Best Window Heat Pumps – 2021 Reviews

| Last Updated: September 2, 2021

Window heat pumps are a wise choice for homeowners or renters who want to manage indoor temperatures without spending an arm and a leg. Despite their smaller size, they are more versatile all-around performers than furnaces or central air conditioners.

Comparison of the Best Window Heat Pumps

IMAGEPRODUCT
  • Four Distinct Modes of Functioning: Heating, Cooling, Dehumidification, and Ventilation
  • Superior Energy-Efficiency With 17 SEER (cooling) and 9 HSPF (heating) Ratings
  • Automatic Swing Air Louvers for Perfectly Even Air Distribution
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  • Four Modes of Operation: Heating, Cooling, Dehumidification, and Fan Only
  • Special Sleep and Energy-Saver Modes for Reduced Electricity Consumption
  • Electronic Push-Button Thermostat With Easy-to-Read Digital Display
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  • Slide-Out Chassis for Super-Convenient Two-Step Installation
  • Multi-Speed Electronic Controls: Three Fan Speeds, Three Cooling Speeds, and One Heating Speed
  • A 3,500 BTU Supplemental Heating Element for Superior Wintertime Functioning
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  • Virtually Silent Operation in All Modes and Speeds
  • Superior Heating and Cooling Ratings, at 9.0 HSPF and 15 SEER, Respectively
  • Remote Control Allows for Precise Heating and Cooling Management and Monitoring
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  • Outstanding Energy-Efficiency Ratings (20 SEER for Cooling and 10.3 HSPF for Heating)
  • Noise-Free Performance From Indoor Air Handler
  • Self-Diagnostic System Included for Immediate Detection of Any Problems
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Aspects to Consider Before Buying

Some of the major factors that should determine your choice of a window heat pump (or mini-split alternative) include:

Heating and Cooling Capacity

The potency of a heat pump is measured in BTUs, or British thermal units.  

If you want to control temperatures in an area of less than 1,000 square feet, you should look for a model that offers 15,000 BTUs or less of capacity. With as little as 8,000 BTUs, your heat pump can probably manage to heat or cool an area of 350 square feet.

For spaces of 1,000 square feet or more, you’ll likely need something in the 18,000 to 24,000 BTU range.

Energy Efficiency

Heat pumps are rated on separate scales for their heating and cooling functions. In cooling mode, a SEER (seasonal energy efficiency ratio) score of 15 or higher would be considered energy-efficient. Meanwhile, an HSPF (heating seasonal performance factor) of 9.0 or better would qualify as energy-efficient in the heating mode.

Either way, the higher the number, the more energy and cost-efficient the appliance.

Electrical Connectivity

Heat pumps powered at 115 volts can be connected to standard home electrical outlets. However, heat pumps of 18,000 BTUs or higher are likely to have connections in the 208-230 volt range and will require a special type of outlet. You will likely need to have one installed by an electrician if you choose a larger heat pump and that is an extra expense you should be prepared to pay.

Installation Requirements

Single-hung or double-hung windows are usually required for window heat pumps. If your windows are of a different type or are too small or large to hold a heat pump, you might be able to install one in a wall sleeve built for that purpose.

Your other option is to purchase a mini-split heat pump and air conditioner. With this technology, the compressor is installed outdoors while the indoor air handler is mounted on the wall. Pipes are inserted through small holes in the wall to connect the two halves of the system.

Review of the Best Window Heat Pumps

Window heat pumps are widely available but enormously variant in quality. Consequently, you won’t be sure what the best appliances are unless you seek out expert opinions.

To help you evaluate the possibilities, we’ve carefully evaluated the latest offerings from all the major brands. Based on our research, here are your top options in the window heat pump category:

Best Overall

Pioneer WYS012-17

PIONEER Air Conditioner WYS012GMFI22RL Wall Mount Ductless Inverter+ Mini Split Heat Pump, 12000 BTU-208/230 V, White

Specifications

Cooling Efficiency (Max SEER): 22.8

Heating Efficiency (max HSPF): 11.2

Decibel Level: 57.5

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Review

Checking in at a solid 12,000 BTUs, the Pioneer WYS012-17 offers an impressive package of heating and cooling technology that is unmatched in its performance capabilities. This exquisitely manufactured mini-split system is appropriate for use in a broad range of weather conditions. It includes a ductless indoor section for easy wall mounting, an outdoor heat pump featuring a high-efficiency inverter/compressor, an LCD wireless remote, and a 16’ installation kit.

