Keeping a large open space cool and comfortable can feel like a never-ending battle, especially when a traditional window unit isn’t an option or just isn’t powerful enough. That’s where a through-wall air conditioner comes into play – offering a permanent, powerful, and often more aesthetically pleasing solution. These units are built right into your wall, freeing up window space and providing robust cooling (and sometimes heating!) for those expansive rooms, garages, or offices.

But with so many options out there, how do you pick the best through wall air conditioner for large open space that genuinely delivers? We’ve done the legwork for you! We’ve reviewed five top contenders, breaking down their features, pros, and cons to help you make an informed decision and finally enjoy consistent comfort. Let’s dive in!

Our Top Picks for Through-Wall Air Conditioners

1. Keystone 14,000 BTU Wall Mounted Air Conditioner with Supplemental Heat

This Keystone unit is a fantastic all-rounder for anyone needing both powerful cooling and a bit of a heat boost in their large open space. What makes it stand out is its dual functionality, offering a solid 14,000 BTUs for cooling up to 700 sq. ft. while also providing supplemental heat for those chilly days. It’s designed to keep your room comfortable year-round without hogging precious window real estate.

• Key Features:

  • Powerful 14,000 BTU cooling and 10,600 BTU supplemental heating capacity.
  • Cools and heats large spaces up to 700 sq. ft.
  • Offers cooling, supplemental heating, dehumidification, and fan modes.
  • Supplemental heating works best between 23°F and 76°F (not for primary heat).
  • Space-saving, wall-mounted design with an easy interior trim kit installation.
  • Requires a special 230-volt/20-amp electrical outlet.
  • Smart remote control with ‘Follow Me’ feature senses room temperature for accurate comfort.
  • Energy Saver and Sleep modes help reduce electricity consumption.

• Pros:

  • Excellent for year-round comfort with both cooling and supplemental heating.
  • Covers a substantial area, ideal for large rooms.
  • Smart remote enhances temperature accuracy.
  • Energy-saving features help manage utility bills.
  • Maintains window view and floor space.

• Cons:

  • Requires a specific 230V/20A electrical outlet, which might need professional installation.
  • Supplemental heat is not intended as a primary heat source.
  • Installation involves cutting into a wall, which can be a bigger project.

• User Impressions: Users frequently praise this unit for its strong cooling capabilities and the convenience of having supplemental heat. Many appreciate the ‘Follow Me’ remote for its precision in maintaining desired temperatures, making it a reliable choice for consistent climate control in larger areas.

See it on Amazon here

2. ROVSUN 8000 BTU Through the Wall Air Conditioner with Heat

The ROVSUN 8000 BTU unit is a compact yet mighty option, perfect for medium to large spaces where full climate control is desired. It’s not just an air conditioner; it also provides effective heating, making it a versatile choice for bedrooms, home offices, or studio apartments up to 350 sq. ft. Its quick DIY installation and easy-clean design are definite crowd-pleasers.

• Key Features:

  • 8,000 BTU cooling and heating capacity for spaces up to 350 sq. ft.
  • Dual control via intuitive LED panel or included remote control.
  • 4 versatile modes: Cool, Heat, Fan, and Dry, with 3 adjustable fan speeds.
  • 24-hour programmable timer for customized operation.
  • Removable, washable front-panel filter for easy maintenance and fresh air.
  • Designed for quick DIY installation, fitting standard 25.5″ wall sleeves (sleeve not included).
  • Includes a trim kit and rear grille for a complete setup.

• Pros:

  • Provides both cooling and heating, offering year-round comfort.
  • Relatively easy DIY installation in under 30 minutes (if a sleeve is present).
  • Low maintenance with an easy-clean filter.
  • Versatile operation modes and timer for tailored comfort.
  • Compact size makes it suitable for various room types.

• Cons:

  • Wall sleeve is not included, an additional purchase might be necessary.
  • 8,000 BTUs might be on the lower end for exceptionally large, open spaces, depending on insulation.
  • May require a dedicated circuit depending on local electrical codes.

• User Impressions: Customers often highlight the ROVSUN’s straightforward installation process and its effectiveness in small to medium-sized rooms. The dual cooling and heating functionality is a big plus for those looking for a single, comprehensive climate solution without breaking the bank.

See it on Amazon here

3. BLACK+DECKER Window or Through The Wall Air Conditioner, 18,000 BTU

When you’re dealing with truly massive open spaces, the BLACK+DECKER 18,000 BTU unit steps up to the plate. This powerhouse is designed to keep rooms up to 1,000 square feet comfortably cool, making it an excellent choice for whole floors, large living areas, or spacious commercial settings. What’s really clever is its dual-purpose design, allowing for both window and through-the-wall installation, giving you flexibility where you need it most.

