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5 Best Window Heat Pumps For Reliable Home Heating

Erica Puisis

Written By

Erica Puisis

Expert Reviewed By

Dean Zoet

Last Updated On

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For my clients seeking year-round comfort, especially in single room spaces, I often recommend an AC/heater combo, which are typically listed as window heat pumps.

Wondering which window air conditioner with a heat pump is best? You've come to the right place!

In this complete guide, I'll compare the best window air conditioners with both heating and cooling so that you can choose the right one for your home.

Quick Glance - My Recommendations

LG 23,000 BTU Window Air Conditioner with...

LG LW2423HR

  • Extremely powerful
  • Handles a large coverage area
  • Built with tons of helpful features

LG 7,500 BTU Window Air Conditioner with...

LG LW8021HRSM

  • Good energy efficiency
  • Smart operation with LG ThinQ
  • Compatible with standard 115V plug

Koldfront WTC8001W 8,000 BTU Through the Wall...

Koldfront WTC8001W

  • User-friendly design
  • Washable air filters
  • Works with a standard household outlet

5 Reliable Window ACs With Heating Functions

These 5 products are the best choices for homeowners. I have covered a variety of sizes and styles for all types of windows and rooms.

1. LG LW2423HR (24000 BTU Model)

4.5

Overall Score


Energy Efficiency

4.5

Current Progress
Current Progress
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Cooling Ability

5.0

Current Progress
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Value for Money

4.0

Current Progress
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Who is the LG 24000 BTU best for?

This LG efficient window air conditioner with heat is best for heating large open apartments up to 1,440 square feet.

Pros
  • Extremely powerful
  • Handles a large coverage area
  • Built with tons of helpful features
  • Window mounting kit included
  • Stylish interior panel
CONS
  • Not very energy efficient
  • High price tag

The LG 24K BTU window unit is first on my list of window ACs with heat pumps, and is my top choice for large, open areas. 

It's capable of heating and cooling areas measuring up to 1,440 square feet. I have installed this heat pump for massive rooms and even once for a loft apartment.

There's more to love than just the large coverage area, though. This LG sits stylishly in any window frame and is super easy to use, thanks to its electronic control panel.

You can even operate it from across the room with the included remote control.

LG LW8016HR

In terms of features, this window air conditioner comes with it all, including 2 fan speeds for both cooling and heating, an automatic restart feature, and an easy-to-use window mounting kit.

Important Note:

While this model is easy to install, it is absolutely important that you take proper care when mounting and installing this heavy unit.

Do not attempt to DIY if you are not an expert or have sufficient experience with installing window ACs.

It also features a dehumidifying function, a check-filter alert system, and a washable filter.

Aside from its heavy weight, my coworker and I had no trouble installing the LG and getting it up and running. The large dimensions require a big window and sturdy window sill.

Only try to install it on your own if you're Superman and can lift 145 pounds on your own. (What I'm saying is don't even attempt it.)

Compared to other the other window unit with similar specs on my list (the Koldfront WAC25001W), this LG model is a bit more affordable, offering more value for money.

If you don't need such a large heating device, consider one of the smaller options, like the 8K or 16K BTU models.

Feature

Details

BTU Rating

24,000

Heating Coverage Area

1,440 sq ft

Voltage

230V

Dimensions

25.5"D x 30.5"W x 16.8"H

Warranty

1 year


2. LG LW8021HRSM

4.5

Overall Score


Energy Efficiency

4.5

Current Progress
Current Progress
Current Progress
Current Progress

Cooling Ability

4.0

Current Progress
Current Progress
Current Progress
Current Progress

Value for Money

5.0

Current Progress
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Who is the LG LW8021HRSM best for?

I recommend this LG LW8021HRSM model for those looking for supplemental heat in a bedroom with low noise performance.

Pros
  • Good energy efficiency
  • Smart operation with LG ThinQ
  • Compatible with standard 115V plug
  • Easy to install in window sill
  • Quiet operation at 50dB
CONS
  • Some complaints about inaccurate thermostats

If you don't need a massive window heating unit, the LG 24K BTU device above isn't the one for you.