Bottom Line

While it is not actually a window heat pump, the Pioneer WYS012-17 mini-split system gives you all the benefits of a window unit but with a supercharged level of performance. It provides incredible versatility, with dehumidification and ventilation modes in addition to its heating and cooling functions. Controllable from across the room, across town, or even across the planet, the Pioneer WYS012-17 lets you accurately manage the temperatures in your home seven days a week, 24 hours per day.

Pros

Comes With a Permanent Washable Air Filter

Can Effectively Heat or Cool a Space of Up to 800 Square Feet

Ductless Indoor Unit Can Be Mounted in Convenient Locations

Whisper-Quiet Operation Makes it Ideal for Bedroom Installation

Features Adjustable Air Distribution System for Full-Room Comfort

Multi-Speed Fan Operation Makes PreciseTemperature Management Easier

Wireless Internet Control Lets User Control the Unit From Outside the Home

Night Mode Adjusts Temperatures Up and Down Based on Sleeping Patterns

Remote Control With Digital Display Allows for Room-Wide System Management

Installation Kit Included, With 16 Feet of Copper Pipe, Connectors, Wiring, and Sealing Materials

Cons

Pricier Option Than a Traditional Window Heat Pump

May Require the Services of a Professional for Installation

Wireless Internet Access Only Available if Access Equipment Purchased Separately

Runner-up

Koldfront WAC12001W 12,000 BTU Heat/Cool Window Air Conditioner

Koldfront WAC12001W 12,000 BTU 208/230V Heat/Cool Window Air Conditioner

Specifications

Cooling Efficiency (Max SEER): 10.9 EER

Heating Efficiency (max HSPF): N/A

Decibel Level: N/A

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Review

Window air conditioners don’t come in a more dynamic package than this latest entry in the HVAC field from Koldfront. Built to heat or cool smaller spaces in the 450-550 square-foot range, the Koldfront WAC1200 performs smoothly and effortlessly in summer, winter, and every time in between. Control options for this appliance are plentiful and function impeccably, giving users the ability to determine room or area temperatures down to a fraction of a degree.

Bottom Line

The Koldfront WAC1200 sets a formidable standard in the smaller-space heating and cooling category. It offers a plethora of programming options for advanced adaptability, maintaining a desirable temperature level on a daily, nightly, and four-seasons basis.

It is quick and easy to install and well within the budget of the average homeowner or renter. The Koldfront WAC1200 combines precise performance with versatility, making it a winner in the window AC/heat pump category.

Pros

Low-Priced Unit in Comparison to the Competition

Remote Control Included for Hands-Free Operation

Relatively Lightweight for a Window A/C at 88.4 Lbs.

Three Separate Fan Speeds, Plus an Automatic Setting

Four-Way Directional Air Louvers Create Even Air Distribution

24-Hour Timer Allows for Enhanced Temperature Management

Removes Up to 60 Pints of Water Per Day in Dehumidifying Mode

Sleep Mode Modulates Temperatures Overnight to Lower Energy Consumption

Energy-Saver Mode Runs Fan at Two-Minute Intervals and Limits Compressor Activation

Cons

Requires a 220-Volt Connection Rather Than the Standard 115-Volt

Energy-Efficiency Ratings Slightly Below the Most Energy-Efficient Models

Best Suited for Single Rooms or Small Apartments Rather Than Larger Spaces

Best Window Heat Pump 115V

Frigidaire FFRH0822R1 8,000 BTU 115 Volt Air Conditioner/Heat Pump

FRIGIDAIRE 8,000 BTU Window-Mounted Room Air Conditioner with Supplemental Heat

Specifications

Cooling Efficiency (Max SEER): 13

Heating Efficiency (max HSPF): N/A

Decibel Level: N/A

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Review

As a testament to the wonders of smart technology, the Frigidaire FFRH0822R1 has few peers in the climate modification category. It is fully controllable by touch or remote control, with bright digital displays to help you keep track of its functioning.

This air conditioner/heat pump comes with a slide-out chassis that makes it suitable for window or wall installation. Built to heat or cool a 350-square foot area, the Frigidaire FFRH0822R1 features 8,000 BTUs of cooling and 7,000 BTUs of heating capacity. However, the latter is amply boosted by a 3,500 BTU supplemental heating system.

