Thru wall air conditioner units deliver powerful, efficient cooling without taking up window space, making them ideal for rooms where window units aren’t practical. Designed for permanent installation, these units offer quiet operation, better insulation, and a sleek, built-in look that enhances your home’s aesthetics. Whether you’re cooling a bedroom, office, or sunroom, the best thru wall ACs combine reliable performance with energy efficiency for lasting comfort.

Key Takeaways

• Choose the right size: Match BTU to room size for optimal cooling efficiency.
• Prioritize energy efficiency: Look for high EER or ENERGY STAR® certified models.
• Check noise levels: Select units under 60 dB for quiet operation.
• Verify wall sleeve compatibility: Ensure your existing sleeve fits the new unit.
• Opt for programmable features: Use timers and thermostats for better control.
• Professional installation matters: Improper setup reduces efficiency and lifespan.
• Maintain regularly: Clean filters monthly to boost performance and air quality.

Best Thru Wall Air Conditioner Units for Cool Comfort

It’s a sweltering summer afternoon. You’re curled up on the couch, fanning yourself with a magazine, dreaming of a cool breeze that never seems to come. Your window AC unit? Too noisy, too drafty, and it blocks half your view. You’ve considered central air, but the cost and installation hassle feel overwhelming. Sound familiar?

If you’re looking for a reliable, permanent cooling solution that doesn’t require tearing up your walls or breaking the bank, a thru wall air conditioner unit might be exactly what you need. These sleek, self-contained systems are designed to be installed directly into an exterior wall, offering efficient cooling without the clutter of window units or the complexity of ducted systems. Whether you’re cooling a single room, a studio apartment, or a sunroom, thru wall ACs deliver consistent comfort with minimal visual impact.

In this guide, we’ll walk you through everything you need to know about thru wall air conditioners—from how they work and why they’re a smart choice, to what to look for when buying one and how to install it properly. We’ll also share real-world tips and compare top models so you can make an informed decision. By the end, you’ll know whether a thru wall AC is right for your home—and which one might just be your new best friend during those hot, sticky months.

What Is a Thru Wall Air Conditioner?

A thru wall air conditioner is a type of room air conditioner that’s permanently installed through an exterior wall. Unlike window units that sit in a window frame and block light, or portable ACs that require venting through a hose, thru wall units are built to stay put. They’re self-contained, meaning all components—compressor, condenser, evaporator, and fan—are housed in a single unit that fits snugly into a wall opening.

How It Differs from Window and Portable Units

Let’s break it down: window ACs are affordable and easy to install, but they’re noisy, can be a security risk, and often don’t seal well, letting in drafts and humidity. Portable air conditioners are flexible and don’t require permanent installation, but they’re less efficient, take up floor space, and still need to vent hot air outside—usually through a window or wall.

Thru wall units, on the other hand, offer a middle ground. They’re more efficient than portables, quieter than many window models, and provide a clean, built-in look. Because they’re installed directly into the wall, they don’t obstruct windows or take up valuable floor space. Plus, they’re designed to handle the full heat load of a room without the energy loss that comes with improper sealing.

Ideal Use Cases

Thru wall air conditioners are perfect for homes without central air, apartments where window units aren’t allowed, or rooms where aesthetics matter—like bedrooms, home offices, or sunrooms. They’re also great for older homes with thick walls that make central air installation difficult. If you’re renting and can’t modify windows, or if you want a permanent solution that blends into your home’s design, a thru wall AC is a smart, long-term investment.

One homeowner in Phoenix, Arizona, shared how her thru wall unit transformed her sunroom: “Before, it was unusable from May to October. Now, I can enjoy my morning coffee in there even on 110-degree days. It’s quiet, efficient, and you’d never know it’s there unless you looked for it.”

Key Features to Look for in a Thru Wall Air Conditioner

Not all thru wall air conditioners are created equal. To get the best performance, comfort, and energy efficiency, it’s important to know what features matter most. Here’s what to keep an eye on when shopping.

