Finding the best in-wall heater air conditioner is essential for maintaining comfort in your home throughout the year. Whether you need cooling during hot summers or supplemental heat on chilly days, these versatile units can deliver reliable performance without occupying floor space. Below is a summary table highlighting top-performing models to help guide your choice.
Product | Cooling Capacity (BTU) | Heating Capacity (BTU) | Room Coverage (Sq.Ft.) | Control Features |
---|---|---|---|---|
Keystone 23,200 BTU Window-Wall AC | 23,200 | 16,000 (Supplemental) | Up to 1,500 | Smart Remote Control |
LG 9,800 BTU Through the Wall AC with Heat | 9,800 | Supplemental Heat | Up to 440 | Remote & Digital Control Panel |
Midea 12,000 BTU Smart Inverter AC with Heat | 12,000 | Supplemental Heat | Up to 550 | Remote, App, Voice Assistant |
BLACK+DECKER 14,000 BTU Smart Portable AC with Heat | 14,000 | 12,000 | Up to 700 | App & Voice Control |
Whirlpool 12,000 BTU Window AC with Heat | 12,000 | 11,000 Supplemental | Up to 550 | Digital Control Panel |
Content Navigation
- Keystone 23,200 BTU Window-Wall Air Conditioner with 16,000 BTU Supplemental Heat
- LG 9,800 BTU Through the Wall Air Conditioner with Supplemental Heat
- Midea 12,000 BTU Smart Inverter Air Conditioner with Heat and Dehumidifier
- BLACK+DECKER Smart Portable Air Conditioner with Heat, 14,000 BTU Cooling
- Whirlpool 12,000 BTU Window Air Conditioner with Supplemental Heat
- Buying Guide for In-Wall Heater Air Conditioners
Keystone 23,200 BTU Window-Wall Air Conditioner with 16,000 BTU Supplemental Heat

The Keystone 23,200 BTU wall air conditioner is a powerful option designed for large spaces up to 1,500 square feet. It combines cooling, supplemental heating, dehumidification, and fan circulation into a single unit. The supplemental heating mode is optimized for mild temperatures (23 to 76 degrees Fahrenheit) and is not intended as a primary heat source during extreme cold.
This unit features a smart remote control that measures the room temperature and adjusts cooling accordingly every three minutes. Its versatility and robust capacity make it suitable for living rooms, basements, and office areas needing year-round climate control.
LG 9,800 BTU Through the Wall Air Conditioner with Supplemental Heat

This LG model is tailored for smaller rooms up to 440 square feet, such as bedrooms or offices. It offers two fan speeds in cooling, heating, and fan modes, allowing customizable airflow and temperature control. The supplemental heat function provides added warmth on cooler days.
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Included are an easy-to-use digital control panel and remote, washable filter, and 4-way air deflection. The design facilitates efficient installation through the wall, providing steady temperature regulation without the need for space-consuming equipment.
Midea 12,000 BTU Smart Inverter Air Conditioner with Heat and Dehumidifier

The Midea 12,000 BTU Smart Inverter AC is ideal for moderate-sized rooms up to 550 square feet, featuring multi-season use with heat, cool, dry, fan, and auto modes. It is Energy Star certified for efficient power use and incorporates variable-speed inverter technology for reduced electricity consumption by up to 35% compared to standard models.
Controls include a remote, LED display, and smart technology compatibility with voice assistants like Alexa and Google Assistant. The unit’s defrost control and washable filter ensure maintenance ease and lasting performance.
BLACK+DECKER Smart Portable Air Conditioner with Heat, 14,000 BTU Cooling

This BLACK+DECKER 4-in-1 portable unit combines cooling, heating, dehumidifier, and fan functions, making it flexible for year-round use. It serves rooms up to 700 square feet and comes with smart features like Wi-Fi connectivity and voice control via Amazon Alexa or Google Assistant.
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Its compact design supports portability and can follow you with the remote “Follow Me” function that adjusts temperature based on your location in the room. This model balances power with technology for convenience in medium-sized spaces.
Whirlpool 12,000 BTU Window Air Conditioner with Supplemental Heat

The Whirlpool 12,000 BTU window unit offers robust cooling with 11,000 BTU supplemental heat, suitable for spaces up to 550 square feet. It is best for users needing straightforward, reliable operation with multiple comfort settings.
The electronic control panel features digital display, three cooling speeds, eco and sleep modes, and an 8-way directional air louvers system for customized airflow. Installation is user-friendly with a window mounting kit included, requiring only a 19.5-inch minimum window height.
Buying Guide for In-Wall Heater Air Conditioners
Choosing the right in-wall heater air conditioner requires consideration of several important factors to ensure efficient and effective comfort throughout the year.
- Cooling and Heating Capacity: Match the BTU rating to your room size. Larger spaces require higher BTU units, while smaller areas benefit from more moderate capacity to save energy.
- Type of Heat: Supplemental heating is common in these units and generally meant for mild cold. For severe winters, additional heating systems might be necessary.
- Installation Requirements: In-wall models require proper installation through a wall or window opening. Ensure your home layout supports this and consider professional installation if needed.
- Energy Efficiency: Look for ENERGY STAR certifications and inverter technology to reduce electricity use without compromising performance.
- Control Options: Remote controls, smart app compatibility, and voice control features enhance convenience and allow precise adjustments from anywhere.
- Additional Features: Consider units offering dehumidification, multiple fan speeds, auto-restart, and directional louvers for enhanced comfort customization.
- Noise Level: Some models emphasize quiet operation, critical for bedrooms or workspaces.
- Maintenance: Easily accessible and washable filters prolong unit life and maintain air quality.
Evaluating these aspects carefully will help you choose an in-wall heating and air conditioning unit suited to your specific needs, ensuring consistent comfort and energy savings year-round.