Bottom Line

The Frigidaire FFRH0822R1 doesn’t have the power or range of some other models. But for sheer operating efficiency, it is a best-in-class entry all the way. The additional heating capacity gives it a cold-weather utility that other heat pumps may lack and its multitude of programming options guarantee customized comfort all year round. Your friends and family will flock to the room where the Frigidaire FFRH0822R1 is installed, which says it all about the effectiveness of this reliable appliance.

Pros

More Effective in Winter Than Most Heat Pumps

Is ENERGY STAR Certified for Low-Cost Operation

Remote Control Works for All Functions and Settings

Lightweight Unit at 80 Lbs.Making Installation a Snap

Super-Quiet Appliance Appropriate for Bedroom Installation

Comes With Washable Mesh Filter and ‘Check Filter’ Warning

Includes Energy Saver and Sleep Modes for Attention-Free Efficiency

Eight-Way Directional Control for Personalized Air Flow Management

Automatic Fan Control Adjusts Fan Speed Based on Temperature Variations

Cons

Only One Setting Available in Heat Mode

Somewhat Pricier Than Some Other Options With its Capacity

Decent But Not Fantastic Dehumidification Capabilities (1.5 Pints/Hour)

Some Customer Complaints About Weak Performance in Energy-Saver Mode

Best 12,000 BTU Window Heat Pump

Senville SENL-12CD

Senville SENL-12CD Mini Split Air Conditioner Heat Pump, 12000 BTU 19 SEER

Specifications

Cooling Efficiency (Max SEER): 19

Heating Efficiency (max HSPF): 8.5

Decibel Level: 25 dB

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Review

This highly-efficient mini-split system from Senville is a cut above most of the competition. Its efficiency ratings in both cooling and heating modes are top-end and it is intricately adjustable for both cooling/heating strength and direction of airflow. The Senville SENL-12CD 12,000 BTU Mini-Split is an outstanding entry in Senville’s LETO Series, which is acclaimed for its professional manufacturing and cost-efficient functioning.

Bottom Line

Users almost universally praise the day-to-day performance of this device. It is effective in winter all the way down to freezing, while producing excellent cooling results even during the dog days of July and August. Using the Senville SENL-12CD 12,000 BTU Mini-Split is a nearly effortless affair, since every aspect of its functioning and programming can be controlled or monitored through its hand-held remote. While it is more costly than some models, in the HVAC industry you get what you pay for, as this entry from Senville’s LETO Series so aptly proves.

Pros

Lightweight Package Mini-Split Package at Just 66.1 Lbs.

Outdoor Inverter/Compressor Comes With Five-Year Warranty

Comes With 24-Hour Timer and Sleep Mode for Overnight Usage

Indoor Air Handler Manufactured to Ensure Noise-Free Operation

Runs on 110 Volts, Allowing for Use With Standard Home Outlets

Heats or Cools Up to 550 Square Feet of Living or Working Space

Multidirectional Vents Combined With Three Intensity Settings (Low, Medium, High)

Installation Kit Features 16 Feet of Copper Piping and All Other Necessary Materials

Cons

Airstream From Indoor Unit Can Be Intensely Cold

More Costly Than Other Similar Capacity Heat Pumps

Installation Materials Provided, but Actual Installation Best Left to Professionals

Best 18,000 BTU Window Heat Pump

Senville 18,000 BTU SENA-18HF/Z

Senville Aura Series Mini Split Air Conditioner Heat Pump, 18000 BTU, White

Specifications

Cooling Efficiency (Max SEER): 22.5

Heating Efficiency (max HSPF): 12

Decibel Level: N/A

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Review

With a heating and cooling range of up to 1,000 square feet, the Senville 18,000 BTU SENA-18HF/Z is an ideal choice for heating small homes or entire floors in larger homes. This mini-split system is a high-efficiency offering from Senville’s Aura Series, which, as a group, carries the ENERGY STAR seal of approval. Steady and quiet operation are the calling cards of the Senville 18,000 BTU SENA-18HF/Z, and this model is both easy to install and program.