Cooling Capacity (BTUs)

The first thing to consider is cooling capacity, measured in British Thermal Units (BTUs). This tells you how much heat the unit can remove from a room per hour. Too few BTUs, and your room will stay warm. Too many, and you’ll waste energy and create a clammy, overcooled space.

As a general rule:

• 100–300 sq. ft.: 5,000–6,000 BTUs
• 300–500 sq. ft.: 7,000–8,000 BTUs
• 500–700 sq. ft.: 10,000–12,000 BTUs
• 700+ sq. ft.: 14,000+ BTUs

Keep in mind that factors like ceiling height, insulation, sun exposure, and the number of windows can affect your needs. A south-facing room with large windows might need a higher BTU rating than a shaded, well-insulated space of the same size.

Energy Efficiency (EER and SEER)

Energy efficiency is crucial—not just for your wallet, but for the environment. Look for units with a high Energy Efficiency Ratio (EER) or Seasonal Energy Efficiency Ratio (SEER). EER is more common for room ACs and measures how efficiently the unit uses electricity under specific conditions. A higher EER means lower energy bills.

For example, a unit with an EER of 10 uses less energy than one with an EER of 8. Many modern thru wall units now boast EER ratings of 10 or higher, especially those with inverter technology. Some even qualify for ENERGY STAR certification, which means they meet strict efficiency guidelines set by the U.S. Environmental Protection Agency.

Noise Level (Decibels)

Nobody wants a noisy AC unit buzzing in the background while they’re trying to sleep or work. Noise level is measured in decibels (dB), and lower is better. Most thru wall units range from 45 dB to 60 dB.

To put that in perspective:

• 45 dB: Quiet library
• 50 dB: Gentle rainfall
• 60 dB: Normal conversation

If quiet operation is a priority—especially for bedrooms or home offices—look for models that advertise “ultra-quiet” performance or feature sound-dampening technology. Some units even have a “sleep mode” that reduces fan speed and noise at night.

Installation Requirements

Thru wall units require a dedicated wall opening, typically between 24” x 18” and 30” x 24”, depending on the model. The wall must be sturdy enough to support the unit’s weight (usually 80–150 lbs), and you’ll need access to an electrical outlet or hardwired connection.

Most units come with a wall sleeve or chassis that’s installed during construction or renovation. If you’re retrofitting an existing wall, you may need to cut an opening and frame it properly. Some models include a built-in sleeve, while others require a separate purchase. Always check the manufacturer’s installation guide before buying.

Smart Features and Controls

Modern thru wall air conditioners often come with smart features that make them more convenient and energy-efficient. Look for:

• Wi-Fi connectivity: Control your AC from your phone, set schedules, or integrate with smart home systems like Alexa or Google Home.
• Remote control: Adjust temperature, fan speed, and modes from across the room.
• Programmable timers: Set the unit to turn on or off at specific times—perfect for cooling your room before you get home.
• Multiple fan speeds and modes: Cool, fan-only, dehumidify, and auto modes give you more control over comfort.

One user in Seattle praised her smart thru wall unit: “I can turn it on from my phone while I’m still at work. By the time I get home, the house is perfectly cool. It’s like having a personal climate butler.”

Top Thru Wall Air Conditioner Models in 2024

With so many options on the market, it can be tough to know which thru wall air conditioner is right for you. We’ve rounded up some of the best models available in 2024, based on performance, efficiency, noise level, and user reviews.

Friedrich Chill Premier 12,000 BTU

The Friedrich Chill Premier is a top-tier choice for those who want premium cooling with quiet operation. With 12,000 BTUs, it’s ideal for rooms up to 550 square feet. It features a high EER of 12.0, making it one of the most energy-efficient units in its class.

What sets it apart? Its QuietMaster technology reduces noise to just 49 dB, and it includes a built-in Wi-Fi module for smart control. The unit also has a washable filter, auto-restart after power outages, and a sleek, modern design that blends into any wall.

One reviewer noted: “It’s so quiet, I forget it’s running. And the app lets me adjust the temperature from bed—no more getting up in the middle of the night.”

LG LW1222IVSM 12,000 BTU

LG’s LW1222IVSM is a smart thru wall unit that combines power with convenience. It delivers 12,000 BTUs and features LG’s Dual Inverter Compressor, which adjusts cooling output for consistent temperatures and lower energy use.