• Key Features:

  • Impressive 18,000 BTU cooling capacity.
  • Effectively cools spaces up to 1,000 square feet.
  • Four fan levels: Auto, Low, Medium, and High for optimal air circulation.
  • Full-function remote control with Sleep mode, Energy Saver, and 24-hour timer.
  • Easy window installation with accordion-style side panels (fits 28″ to 40.5″ wide windows).
  • Includes wall sleeve and parts for through-the-wall installation.
  • Through-the-wall installations and electrical wiring are recommended to be performed by a licensed professional.

• Pros:

  • Exceptional cooling power for very large rooms and open floor plans.
  • Flexible installation options (window or through-the-wall).
  • Comprehensive remote control offers convenience and energy-saving modes.
  • Strong air delivery ensures consistent cooling throughout the space.

• Cons:

  • No heating function mentioned, primarily a cooling unit.
  • Through-the-wall installation likely requires professional help due to its size and electrical demands.
  • Heavy unit, making handling and installation potentially more challenging.
  • May require a dedicated 230V electrical circuit.

• User Impressions: Reviewers rave about the sheer cooling power of this BLACK+DECKER unit, confirming it lives up to its promise for large areas. The convenience of the remote control and energy-saving options are frequently highlighted as beneficial for maintaining comfort while keeping an eye on electricity usage.

See it on Amazon here

4. Keystone 14,000 BTU 230V Wall Mounted Air Conditioner & Dehumidifier

Here’s another great contender from Keystone, offering a robust 14,000 BTUs of cooling power for expansive areas up to 700 square feet. This specific model is a cooling-focused machine with excellent dehumidification capabilities, making it ideal for humid climates or spaces prone to dampness. If your primary goal is powerful, efficient cooling and moisture removal in a large room without needing a heating function, this unit is a strong candidate for the best through wall air conditioner for large open space.

• Key Features:

  • Reliable 14,000 BTU through-the-wall air conditioner for rooms up to 700 sq. ft.
  • Three cooling modes, three fan speeds, and 4-way adjustable air louvers for personalized comfort.
  • Removes 2.9 pints of moisture from the air per hour with built-in dehumidification.
  • Space-saving design keeps windows clear; easy installation with a universal interior trim kit.
  • Requires a special 230-volt/20-amp electrical outlet.
  • Smart remote control with ‘Follow Me’ technology for accurate temperature sensing.
  • Energy Saver and Sleep modes help reduce operational costs.

• Pros:

  • Highly effective cooling for large spaces.
  • Excellent dehumidification capacity, great for humid environments.
  • Smart remote ensures precise temperature control.
  • Energy-saving features help cut down on electricity bills.
  • Wall-mounted design is discreet and preserves window views.

• Cons:

  • Does not offer a heating function.
  • Requires a special 230V/20A electrical outlet, which may involve professional wiring.
  • Installation is more involved than a window unit.

• User Impressions: Customers are very satisfied with this Keystone unit’s ability to quickly and thoroughly cool large, open areas. The strong dehumidification feature is often praised for making spaces feel much more comfortable, especially during sticky summer months. The ‘Follow Me’ remote is consistently highlighted for its convenience and accuracy.

See it on Amazon here

5. Keystone 10,000 BTU Through the Wall Air Conditioner and Dehumidifier

For those needing substantial cooling for a large apartment, master bedroom, or medium-sized living space (up to 450 sq. ft.) but prefer a standard 115V electrical connection, this 10,000 BTU Keystone unit is a fantastic choice. It balances powerful cooling and effective dehumidification with the convenience of a simpler electrical requirement, making it an accessible option for many homes.

• Key Features:

  • Powerful 10,000 BTU cooling for spaces up to 450 sq. ft.
  • Three cooling modes, three fan speeds, and 4-way adjustable air louvers.
  • Removes 2.3 pints of moisture per hour with the built-in dehumidification system.
  • Space-saving through-wall design, uses a standard 115V electrical outlet.
  • Easy installation with a universal interior trim kit.
  • Smart remote control with ‘Follow Me’ technology for accurate room temperature sensing.
  • ‘Energy Saver’ and ‘Sleep’ modes to optimize energy consumption.

• Pros:

  • Strong cooling and dehumidification for medium-to-large rooms.
  • Operates on a standard 115V outlet, simplifying installation.
  • Smart remote control provides precise temperature management.
  • Energy-efficient features help reduce utility costs.
  • Wall-mounted design is sleek and keeps windows clear.

• Cons:

  • 10,000 BTUs might not be sufficient for extremely large or poorly insulated open spaces.
  • No heating function.
  • Requires a wall opening, which can be a significant project.