Luckily, LG window air conditioners with heat cater to all room sizes, and the 7,500 BTU unit is a great AC choice for smaller rooms.

After using this in my 200-square-foot master bedroom during the winter season, I’ve found this unit to be efficient, effective, and easy to use.

It’s rated for rooms up to 320 square feet for cooling and 220 square feet for heating. I only used it to supplement my home furnace, and I think this is the ideal setup.

I especially love this LG’s smart technology. It’s built with patented LG ThinQ Technology, which lets me operate the device remotely from the LG app.[1]

It even works with Alexa and Hey Google, so I can alter the room’s temperature through simple voice commands to my Google system.

LG LW8021HRSM

Other features include a precise thermostat, remote control operation, 24-hour timer, change filter indicator, and energy saver mode to help with overall energy savings.

Similar to the previous LG model, this one comes with an auto restart function as well as a dehumidifying mode.

All in all, this is an excellent choice for heating an average-sized bedroom or office with a budget heat pump.

If you want to heat a space that's larger than 220 square feet, you'll have to consider a more powerful wall unit, like the LG LW2423HR.

Feature

Details

BTU Rating

7,500 BTU (cooling)/3,850 BTU (heating)

Heating Coverage Area

220 sq ft

Voltage

115V

Dimensions

18"D x 21"W x 14"H

Warranty

1 year


3. Koldfront WTC8001W

4.4

Overall Score


Energy Efficiency

4.5

Current Progress
Current Progress
Current Progress
Current Progress

Cooling Ability

4.3

Current Progress
Current Progress
Current Progress
Current Progress

Value for Money

4.5

Current Progress
Current Progress
Current Progress
Current Progress

Who is the Koldfront heat pump best for?

This Koldfront air conditioner with heat is perfect for those looking for a permanent installation with a through the wall model.

Pros
  • User-friendly design
  • Washable air filters
  • Works with a standard household outlet
  • Remote control included
  • Designed with 3 fan speeds
CONS
  • Short warranty period
  • Window mounting kit not included

When I have a client who is looking for something they can have installed year-round, I usually recommend a through-the-wall AC/heater combo that won't take up any window space.

The Koldfront WTC8001W is a wildly popular model through-the-wall unit. I have seen a few installs of this one in regular windows, but I don't recommend it. 

For cooling, the Koldfront has a cooling power of 8K BTU, which can handle up to 350 square feet.

Koldfront WTC8001W

The heating mode operates at 4,200 BTU, which is more suitable for about 250 square feet. It’s not ideal for a massive space, but it’s great for a bedroom or small living area. Again, these units are great for supplemental heating.

The WTC8001W comes with all the features you need for user-friendly operation.

It includes washable air filters for easy maintenance, a remote control, electronic touch controls, and compatibility with a standard-size plug.

Koldfront offers a 2 year warranty on this model, which is really nice, and is twice as long as what most brands like LG offer.

Just know that it doesn't come with the required through-the-wall sleeve, so you'll have to purchase that separately.

Feature

Details

BTU Rating

8,000 (cooling), 4,200 (heating)

Heating Coverage Area

250 sq ft

Voltage

115V

Dimensions

20"D x 24"W x 14.5"H

Warranty

2 Years


4. Koldfront WAC25001W 

4.3

Overall Score


Energy Efficiency

4.5

Current Progress
Current Progress
Current Progress
Current Progress

Cooling Ability

4.5

Current Progress
Current Progress
Current Progress
Current Progress

Value for Money

4.0

Current Progress
Current Progress
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Who is the Koldfront WAC25001W best for?

These Koldfront window units are best for those seeking heating efficiency over cooling systems.

Pros
  • Mounting assembly/installation hardware included
  • Powerful enough to heat 700 sq ft
  • Easy to operate and maintain
  • Long 2-year warranty period
CONS
  • Expensive
  • 220V outlet required

If sheer power is your main concern when shopping around for heat pump units, look no further than the WAC25001W window air conditioner with heat from Koldfront.

This 25,000 BTU is nearly as powerful as a central air heating system, and it’s less than $900.

In terms of square footage, the cooling capacity of this Koldfront air conditioner is a whopping 1,500 square feet - that’s even higher than the LG LW2423HR.