This model is ENERGY STAR certified and operates at just 48 dB. It includes Wi-Fi connectivity, voice control via Alexa and Google Assistant, and a 24-hour timer. The unit also has a “Plasmaster Ionizer” that helps reduce airborne pollutants.

A user in Texas said: “I love that I can ask Alexa to cool the room. It’s also surprisingly energy-efficient—my electric bill didn’t spike like I expected.”

Keystone KSTAT12-11C 12,000 BTU

If you’re looking for a budget-friendly option that still delivers solid performance, the Keystone KSTAT12-11C is worth considering. At around half the price of premium models, it offers 12,000 BTUs and an EER of 11.0.

It includes a remote control, three cooling speeds, and a washable filter. While it doesn’t have Wi-Fi, it’s reliable, easy to install, and great for renters or those on a tight budget.

One customer shared: “It’s not fancy, but it cools my 500-square-foot apartment perfectly. And for the price, I can’t complain.”

Frigidaire FHPW122AC1 12,000 BTU

Frigidaire’s FHPW122AC1 is a solid mid-range option with smart features and strong performance. It offers 12,000 BTUs, an EER of 12.0, and Wi-Fi connectivity.

The unit includes a remote, programmable timer, and four modes: cool, fan, dry, and energy saver. It’s also relatively quiet at 52 dB and has a sleek, low-profile design.

A homeowner in Florida said: “It keeps my living room cool even during heatwaves. The app is easy to use, and I love the energy saver mode.”

Installation and Maintenance Tips

Installing a thru wall air conditioner isn’t as simple as plugging in a window unit, but with the right preparation, it’s totally doable—even for DIYers. Proper installation ensures efficiency, safety, and longevity.

Pre-Installation Checklist

Before you start, make sure you have:

• A sturdy exterior wall (wood, concrete, or brick)
• Access to an electrical circuit (115V or 230V, depending on the unit)
• The correct wall sleeve or chassis (included or purchased separately)
• Tools: drill, level, measuring tape, saw, screwdriver, and safety gear
• Help from a friend (these units are heavy!)

Always consult the manufacturer’s installation manual and local building codes. In some areas, you may need a permit or professional electrician for the wiring.

Step-by-Step Installation Guide

Here’s a simplified overview of the process:

1. Measure and mark the wall opening according to the unit’s specifications.
2. Cut the opening using a reciprocating saw or hole saw. Be careful of electrical wires or plumbing behind the wall.
3. Install the wall sleeve and secure it with screws. Use flashing and sealant to prevent water leaks.
4. Connect the electrical wiring (hire a licensed electrician if you’re not experienced).
5. Slide the AC unit into the sleeve and secure it with mounting brackets.
6. Seal all gaps with weatherstripping or foam insulation to prevent air leaks.
7. Test the unit and adjust settings as needed.

Pro tip: Install the unit with a slight downward tilt (about 1/4 inch) toward the outside to allow condensation to drain properly.

Maintenance for Long-Term Performance

To keep your thru wall AC running smoothly, follow these maintenance tips:

• Clean the filter monthly—a dirty filter reduces airflow and efficiency.
• Inspect the exterior vent for debris, leaves, or blockages.
• Check the seal around the unit annually and reapply caulk if needed.
• Schedule professional servicing every 2–3 years to check refrigerant levels and electrical connections.

One maintenance pro advised: “A well-maintained thru wall unit can last 10–15 years. Neglect it, and you’ll be replacing it in half that time.”

Pros and Cons of Thru Wall Air Conditioners

Like any appliance, thru wall air conditioners have their strengths and weaknesses. Let’s break them down so you can decide if they’re the right fit for your home.

Advantages

• Permanent, built-in look: No more bulky window units or hoses snaking across the floor.
• Energy efficient: Many models have high EER ratings and inverter technology.
• Quiet operation: Advanced compressors and sound-dampening materials reduce noise.
• Better air sealing: Properly installed units prevent drafts and humidity infiltration.
• Smart features: Wi-Fi, remote control, and programmable timers add convenience.
• Space-saving: Frees up windows and floor space.

