Pros and cons of air source heat pumps

This is where heat pumps truly stand apart from the competition. Unlike a standard furnace that burns fossil fuels to generate heat, an air-source heat pump moves heat from outdoor air into your home. That distinction matters a lot for efficiency.

According to the U.S. Department of Energy, a properly installed air source heat pump can deliver two to four times more heat energy than the electrical energy it consumes. Compare that to even the most efficient gas furnaces, which convert just under one unit of fuel into one unit of heat, and you quickly realize why people say heat pumps deliver "300% to 400% efficiency."

Higher efficiency translates directly into lower fuel consumption, a smaller carbon footprint, and lower energy bills over time.

Using less fuel helps you save on your overall energy costs. The amount you can save depends on several factors, including your existing heating or cooling source, the type of heat pump you install, where you live, and your electricity cost.

According to a 2024 study, the majority of homeowners see utility bill savings with a heat pump, with the likelihood increasing based on efficiency. For example, 62% of homes that installed a minimum-efficiency heat pump saw bill savings, compared to 95% of homes that installed a high-efficiency cold-climate heat pump.

More dated research from the Northeast Energy Efficiency Partnerships (NEEP) found that homeowners who switch to heat pumps in the Northeast and Mid-Atlantic regions save roughly $459 annually compared to electric resistance heaters and $948 annually compared to oil furnaces (and heat pump efficiency has only increased since this study was released).

Now, if you install a home solar panel system, you're almost guaranteed to save money with a heat pump if your solar panels generate enough electricity to power it. Once you break even on your solar panel system, your heat pump will run on free electricity. More on solar later.

If you've ever had one part of your home that's always too warm while another stays stubbornly cold, zoned heating and cooling is a game-changer. Ductless mini-split systems allow you to set different temperatures in different rooms or zones. You can keep bedrooms cooler at night without freezing out the living room, or simply stop paying to condition rooms you're not using. That kind of precision can add up to meaningful energy savings over time.

Air source heat pumps, particularly ductless mini-splits, operate quietly compared to most traditional HVAC systems. Many models run at roughly 50 decibels outdoors and just 20 to 40 decibels indoors—about as loud as a whisper. For context, a standard window AC or dishwasher typically runs around 60 dB.

Beyond noise, heat pumps have actually been proven to reduce health risks, according to Anna Keleher, Senior Advisor at the Behavioural Insights Team (BIT) Americas, who has conducted many research studies on the appliance.

"We know heat pumps can reduce people’s exposure to leaking pollutants like carbon monoxide. They can also improve indoor air quality by adding air filtration and reducing humidity, which can lower the likelihood of mold growth. So overall, just improving the environment within a home," Keleher told Energy Sage.

Heating and cooling with electricity—especially as the grid gets cleaner—is significantly better for the environment than burning fossil fuels directly. In regions where the grid already draws heavily on renewables, heat pump heating produces substantially fewer greenhouse gas emissions per unit of heat than a gas furnace. As your local grid continues to add renewable energy, the environmental benefit of your heat pump only grows over time. The same can't be said for a furnace burning natural gas or oil.

There's no getting around it: Air source heat pumps typically cost more upfront than a standard furnace or window AC. Based on EnergySage data, a ducted heat pump installation averages $14,529 before incentives, while a ductless system averages $25,957. Hybrid systems—which pair a heat pump with a gas furnace backup—average $14,353.

For comparison, a gas or electric furnace typically costs between $4,000 and $10,000 installed, based on various sources.

But there's an important note here: Heat pumps replace both your heating and cooling in one go—the combined cost of replacing a furnace and AC is reportedly between $11,500 and $14,100—far more comparable to the cost of a heat pump install.

Plus, once you factor in heat pump incentives (more on those below), and potential savings on energy bills, the gap closes even further over the life of the system.

Heat pumps run on electricity. If your home currently uses natural gas for heating, switching to an ASHP will probably increase your electric bill, even though your gas bill disappears or shrinks. In areas where electricity is significantly more expensive than natural gas, this tradeoff can reduce your overall savings—and in some cases, the math may not pencil out at all (unless you also invest in solar panels).

So really, it depends. If you're replacing oil, propane, or electric resistance heat, you'll likely save money overall. If you're replacing efficient natural gas heat in an area with very low gas prices and high electricity rates, the economics are less clear. Talking to a local HVAC professional and comparing your specific utility rates is the best way to get an accurate picture.

Air source heat pumps need electricity to run—so if the grid goes down, so does your heat and cooling. This is also true of gas furnaces with electric ignition and controls, so it's not unique to heat pumps. But it's worth knowing, especially if you live in an area prone to outages.

The best solution is pairing your heat pump with a solar-plus-storage system. With a home battery, you can run your heat pump off stored solar energy during an outage and maintain comfortable temperatures even when the grid is down.

Older air source heat pumps struggled in very cold climates, losing efficiency and capacity as temperatures dropped below freezing. This led many homeowners in the Northeast and Upper Midwest to assume heat pumps weren't an option for them.

That's largely no longer the case. Cold-climate heat pumps are now designed to operate efficiently at temperatures well below 0°F—some even as low as -23°F.

If you live somewhere that regularly sees subzero temperatures, a cold-climate model—or a hybrid system that adds a gas furnace as a backup—is worth looking into.

If your home doesn't have existing ductwork, a ducted heat pump installation can be complex and expensive. Ductless mini-split systems are a common workaround, but they require mounting indoor units on walls or ceilings in each room or zone, which involves drilling and running refrigerant lines through walls. It's less invasive than adding full ductwork, but it's not invisible either.

For older homes or those with limited wall space, the aesthetics and installation complexity are real considerations.