Bottom Line

The Senville 18,000 BTU SENA-18HF/Z is a wonderful choice for those who prefer whisper-quiet operation plus comprehensive remote programmability. At 18,000 BTUs, it is a potent heater and cooler and will work in wintertime conditions that can cause stress on less robust heat pumps with smaller capacities. The Senville Aura Series is noted for its superior energy-efficiency, and if you are worried about high utility bills this is one mini-split system that will keep your costs down.

Pros

Three Fan Speeds With Low Noise Levels on All

Features Automatic Dehumidification Capacities

Includes Silver Ion Filter With Anti-Microbial Properties

Remote-Controlled With Built-In Thermostat on the Remote

24-Hour Timer for Customized Daily Temperature Maintenance

Vertical Air Louver Swing Function for Precision Air Flow Control

Can Handle Heating and Cooling Loads in up to 1,250 Square Feet of Space

Cons

Might Need Special Electrical Wiring Plus Outlet to Handle 208-230 Volt Plug-In

Installation Kit Included, But an HVAC Technician Should Be Hired to Handle the Job

An Expensive Option in Comparison to Most Other Heat Pumps With Similar Capacity

Best 24,000 BTU Window Heat Pump

Pioneer Mini Split Air Conditioner and Heat Pump

Pioneer Air Conditioner WYS024G-19 Wall Mount Ductless Inverter+ Mini Split Heat Pump, 24000 BTU-208/230V

Specifications

Cooling Efficiency (Max SEER): 17

Heating Efficiency (max HSPF): 9.5

Decibel Level: N/A

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Review

If you’re looking for a heat pump that can handle the load in a medium-sized house or large apartment, this mega-pump from the fine folks at Pioneer can certainly do the trick. At 24,000 BTUs, the Pioneer Mini-Split Air Conditioner and Heat Pump is ready for any challenge 12 months out of the year.

Rated to perform at up to 1,500 square feet, this mini-split system will knock it out of the park time after time. Its energy-efficiency ratings are 16 SEER for the cooling cycle and 9.0 HSPF in heating mode, putting it in the upper echelon as a bank account preserver.

Bottom Line

When you need consistently effective temperature control in an expansive space, the Pioneer 24,000 BTU Mini-Split Air Conditioner and Heat Pump can deliver the goods—and then some. The wireless infrared remote control puts the user in total command of this well-crafted mini-split system, providing exact temperature control plus ventilation and dehumidification as required. An impressive entry in Pioneer’s WYS Series, this unit is the perfect choice for those who need a power-packed heating and cooling system.

Pros

Surprisingly Quiet Operation for a Large-Capacity Unit

Multiple Fan Speeds for Increased Temperature Control

Timer Function Allows for Round-the-Clock Programming

Ultra-High Efficiency Inverter/Compressor With Variable Speeds

Two-Floor Coverage Area in Smaller Homes (up to 900 Square Feet)

Full Installation Kit Included for Connecting Indoor and Outdoor Halves

Night Mode Adjusts Temperatures Automatically Between Sleeping and Waking

Optional Wireless Internet Connectivity Lets Owner Program Unit From Anywhere

Cons

Wireless Internet Module Sold Separately

Too Heavy to Install for Most People Without the Help of a Trained Technician

The 208-230 Volt Power Connection is Not Compatible With Standard Electrical Outlets

What is a Window Heat Pump and What is it Used for?

A window heat pump removes heat from the air and transports it either outside (for cooling) or inside (for heating). The heat is absorbed by a liquid refrigerant that travels through a series of metal coils and it is this refrigerant that ultimately releases that heat. Even when outdoor temperatures plummet, the air still contains a certain amount of heat, which a heat pump can extract and compress into a concentrated form.

Because they have both heating and cooling modes, heat pumps can eliminate the need for an air conditioner and furnace. However, this is only true in relatively small spaces, such as single bedrooms, small apartments, workshops, or garages. They don’t connect to a duct system and therefore cannot distribute air throughout a home.

Window heat pumps lack the sheer power of a furnace or air conditioner. But within their range, they are just as effective.

Types of Window Heat Pumps

Window heat pumps harvest heat energy for import or export directly from the air. This is why they are classified as air-source heat pumps. Ground-source heat pumps use the earth as a source of heat, or as a sink for heat that has been collected from indoors.

Mini-split systems combine the best qualities of a heat pump and traditional air conditioner. They cannot be technically classified as window heat pumps (the indoor unit is mounted on the wall while the compressor is installed outside). However, they are another option for people in the market for window heat pumps, since their function and performance is similar.