Thanks to the integrated heat pump, you can expect to heat a room as large as 700 square feet.

The WAC25001W isn’t your basic air conditioner.

Koldfront WAC25001W

In addition to powerful yet efficient heating, this device is designed with three fan speeds, four operation modes, remote control operation, a 24-hour timer, washable filters, and moisture removal of up to 137 pints of water per day.

While this is the best window heat pump for anyone looking for a powerful heating element, it's not for everyone.

Because of its size and impressive supplemental heat capability, it's more expensive than my top choice, the LG LW2423HR, and the cost isn't necessary if you just need a small heat pump window unit.

Feature

Details

BTU Rating

25,000 BTU (cooling)/16,000 BTU (heating)

Heating Coverage Area

700 sq ft

Voltage

220V

Dimensions

26.5"D x 26.5"W x 18.6"H

Warranty

2 years


5. Keystone KSTAW12INV

Most Energy Efficient

4.2

Overall Score


Energy Efficiency

4.5

Current Progress
Current Progress
Current Progress
Current Progress

Cooling Ability

4.0

Current Progress
Current Progress
Current Progress
Current Progress

Value for Money

4.0

Current Progress
Current Progress
Current Progress
Current Progress

Who is the Keystone 12,000 BTU model best for?

The Keystone 12,000 BTU model is best for those focused on energy savings and efficient cooling and heating.

Pros
  • Lighter than most at 57 lbs
  • Low noise levels, 45dB minimum
  • Most energy-efficient AC with heat
  • Easy maintenance with washable filter
  • Great value for money
CONS
  • Extremely popular, so not always available
  • Not available for California residents

So far, I've covered several efficient window heating air conditioners. Still, none of them compare to the Keystone Window AC when it comes to efficient operation.

This device is Energy Star certified, and it's been proven to help save on energy costs.

This model has a 12,000 BTU cooling capacity and a slightly lower heating capacity of 10,000 BTU.

It's designed for areas up to 550 square feet and can heat in temperatures as low as 41 degrees Fahrenheit. This is the AC/heater combo I recommend for people who need something a bit more powerful than the LG LW8021HRSM.

Keystone KSTAW12INV

Thanks to its energy-saver mode, this heating air conditioner doesn’t cost much to operate.

According to Keystone, it has a CEER of 13, and it costs only $68 to run the heat each year, assuming you’re using the device for 8 hours/day.

Aside from its impressive efficiency, I love the versatility of the Keystone air conditioner.

It features 5 different modes, including cooling, heating, fan only, dehumidifying, and auto mode.

It also features a four-way directional airflow, a washable air filter, a programmable timer, and a complete window installation kit.

I will say that because this is such a popular model offered at an affordable price, it’s not always available.

Retailers run out of stock pretty frequently, so if you’re buying this on Sylvane and it’s not currently available, I suggest adding your email to receive a notification as soon as it’s back in stock.

Feature

Details

BTU Rating

12,000 BTU (cooling)/10,000 BTU (heating)

Heating Coverage Area

550 sq ft

Voltage

115V

Dimensions

22” D x 19”W x 13”H

Warranty

1 year


Comparing The Features of Window Heat Pumps

Preview

Name

Rating

BTU Cooling

BTU Heating

Heating Area

Price

LG 23,000 BTU Window Air Conditioner with...

LG LW2423HR

4.5

24,000

12,000

1,440 sq ft

LG 7,500 BTU Window Air Conditioner with...

LG LW8021HRSM

4.5

7,500 

3,850 

220 sq ft

Koldfront WTC8001W 8,000 BTU Through the Wall...

Koldfront WTC8001W

4.4

8,000

4,200

250 sq ft

Koldfront WAC25001W 208/230v 25,000 BTU...

Koldfront WAC25001W

4.3

25,000 

16,000

700 sq ft

Keystone 12000 BTU AC with Heater

Keystone 12,000 BTU

4.2

12,000 

10,000

550 sq ft

Factors To Consider When Choosing a Window AC Heat Pump

Also see - Full guide on how to choose a window AC heat pump.

