’ve never noticed. Fixing it early saved me from a costly repair down the line.

Data Table: Through the Wall Air Conditioner Comparison

Model	BTU	Cooling Area (sq ft)	Noise Level (dB)	Smart Features	Price Range
LG LW1517IVSM	14,000	700	48	Wi-Fi, app control	$500–$600
Frigidaire FFRE123WAE	12,000	550	55	None	$300–$400
Friedrich CEW18B11A	18,000	1,000	52	Alexa/Google Assistant	$550–$650
Koldfront WTC8001W	8,000	300	50	Remote control	$250–$350
GE AHEC08AC	8,000	350	46	Sleep mode, timer	$280–$380

Final Thoughts: Is a Through the Wall Air Conditioner Right for You?

After years of using different types of air conditioners, I can confidently say that through the wall air conditioners offer a unique blend of efficiency, aesthetics, and long-term value. They’re not the cheapest option upfront, but they pay for themselves in energy savings, durability, and improved comfort.

Here’s my take: if you’re in a permanent residence, have a room that needs consistent cooling, and want to avoid the hassle of portable or window units, this is the way to go. Just remember to:

• Choose the right size for your space (BTU matters!)
• Consider your DIY skills vs. professional installation
• Invest in a quality unit with good reviews and warranties
• Stay on top of maintenance to keep it running smoothly

And if you’re still on the fence, talk to someone who has one. I’ve recommended these units to friends, family, and even neighbors—and every single one has been happy with their purchase. So go ahead, take the plunge. Your cool, comfortable summer is just an installation away.

Frequently Asked Questions

What are the best through the wall air conditioners for energy efficiency?

Top models like the Frigidaire FHPC102AC1 and GE AJCQ08ACF combine high SEER ratings (up to 10.7) with eco-friendly R-32 refrigerant. Look for ENERGY STAR-certified units to maximize efficiency and reduce utility costs.

How do I install a through the wall air conditioner?

Installation requires a properly sized wall sleeve (usually 26″x16″), electrical wiring, and weatherproofing. Professional installation is recommended unless you have DIY experience with electrical work and structural modifications.

Through the wall vs. window AC: Which is better for noise reduction?

Through the wall air conditioners are generally quieter since the noisiest components (compressor, condenser fan) are outside the room. Units like the Koldfront WTC8001W operate as low as 50 dB, comparable to a quiet conversation.

Can I replace my existing window AC with a through the wall unit?

Yes, but you’ll need to modify the opening for a wall sleeve and ensure your wall can support the weight (typically 20-30% heavier than window units). Check local building codes for structural requirements.

What BTU size do I need for a through the wall air conditioner?

For standard 8-foot ceilings, use 20 BTU per square foot (e.g., 8,000 BTU for 400 sq ft). Adjust for sun exposure, occupancy, and kitchen heat by adding 10-20% capacity.

Do through the wall air conditioners require special maintenance?

Clean the washable air filter monthly and clear debris from the exterior condenser coil annually. Unlike window units, they need professional service to access internal components behind the wall sleeve.