Heat Pumps Explained: Costs, Savings, and What No One Tells You

Heat pumps are the most talked-about HVAC technology in America right now. The Inflation Reduction Act put up to $8,000 in federal incentives on the table. Manufacturers are advertising 300% to 400% efficiency. Contractors are pushing them as replacements for gas furnaces. And homeowners are confused — understandably — about whether the hype matches reality.

Here's what heat pumps actually do, what they actually cost, and when they actually make sense.

How Heat Pumps Work

A heat pump doesn't generate heat. It moves it. In winter, it extracts heat from outdoor air (or the ground) and moves it inside. In summer, it reverses and works like an air conditioner, moving heat from inside to outside. This is the same basic technology as your refrigerator, scaled up.

The efficiency claim is real: because a heat pump moves heat rather than creating it by burning fuel, it can deliver 3 to 4 units of heating energy for every 1 unit of electricity consumed. That's what manufacturers mean by "300% to 400% efficient." A gas furnace, by comparison, is 80% to 96% efficient — it loses 4% to 20% of the energy in the fuel as waste heat up the flue.

Air Source vs. Ground Source

Air Source Heat Pumps (ASHP)

Air source heat pumps are by far the most common type. They look like a standard air conditioning condenser — a metal box with a fan sitting outside your house. Modern cold-climate models (Mitsubishi Hyper-Heat, Daikin Aurora, Bosch IDS) can operate efficiently down to -15F to -22F, depending on the model.

Installation cost: $4,000 to $12,000 for a ducted central system. $3,000 to $6,000 per zone for a ductless mini-split.
Best for: Most single-family homes, especially those replacing an aging AC unit or an AC plus gas furnace combination.
Lifespan: 15 to 20 years with proper maintenance.

Ground Source (Geothermal) Heat Pumps

Ground source heat pumps use the earth's constant underground temperature (50F to 55F year-round in most of the US) as their heat source in winter and heat sink in summer. They require buried loop systems — either horizontal trenches or vertical boreholes — which drives up the installation cost substantially.

Installation cost: $15,000 to $25,000 or more, depending on soil conditions, lot size, and loop configuration.
Best for: New construction where trenching is already happening, large properties with room for horizontal loops, or extreme climates where air source efficiency drops.
Lifespan: 20 to 25 years for the heat pump unit. 50+ years for the ground loop.
Efficiency: 400% to 500%, the highest of any heating system.

For most existing homes, air source is the practical choice. Ground source makes financial sense mainly when the installation cost can be amortized over a new build or major renovation, and when utility rates are high.

Real Operating Costs vs. Gas Furnace

The operating cost comparison depends entirely on your local electricity and gas prices. Here's the math for a typical 2,000-square-foot home in a cold climate (heating-dominant, 6,000 heating degree days):

Gas Furnace (96% AFUE)

Annual heating energy: ~60 million BTU
Gas consumption: 625 therms (at 96% efficiency)
Cost at $1.20/therm: $750/year
Cost at $1.80/therm: $1,125/year

Air Source Heat Pump (COP 3.0 average, cold climate)

Annual heating energy: ~60 million BTU
Electricity consumption: ~5,860 kWh (at COP 3.0)
Cost at $0.12/kWh: $703/year
Cost at $0.18/kWh: $1,055/year
Cost at $0.25/kWh: $1,465/year

The takeaway: At average US electricity rates ($0.12 to $0.16/kWh), a heat pump costs about the same or slightly less to operate than a gas furnace. At higher electricity rates ($0.20+/kWh, common in New England and California), a heat pump can cost more to operate than gas unless you're on a time-of-use plan or generating your own solar electricity.

Where heat pumps win decisively is the combined heating-and-cooling comparison. A heat pump replaces both your furnace AND your air conditioner. If you're replacing both systems anyway, the incremental cost of a heat pump over a new furnace + AC is often only $2,000 to $4,000 — and the incentives can cover that entirely.

Cold Climate Performance: Myths vs. Reality

The biggest objection to heat pumps is cold weather performance. Here's what's true and what isn't.

