10 Best Energy Efficient Window Air Conditioners With Heat For 2026

If you want year-round comfort without paying for separate cooling and heating equipment, an energy efficient window air conditioner with heat can be a smart buy.

This roundup focuses on units that balance performance, efficiency, noise, smart features, and room coverage so you can narrow the field fast.

Best 10 Energy Efficient Window Air Conditioner with Heat Picks for 2026

Editor’s Pick – Midea 12,000 BTU Smart Window AC with Heat

If you want an energy efficient window air conditioner with heat for a large room, this Midea 12,000 BTU model is built to do both jobs well. It cools and dehumidifies in summer, then adds supplemental heat in cooler months, with smart controls and inverter technology aimed at lowering running costs.

Best For: Large bedrooms, living rooms, or apartments up to 550 sq. ft. where quiet operation and energy savings matter.

Pros:

• Energy Star certified with inverter technology and up to 35% energy savings
• Quiet operation as low as 45 dBA for bedrooms and workspaces
• SmartHome app, Alexa, and Google Assistant compatibility
• 5 modes, 3 speeds, 24-hour timer, and ECO energy saver

Cons:

• Heat pump function will not operate below 41°F outside temperature
• Requires a double-hung window with specific opening dimensions

Overall, this is the strongest all-around option here if you want efficient year-round comfort with quieter performance and plenty of smart features.

High-Capacity Smart Choice – Bonnlo 18,000 BTU Wi-Fi Window AC with Heat

This Bonnlo unit is a practical pick if you need an energy efficient window air conditioner with heat for a much larger space. It combines strong 18,000 BTU cooling with heating output, plus Wi-Fi control, Alexa support, and an eco mode designed to help trim power use.

Best For: Large rooms, apartments, or home offices up to 1,000 sq. ft. that need stronger cooling and heating from one window unit.

Pros:

• High-capacity 18,000 BTU cooling with 8,600-10,600 BTU heating
• Wi-Fi enabled with app control and Alexa voice commands
• Eco mode and compressor cycling help reduce unnecessary electricity use
• Quiet operation rated as low as 56 dB

Cons:

• Requires 230V power, so it is not a standard low-voltage plug-in option
• Larger physical size may be more demanding to install than smaller units

If your priority is coverage over compact size, this model stands out for its capacity, smart controls, and year-round flexibility.

Premium Compact Option – Friedrich Chill Premier+ 8,000 BTU Window AC with Heat

The Friedrich Chill Premier+ is a compact energy efficient window air conditioner with heat for smaller spaces where Wi-Fi control and a premium-brand setup matter. It delivers 8,000 BTU cooling, electric heat, and app-based control in a 115V format that fits easier into many homes.

Best For: Smaller rooms that need a window or wall unit with smart connectivity and electric heat.

Pros:

• Wi-Fi enabled with app control and remote operation
• 115V design is easier to match with common household outlets
• Includes electric heat for added seasonal flexibility
• Backed by a 1-year manufacturer warranty plus 13-month extension program

Cons:

• Cooling capacity is limited to 8,000 BTU, so it is not for large spaces
• Supplied details do not list advanced energy-saving ratings like Energy Star

This is a sensible fit for users who want a smaller smart unit with heat rather than maximum coverage or the most feature-heavy efficiency package.

Budget-Friendly Smart Pick – Garvee 8,000 BTU Window AC with Heat

If you’re shopping for an energy efficient window air conditioner with heat for a smaller room, this Garvee 8,000 BTU unit covers the basics well. It adds heating, dehumidifying, fan, and auto modes, plus app and voice control, while using ECO saver and timer settings to help curb waste.

Best For: Apartments, bedrooms, or living spaces up to 350 sq. ft. that need simple all-season comfort and smart control.

Pros:

• 4-in-1 design with cooling, heating, dehumidifying, and fan modes
• App, remote, touch, and Alexa voice control options
• ECO energy saver, sleep mode, and 24-hour timer support efficiency
• Quiet operation as low as 52 dB

Cons:

• Best suited to smaller rooms, not larger open spaces
• Supplied notes do not mention Energy Star certification or inverter technology

For a compact unit, this one balances useful features and easy control, making it a straightforward pick for everyday seasonal use.