Disadvantages

• Higher upfront cost: More expensive than window or portable units.
• Permanent installation: Not ideal for renters or temporary setups.
• Complex installation: Requires cutting a wall and electrical work.
• Limited flexibility: Once installed, it’s not easy to move or remove.
• Potential for leaks: Poor sealing can lead to water damage or mold.

One homeowner in Chicago summed it up: “It was a bit of a project to install, but now I have a clean, quiet, efficient cooling system that looks like it belongs. Totally worth it.”

Thru Wall vs. Other Cooling Options: A Comparison

To help you make the best decision, here’s a quick comparison of thru wall air conditioners against other common cooling solutions.

Feature	Thru Wall AC	Window AC	Portable AC	Central Air
Installation	Permanent, wall-mounted	Window-mounted	Portable, hose vented	Ducted, whole-house
Cooling Area	Single room	Single room	Single room	Entire home
Energy Efficiency	High (EER 10–12+)	Medium (EER 8–10)	Low (EER 7–9)	High (SEER 13–20+)
Noise Level	Low (45–55 dB)	Medium (50–60 dB)	Medium-High (55–65 dB)	Low (outdoor unit only)
Cost	$$$	$	$$	$$$$
Aesthetics	Clean, built-in	Bulky, blocks view	Clunky, takes floor space	Invisible (ducts hidden)
Best For	Homes without central air, renters with wall access	Budget cooling, temporary use	Flexibility, no installation	Whole-home comfort, new builds

As you can see, thru wall units strike a great balance between efficiency, noise, and aesthetics—making them a smart choice for many homeowners.

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

Choosing the right cooling system is about more than just beating the heat—it’s about comfort, convenience, and long-term value. A thru wall air conditioner offers a permanent, efficient, and stylish solution for cooling individual rooms without the drawbacks of window or portable units.

If you’re tired of noisy, drafty window ACs or the hassle of dragging a portable unit from room to room, a thru wall unit could be the upgrade you’ve been waiting for. With models ranging from budget-friendly to smart-enabled, there’s an option for nearly every need and budget.

Just remember: proper sizing, installation, and maintenance are key to getting the most out of your investment. Take the time to measure your space, check your wall’s suitability, and choose a model with the features that matter most to you.

So, the next time the temperature climbs and the sun beats down, you can relax in cool, quiet comfort—knowing your thru wall air conditioner has your back. Stay cool, stay comfortable, and enjoy every breeze.

Frequently Asked Questions

What is a thru wall air conditioner unit?

A thru wall air conditioner unit is a type of air conditioning system designed to be installed directly through an exterior wall, providing cooling to a single room or space without requiring ductwork. These units are ideal for apartments, older homes, or rooms where central AC isn’t practical.

How do I choose the best thru wall air conditioner for my room?

To choose the best thru wall air conditioner, consider the room size in square feet and match it to the unit’s BTU (British Thermal Unit) rating—larger rooms require higher BTUs. Also, look for energy-efficient models with a high EER (Energy Efficiency Ratio) to save on electricity costs.

Can a thru wall air conditioner also heat my room?

Yes, many thru wall air conditioner units come with built-in heating functions, often using electric heat or heat pump technology. These models provide year-round comfort, making them a great all-in-one solution for both summer cooling and winter heating.

Are thru wall air conditioners difficult to install?

Installation can be moderately challenging and typically requires cutting a hole in an exterior wall and securing the unit with a sleeve or frame. It’s recommended to hire a professional for safe, proper installation, especially to ensure weatherproofing and structural integrity.

What are the benefits of a thru wall air conditioner compared to window units?

Thru wall air conditioners offer a more permanent and secure installation than window units, and they don’t block natural light or obstruct window use. They also tend to be quieter and can be more energy efficient, especially in larger or multi-room applications.

Do thru wall air conditioners require special maintenance?

Like all AC units, thru wall air conditioners need regular maintenance, including cleaning or replacing air filters every few months and clearing debris from the exterior vents. Annual professional servicing helps maintain efficiency and prolong the unit’s lifespan.