What is the Coverage Area (BTU Vs Square Footage)

Before considering anything else, it’s important to think about the square footage of the area you’re hoping to heat.

Whether it’s a portable air conditioner or a window AC, the BTU rating will tell you exactly what the appliance is capable of, specifically when it comes to coverage area.

BTU, short for British Thermal Unit, is the quantity of heat required to raise the temperature of water by 1°F at the temperature which water has its greatest density.

HEATING AND COOLING CAPACITY

This definition is extremely complicated, so if you’re not a science whiz, just know that the greater the BTU rating, the greater the capacity for heating or cooling.[2]

Compare the LG 24,000 BTU model to the smaller 7,500 BTU device to see what I mean.

The higher-BTU device can heat a space of 1,440 square feet. The 7,500 BTU AC, on the other hand, is rated for no more than 220 square feet.

What is the Unit's Cooling & Heating Capacity?

First and foremost, these window air conditioners are geared towards cooling, so consider the importance of the cooling function before making a decision.

If heat is your main concern, then you don't have to worry too much about the cooling capabilities of the AC you choose.

If you want to use the appliance in the summer as well, pay close attention to the cooling aspects of the unit.

Useful Note:

The heating capacity is usually lower than the cooling capacity when it comes to a window heat pump.

Take the LG LW8021HRSM as an example; it has a cooling capacity of 7,500 BTU and a lower heating capacity of 3,850 BTU.

How Energy Efficient is the Model?

A window AC unit with a heat pump has two separate ratings for efficiency - one for heating and the other for cooling.

For heating, look for the Heating Seasonal Performance Factor (HSPF).[3]

Generally speaking, HSPF ratings of 9.0 or greater are considered efficient, and you're likely to save energy costs by using this as a supplemental heat source in your home.

Cooling efficiency has another rating altogether - the Seasonal Energy Efficiency Ratio (SEER). In this case, a rating of 15 or greater will help you save on your energy bills.

SEER and HSPF

To increase your chances of lowering energy costs, choose a unit with an Energy Star Certification, like the Keystone 12K BTU air conditioner.

Window AC heat pumps with an Energy Star rating use 20 to 50% less energy than other units on average.

Useful Note:

Generally, heat pumps for cooling are less efficient as compared to traditional ACs without a heater function.

Is the Unit easy to Install?

Window air conditioners with heating functions are notoriously easy to install, especially when they come with mounting kits and installation hardware, like the LG LW8016HR.

The most difficult part of installation is lifting the unit into the window frame, so you’ll need an extra set of hands for this. A smaller heat pump would be easier to install in comparison to a large more heavier one.

Be aware of the power requirements for heating rooms. For heat pump models with a BTU rating of 18,000 or less, you can use a standard 115-volt plug.

For anything greater than 18K BTU, like the LG LW8016HR or the Koldfront WAC25001W, you'll need access to a 230-volt connection.

Is Upfront Cost Too High?

These window units are all across the board when it comes to price. You can find one for less than $500, but more powerful air conditioners can cost upwards of $2000.

For heat pump models, price is determined by a few things, but it mainly concerns the BTU rating.

More BTUs means a higher price tag, which explains why the Koldfront WTC8001W 8,000 BTU AC costs considerably less than the Koldfront WAC25001W 25,000 BTU system.

Other Factors To Consider

Over the years, I’ve noticed some major changes to cooling and heating technology.

Thanks to innovations, I can now use a smart air conditioning system that allows me to remotely control my home’s temperature from my phone.

The perfect example of a smart air conditioning is the LG 7,500 BTU system.

This specific model is WiFi-enabled and compatible with LG’s ThinQ Technology, so I can control its functions through my Hey Google device.

In addition to smart features, here are a few more things to look for when buying a heat pump air conditioner:

  • Auto-restart: After power failure, the unit should restart when the power is restored.
  • Automatic timer: Auto timers allow users to set a specific time for the heating element to power on and shut off.
  • Programmable thermostat: You should be able to set your desired temperature with ease.
  • Remote control: It’s always nice to be able to control the unit from the bed or couch.
  • Filter indicator: An indicator light will tell you when it’s time for filter replacement or cleaning.
  • Multiple fan speeds: Some units have three fan speeds for more effective heating.
  • Electronic touchpad: Look for a heat pump air conditioner that features a comprehensive touchpad control panel so that you can easily adjust the settings and temperature.