Top Pick for Quiet Year-Round Comfort – Soleus Air 12,000 BTU Window AC with 10,000 BTU Heat

If you want an energy efficient window air conditioner with heat for year-round use, this Soleus Air model stands out for its inverter compressor and 4-season design. It cools a room, adds supplemental heat, and uses a saddle-mount setup that keeps the window view open while moving most of the noise outside.

Best For: Buyers who want a quieter, more efficient window unit that can handle both cooling and heating through the seasons.

Pros:

• Inverter compressor is designed to run more efficiently at variable speeds.
• Built-in heat makes it a true 4-season window unit.
• Saddle-mount design helps keep the window view unobstructed.
• Claims quiet operation with noise pushed to the outdoor side of the wall.

Cons:

• Requires a compatible window/wall setup with extra-thick wall support.
• Heat output is supplemental rather than a full home-heating solution.

This is a strong fit if efficiency and lower noise matter as much as comfort. The Wi-Fi control and inverter design add convenience, while the heating function makes it useful beyond summer.

Smart Value for Small Rooms – ROVSUN 8,000 BTU Window AC with Heat

This ROVSUN window air conditioner with heat is a practical pick if you want an energy efficient window air conditioner with heat for a smaller room. It combines cooling, 4,000 BTU heating, dehumidifying, fan modes, and ECO energy-saver features, while adding app and voice control for easy day-to-day use.

Best For: Small rooms, apartments, or offices where smart controls and all-season comfort are more important than maximum output.

Pros:

• Supports cooling, heating, dry, and fan modes for multi-season use.
• ECO energy-saver mode helps reduce waste during operation.
• Wi-Fi, app, and voice control add convenient remote management.
• Designed for rooms up to 350 square feet.

Cons:

• No inverter compressor, so it may not be as efficient as inverter-based models.
• Heating capacity is modest at 4,000 BTU.

Overall, this unit is a good fit when you want a compact, connected window AC that can also provide heat. It’s especially appealing for users who value simple installation and smart-home compatibility.

Reliable Apartment Choice – Whirlpool 8,000 BTU Window AC with Supplemental Heat

The Whirlpool 8,000 BTU window air conditioner with heat is built for rooms up to 350 square feet and offers a straightforward, practical feature set. If you’re shopping for an energy efficient window air conditioner with heat, the eco mode, sleep mode, washable filter, and programmable timer make it easy to manage comfort without unnecessary fuss.

Best For: Bedrooms, living rooms, and apartments where you want simple controls and dependable supplemental heat.

Pros:

• Includes supplemental heat along with 8,000 BTU cooling.
• Eco mode, sleep mode, and a 24-hour timer support efficient use.
• Washable filter is reusable and easy to clean.
• 8-way directional louvers help customize airflow.

Cons:

• Supplemental heat is not intended as a primary heat source in the coldest months.
• SEER rating is lower than some more efficient competitors.

This Whirlpool model is a solid no-nonsense option for people who want room cooling plus extra heat in one unit. It focuses on practical comfort features rather than smart-home extras.

Compact 4-in-1 Pick – ROVSUN 8000 BTU Window AC with Heat

If you want an energy efficient window air conditioner with heat for a smaller room, this ROVSUN 4-in-1 unit is built for simple year-round use. It combines cooling, supplemental heat, dehumidifying, and fan modes in one window setup, with remote and LED controls that keep daily operation straightforward.

Best For: Bedrooms, apartments, and home offices up to 350 sq. ft. that need a compact heat-and-cool window unit.

Pros:

• 8,000 BTU cooling and 4,000 BTU heating for rooms up to 350 sq. ft.
• Energy-saving design with a high-quality compressor and ECO mode support.
• Quiet operation as low as 52 dB for less disruption while sleeping or working.
• Includes side panels, installation parts, remote control, and 24-hour timer.

Cons:

• Heating is supplemental rather than a primary heat source.
• Requires checking window size before purchase.

Overall, this is a practical pick if you want a compact window unit that covers both cooling and light supplemental heating without a complicated setup. Its energy-saving focus and quieter operation make it especially appealing for everyday residential use.

High-Capacity Large-Room Choice – Keystone 23,200 BTU Window AC with Heat

This Keystone model is an energy efficient window air conditioner with heat for large spaces that need serious cooling capacity plus supplemental warmth. It adds dehumidification and fan circulation, and the Energy Saver or Sleep modes are designed to help keep operating costs in check.