• User Impressions: Users frequently commend this 10,000 BTU Keystone unit for its reliable cooling performance in target-sized rooms and its user-friendly 115V operation. The energy-saving features are often appreciated, providing peace of mind while enjoying a cool, dry environment.

See it on Amazon here

What to Look for in the Best Through-Wall Air Conditioner for Large Open Spaces

Choosing the right through-wall AC unit for your expansive area involves considering a few key factors:

• BTU Rating: This is critical! British Thermal Units (BTUs) determine how much space an AC can cool. For large open spaces, you’ll generally want at least 10,000 BTUs, and often 14,000 BTU or even 18,000 BTU, depending on your square footage, ceiling height, sun exposure, and insulation. A good rule of thumb is 20 BTUs per square foot.
• Cooling & Heating Capabilities: Do you need year-round comfort? Some units offer supplemental heating, which can be a lifesaver during cooler months, while others are cooling-only.
• Energy Efficiency: Look for Energy Star certifications and features like “Energy Saver” or “Sleep” modes. These can significantly reduce your electricity bill over time.
• Electrical Requirements: Through-wall ACs can require either a standard 115V outlet or a dedicated 230V/20A circuit. Ensure your home’s electrical system can support the unit you choose, as a 230V unit may require professional wiring.
• Installation: While all are “through-wall,” some are more DIY-friendly than others, especially if a wall sleeve is needed or included. Consider if you’ll need professional help for cutting into the wall or electrical work.
• Smart Features: Remote controls with ‘Follow Me’ technology, programmable timers, and multiple fan speeds offer convenience and better temperature regulation.
• Dehumidification: Many AC units also pull moisture from the air, which can make a space feel cooler and more comfortable, especially in humid climates.

Frequently Asked Questions (FAQ)

Q1: What size BTU do I need for a large open space?

A1: For large open spaces, you’ll typically need a minimum of 10,000 BTUs. Spaces up to 700 sq. ft. often require 14,000 BTUs, while very large areas up to 1,000 sq. ft. might need 18,000 BTUs or more. Factors like ceiling height, insulation, and sun exposure can also influence the ideal BTU rating.

Q2: Is a through-wall AC better than a window AC for large spaces?

A2: Generally, yes. Through-wall ACs are often more powerful, have a more permanent and aesthetically pleasing installation, and don’t block window views. They also tend to be more efficient at cooling large, open areas consistently.

Q3: Can a through-wall AC provide heat as well?

A3: Many through-wall AC units offer a supplemental heating function. This is great for taking the chill out of a room during mild weather, but it’s important to remember that “supplemental” heat is usually not designed to be a primary heat source in very cold climates.

Q4: Do through-wall air conditioners require a special electrical outlet?

A4: It depends on the unit’s BTU rating and power consumption. Some smaller units (e.g., 8,000-10,000 BTUs) can operate on a standard 115V outlet. However, more powerful units (e.g., 14,000 BTUs and up) often require a dedicated 230V/20A electrical circuit, which may necessitate professional electrical work.

Q5: Is installation difficult for a through-wall air conditioner?

A5: Through-wall AC installation is more involved than a window unit. It typically requires cutting an opening in an exterior wall and installing a wall sleeve. While some units are designed for DIY installation with included trim kits, electrical wiring for 230V units or custom wall cutting often warrants professional help to ensure safety and proper sealing.

Q6: How can I make my through-wall AC more energy-efficient?

A6: Look for units with an Energy Star rating, and utilize features like ‘Energy Saver’ mode, ‘Sleep’ mode, and programmable timers. Regular maintenance, such as cleaning or replacing the air filter, also significantly improves efficiency and cooling performance.

Q7: What’s the difference between a “wall mounted” and “through the wall” air conditioner?

A7: While often used interchangeably, “through the wall” specifically means the unit is installed into a hole cut into an exterior wall, usually flush with the interior wall. “Wall mounted” can sometimes refer to mini-split units where the compressor is outside and an indoor unit is mounted on the wall, but in the context of this article, it’s used to describe the through-wall type.

Conclusion

Finding the best through wall air conditioner for large open space doesn’t have to be a daunting task. By considering your room’s size, desired features like heating or dehumidification, and electrical setup, you can pinpoint the perfect unit from our top five picks. Whether you need an absolute powerhouse like the BLACK+DECKER 18,000 BTU for vast areas or a versatile year-round solution like the Keystone 14,000 BTU with supplemental heat, there’s an option here to bring powerful, efficient comfort to your home. Say goodbye to sweltering summers and hello to a perfectly climate-controlled environment!