Myth: Heat Pumps Don't Work Below Freezing

This was true of heat pumps manufactured before 2010. Modern cold-climate heat pumps (look for the ENERGY STAR Cold Climate designation) operate at rated capacity down to 5F and continue producing heat at reduced capacity down to -15F or lower. The Mitsubishi Hyper-Heat line is rated to -13F. The Bosch IDS 2.0 maintains full capacity to 5F.

Reality: Efficiency Drops as Temperature Drops

A heat pump that delivers a COP of 4.0 at 47F might deliver a COP of 2.5 at 17F and a COP of 1.5 at -5F. It still works, but it's using more electricity per unit of heat. This is why the annual average COP matters more than the peak COP, and why sizing the system correctly for your climate is critical.

Reality: You May Need Backup Heat

In climates where temperatures regularly drop below 0F for extended periods (northern Minnesota, northern Maine, Montana), most contractors recommend keeping a backup heat source — either electric resistance strips built into the heat pump air handler or retaining an existing gas furnace as a dual-fuel system. The heat pump handles 80% to 90% of heating hours; the backup covers the coldest extremes.

IRA Incentives: Up to $8,000

The Inflation Reduction Act (IRA) created two separate incentive programs for heat pumps:

25C Tax Credit (Available Now)

A 30% tax credit on the cost of a qualifying heat pump, capped at $2,000 per year. This covers the equipment and installation labor. There is no income limit. You can claim it every year if you make qualifying improvements in multiple years.

Home Energy Rebates (State-Administered)

The IRA allocated $4.5 billion to states for two rebate programs:

HOMES Rebates: Up to $8,000 for a heat pump for low- and moderate-income households (below 80% of area median income). Up to $4,000 for middle-income households (80% to 150% AMI). Not available for households above 150% AMI.
HEAR Rebates: Up to $8,000 specifically for heat pump equipment and installation for low-income households. These are point-of-sale rebates, meaning the discount is applied at purchase, not on your tax return.

Rollout is state by state. As of 2026, most states have launched their programs, but funding is limited and first-come, first-served. Check your state energy office for current availability. You can stack the tax credit with state rebates in most cases.

When a Heat Pump Doesn't Make Sense

Your gas furnace is new and working well. If you replaced your furnace in the last 5 years and it's 95%+ efficiency, the operating cost savings from switching to a heat pump won't justify the $5,000 to $10,000 investment for years. Wait until your furnace reaches end of life.
Very high electricity rates with cheap gas. If you're paying $0.25/kWh for electricity and $0.80/therm for gas, a heat pump will cost more to run than a modern gas furnace. Unless you're adding solar to reduce your electricity cost, the math doesn't work.
No existing ductwork and no budget for it. Installing new ductwork runs $3,000 to $7,000. Ductless mini-splits are an alternative, but they cost $3,000 to $6,000 per zone — whole-house coverage can exceed $15,000.
You only need cooling. If you live in a warm climate where heating demand is minimal, a standard high-efficiency air conditioner costs less upfront and does the same cooling job. The heat pump premium only pays off when you use it for both heating and cooling.
Undersized electrical panel. Heat pumps require 30 to 60 amp circuits. If your electrical panel is at capacity (common in older homes with 100-amp service), you may need a panel upgrade ($1,500 to $3,000) before the heat pump can be installed.

Questions to Ask Your Contractor

What is the rated COP at 5F and at 47F for the model you recommend?
Is this an ENERGY STAR Cold Climate certified unit?
Do I need backup heat, and if so, what type?
What is the total installed cost, and what incentives am I eligible for?
Will my electrical panel support this system, or do I need an upgrade?
What is the estimated annual operating cost compared to my current system?

Bottom Line

Heat pumps are the most efficient heating and cooling technology available. They make the strongest financial case when you're replacing both a furnace and an air conditioner at end of life, when electricity rates are reasonable, and when you can capture the IRA incentives. They're not a good investment when gas is cheap and your furnace is new, or when electricity rates are exceptionally high. Run the operating cost comparison with your actual local rates, not national averages. The right answer depends on your utility bills, not on marketing claims.