Best For: Large rooms up to 1,500 sq. ft. that need a high-capacity window AC with supplemental heat.

Pros:

• 23,200 BTU cooling with 16,000 BTU supplemental heating for large areas.
• All-in-one functions include cooling, heating, dehumidifying, and fan circulation.
• Smart remote reads room temperature and updates the unit for more accurate control.
• Energy Saver and Sleep modes can help reduce power use.

Cons:

• Supplemental heating is not intended to be the primary heat source.
• Requires 230V power, which may limit installation options.
• Heavier unit at 121 pounds.

For shoppers who need to condition a much larger room, this is the most powerful option in the group. It’s a strong fit when you want one window unit to handle cooling, light heating, and dehumidification across a big footprint.

Efficient Small-Room Upgrade – Keystone Energy Star 8000 BTU Window AC with Heat

For a smaller space, this Keystone is a smart energy efficient window air conditioner with heat thanks to its inverter technology and Energy Star design. It cools, provides supplemental heating, and dehumidifies while aiming to run more efficiently and more quietly than a standard window unit.

Best For: Apartments and medium rooms up to 350 sq. ft. where efficiency and quieter operation matter.

Pros:

• Inverter technology helps reduce wasted operation and maintain target temperature.
• Energy Star and 14.5 SEER efficiency support lower energy use.
• Quieter than regular room air conditioners by the manufacturer’s claim.
• Includes supplemental heat, dehumidifier mode, remote control, and washable filter alert.

Cons:

• Supplemental heating is not meant to be a primary heat source.
• Best suited to rooms up to 350 sq. ft., not larger spaces.

This is the best fit if efficiency is your top priority and you want a smaller window unit with heat. The inverter setup and Energy Star positioning make it a strong everyday option for apartments and medium-sized rooms.

How We Picked the Best Energy Efficient Window Air Conditioner with Heat

We prioritized models that combine solid cooling capacity with practical supplemental heat, while also considering energy-saving design, noise levels, controls, and installation flexibility. For an Energy Efficient Window Air Conditioner with Heat, the best choice is usually the one that matches your room size closely instead of oversizing just for the highest BTU number.

Quick Comparison

Smaller 8,000 BTU units are generally better for bedrooms, home offices, and apartments, while 12,000 BTU models suit larger living areas. Heavy-duty options like the 18,000 BTU and 23,200 BTU units are better for larger spaces or open-plan rooms. If efficiency matters most, look for inverter technology, Energy Star certification, and smart thermostatic controls that reduce unnecessary cycling.

Key Buying Factors for an Energy Efficient Window Air Conditioner with Heat

Room Size and BTU Match

BTU capacity should align with your square footage. Undersized units struggle to maintain temperature, while oversized units can short-cycle and waste energy. Check both cooling coverage and heating output, especially if you plan to rely on the heat function often.

Efficiency Features

Inverter compressors, Energy Star ratings, programmable timers, and eco modes can all help lower electricity use. If you want the best efficiency over time, these features matter more than flashy extras.

Heat Type

Most window units in this category use supplemental electric heat rather than primary whole-home heating. That makes them ideal for shoulder seasons, zone heating, or supplementing an existing HVAC system.

Installation and Compatibility

Make sure your window can support the unit’s size, weight, and voltage requirements. Some models also work with thicker walls or offer window-and-wall installation options, which can expand placement choices.

Controls and Noise

Remote controls, Wi-Fi, app support, and voice compatibility improve day-to-day convenience. Quiet operation is especially important for bedrooms and shared spaces.

Who Should Buy Which Energy Efficient Window Air Conditioner with Heat?

If you want the best all-around balance, choose a mid-size efficient model with inverter or Energy Star credentials. If you need smart-home integration, look for Wi-Fi and voice control. If your priority is heating support in a larger room, step up to a higher-BTU unit with stronger supplemental heat. For bedrooms and smaller apartments, a quieter 8,000 BTU Energy Efficient Window Air Conditioner with Heat is often the most practical choice.

In short, match the unit to your room, then use efficiency features to cut operating costs. That approach will usually deliver better comfort, lower bills, and fewer compromises than choosing by BTU alone.