What are the Advantages and Disadvantages of a Window Heat Pump?

Window heat pumps generally cost well under $1,000, yet they can still operate efficiently and effectively in both heating and cooling modes. They can eliminate the need for separate air conditioning and heating systems and do not require ductwork to deliver heated or cooled air. In addition to their temperature-controlling capacities, they can also function as dehumidifiers or as fans for ventilation.

The main problem with a heat pump is that they are far more efficient in cooling mode than in heating mode. If you live in an area where winter-time temperatures drop below freezing, you’ll need a back-up heating system of some kind to support your window heat pump.

While window heat pumps are an excellent choice for smaller spaces, most aren’t suitable for large apartments or entire floors of homes. In most cases, you’ll have to choose a mini-split system for that. They can be a fantastic option, however, if you already have a furnace or air conditioner but need some supplemental heating or cooling in certain rooms or spaces.

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Finding the Best Window Heat Pump for Your Home

The window heat pumps and mini-split heat pump/air conditioners we’ve reviewed are high-quality performers. They can effectively heat and cool your home for a reasonable cost. Consequently, you can’t go wrong with any of them.

There are no bad choices here. But you should purchase the heat pump that best fits your budget, your home or apartment size, and your personal home comfort preferences. The choice is yours, and as long as it is an educated one, you won’t come away disappointed.

Photo credit: thespruce.com

People Also Ask

A heat pump can be a mysterious technology for you if you are not into science much, and hence it is only natural that you have a lot of questions regarding it. However, don’t worry. We have tried to answer some of the top questions for you.

Here are some frequently asked questions!

How Does a Heat Pump Work in Cold Weather?

Heat pumps literally pump heat from the air. Outdoor air in wintertime contains a limited quantity of heat, forcing the heat pump to compress it into concentrated form before it is hot enough for indoor heating.

Can You Run a Heat Pump in Cold Weather?

Heat pumps work exceptionally well in cool weather. This covers a range of temperatures down to a few degrees above freezing (35-40 degrees Fahrenheit). However, as temperatures plunge, a heat pump will quickly lose efficiency. At this point, you’ll have to rely on a back-up furnace or heating element to get the job done.

What is a Window Unit Heat Pump?

It is an independent appliance with two basic components. It basically uses refrigeration technology along with electricity to cool or heat your space. One of the components is placed inside your space, and the other one is placed outside. These two units efficiently work together to make your space comfortable.

Why Do Coils Freeze on Window Heat Pump?

The main reason why the coil of your heat pump may freeze is insufficient airflow. If the air is not flowing properly through your unit, the air’s moisture will get trapped and start to freeze on the condenser coils or evaporator.

Are Window Heat Pumps Efficient?

Window heating pumps are some of the most efficient units. They not only ensure efficient cooling but are also very efficient heaters. In addition, they cost less than most AC units. They also don’t need any ductwork and hence are easy to install. To sum it all up, they save you cost in all possible ways.

Can a Heat Pump Heat a Whole House?

A heat pump may be adequate to heat your whole house if you live in a single floor open house. If you have multiple closed rooms and stories in your home, then a heat pump won’t heat your complete house.

How to Clean a Window Heat Pump?

Firstly, you need to clean your outside unit, the condenser, with any foaming agent. Then use a vacuum or brush to remove any leaves or grass parts stuck in your condenser.

Be careful while cleaning the fins of your condenser as they get damaged easily. Also, clean the concrete pad on which your condenser rests.

Then, for the inside unit, which is the evaporator, first, open the access panel and filter to access the coil and then clean it with a coil cleaner. Lastly, close the access panel.

Do Heat Pumps Use a Lot of Electricity?

No, heat pumps are highly efficient units, and hence even though they use electricity, they don’t use a lot of it. This feature makes them highly cost-efficient as they help minimize your electricity bills every month. Furthermore, they use a lot less electricity in comparison to electric heaters. This calculator will show you how much electricity a heat pump uses.



My name is Bob Wells and I am a retired HVAC tech from Washington state. I am currently retired and no longer do much with HVAC, however, I feel like I have a lot of knowledge in the subject and I wanted to create a website where I could talk about what I've learned and help upcoming HVAC techs. Find more info about me and HVAC Training 101.