Comparing Window Vs Mini-Split Heat Pumps

Before buying an air conditioner with heat, it’s always a good idea to weigh your options.

While window heat pump units are ideal for some people, a mini-split supplemental heat pump might be the better choice for you.

Want to know which type - window vs mini-split - is the better option for you? Here’s a quick breakdown of each type’s standout features:

Feature To Consider

Window Heat Pumps

Mini-Split Heat Pumps

Installation

Window air conditioning units are a breeze to install, and hiring a professional HVAC tech is unnecessary.

Installing a mini-split air conditioner can be complicated, so you'll probably have to pay for professional installation.

Energy Efficiency

In general, window units are less energy-efficient. They have a fixed compressor speed that cannot be adjusted.

Mini-split heat pump models use inverter technology to regulate the power needed to cool the air, making them extremely efficient on energy.

Coverage Area

Window air conditioners come in many sizes and feature a wide range of BTU ratings. For this reason, they can be used in small rooms, large rooms, and even entire apartments.

Mini-split units can be used to cool multiple rooms or even an entire house, depending on the size of the unit you choose.

Upfront Cost

Window air conditioner prices vary across the board. You can find a small room window air conditioner for a few hundred bucks, which is much cheaper than the average mini-split cost.

It’s very unlikely that you’ll find a mini-split air conditioner for less than $800. On average, these units cost a few thousand.

There’s no clear winner between window heat pumps and mini-split heat pump units. Your choice comes down to your heating and cooling needs, budget, and overall preferences.

Overall, mini-splits are more energy efficient and great for cooling multiple rooms in the home.

However, window AC units are cheaper upfront, easier to install, and ideal for providing supplemental heat to a single room.


FAQs

How Much Does it Cost to Operate a Window Heat Pump?

The cost to operate a window heat pump depends the size of the unit, the BTU rating, the heat setting you choose, and the specific model. Assuming the electricity rate is about $0.15/kWh and you run the window AC with heat pump for 8 hours daily, a small unit will only set you back about $20/month. A larger unit can cost as much as $90/month.

How Do Window Heat Pumps Work?

Window heat pumps work by drawing in air from the outside. This cool air passes through a coil and refrigerant to heat up, and the heated air is blown into the indoor space.

How Can I Tell if My Window Air Conditioner Has a Heat Pump?

There are a few ways to tell if your window air conditioner has a heat pump. You can find the serial number on the unit’s sticker and look it up online, or check the energy guide label to see if it has an official Heating Seasonal Performance Factor (HSPF). Another option is to check the unit for a heat pump reversing valve, which will be located on the condenser portion of the unit.

What is the Most Reliable Heat Pump Brand?

There are tons of heat pump brands to choose from, but the most reliable devices come from reputable brands like LG, Koldfront, and Keystone.

So, Which Is The Right Window Heat Pump For You?

It’s difficult to say which product is the best window air conditioner with heating capabilities.

That’s because it all depends on YOU. More specifically, it depends on the size of the room you’re trying to heat and the features you’re looking for.

If you need to heat a large space, go with the LG LW2423HR AC or the Koldfront WAC25001W.

For a more efficient window air conditioner, consider the Keystone 12K unit instead.

My #1 Recommendation
LG LW2423HR

  • Extremely powerful
  • Handles a large coverage area
  • Built with tons of helpful features
  • Window mounting kit included
  • Stylish interior panel

References: 

  1. https://www.lg.com/us/lg-thinq
  2. https://www.eia.gov/energyexplained/units-and-calculators/british-thermal-units.php
  3. https://www.energy.gov/sites/prod/files/guide_to_home_heating_cooling.pdf
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Erica Puisis

Writer

Erica Puisis
Erica's work has been featured in top digital publications such as Forbes, The Spruce, MyDomaine, and U.S. News & World Report. When she's not knee-deep in HVAC specs or testing the latest smart thermostat, you'll find her trying new coffee shops or at the local farmers market.

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