Heat Pumps: The Complete Homeowner's Guide

A heat pump doesn't actually "generate" heat like a gas furnace does by burning fuel. Instead, it moves heat from one place to another using electricity and refrigerant.

In the summer, it acts exactly like a traditional air conditioner—it absorbs heat from inside your house and pumps it outside. In the winter, it reverses this refrigeration cycle. It absorbs ambient heat energy from the cold outside air (yes, there is heat energy even in freezing air!) and pumps it inside your home.

Because moving heat is much easier than generating it, heat pumps can be up to 300% more efficient than traditional electric resistance heating.

• Air-Source (Ducted): The most common. Replaces a standard central AC and uses your existing ductwork.
• Mini-Split (Ductless): Consists of an outdoor unit and wall-mounted indoor units. Perfect for homes without ducts or for room additions.
• Ground-Source (Geothermal): Extremely efficient but very expensive upfront. Uses the constant temperature of the earth rather than the outside air.
• Water-Source: Uses a nearby body of water as the heat exchange medium (rare for residential).

Historically, heat pumps struggled when temperatures dropped below 30°F. This is no longer true.

Modern cold-climate heat pumps (using inverter-driven variable-speed compressors) can extract heat from air as cold as -15°F (-26°C). Systems like Mitsubishi Hyper-Heat, Bosch IDS, and Daikin FIT are designed specifically for freezing climates.

However, below 5°F, their efficiency drops and they rely on electric heat strips (which use a lot of electricity), making them more expensive to run during extreme cold snaps.

A "Dual Fuel" system pairs a heat pump with a gas furnace instead of an electric air handler. It's often the most economical setup for cold climates.

• When it's above 35°F, the heat pump runs. It's cheaper and more efficient than burning gas.
• When the temperature drops below freezing and the heat pump loses efficiency, the system automatically switches to the gas furnace to blast hot air.

This gives you the best of both worlds: ultra-efficient cooling and heating for 80% of the year, with powerful gas heat for the dead of winter.

SEER2 (Cooling Efficiency): Seasonal Energy Efficiency Ratio. Look for a minimum of 15.2, but 18+ is ideal for hotter climates.

HSPF2 (Heating Efficiency): Heating Seasonal Performance Factor. The higher the number, the better it heats efficiently over a season. Minimum is 7.5, aim for 8.5+.

COP (Coefficient of Performance): A snapshot of efficiency at a specific temperature. A COP of 3 means it outputs 3 units of heat for every 1 unit of electricity used.

Switching from gas heating to an all-electric heat pump isn't always cheaper to operate — it depends heavily on your local gas vs electricity rates.

Where heat pumps save money: The Southeast, Mid-Atlantic, and Pacific Northwest, where electricity is cheap relative to gas and winters are moderate. A heat pump can cut heating costs by 30–50% compared to a gas furnace.

Where it's a toss-up: The Midwest and Northeast, where natural gas is cheap but electricity is expensive. A dual fuel system is often the smarter financial play here.

The honest math: A heat pump with a COP of 3.0 uses 1 kWh of electricity to produce the same heat as roughly 0.03 therms of gas. If electricity costs $0.15/kWh, that's $0.15 for the same heat that $0.03 × your gas rate would cost. In many regions, gas is still cheaper per BTU — but the gap is closing as gas prices rise and heat pump efficiency improves.

Don't forget: even if operating costs are similar, the federal tax credit and rebates can offset the higher upfront cost by $2,000–$8,000.

The Inflation Reduction Act (IRA) made heat pumps incredibly attractive:

• 25C Tax Credit: Anyone can claim 30% of the installation cost as a tax credit, up to $2,000. Claim on IRS Form 5695.
• HEEHRA Rebates: Low-income households (<80% Area Median Income) can get up to $8,000 off upfront. Moderate-income (80-150% AMI) can get up to $4,000 off. The total program cap is $14,000.
• ENERGY STAR Certification: Only ENERGY STAR certified equipment qualifies for federal incentives.

Many local utility companies also offer $500 to $2,000 in instant rebates for switching from gas to electric heat pumps.

How to find your state's program administrator: Visit dsireusa.org or your state energy office website. Each state administers HEEHRA rebates differently.

Timeline: A standard replacement takes 1–2 days. New installations with ductwork modifications or electrical panel upgrades can take 3–5 days.

What they'll do: Remove the old system, set a new outdoor unit on a pad, connect refrigerant lines, install or connect the indoor air handler, run a vacuum and charge the system, test heating and cooling modes, and program the thermostat.

Questions to ask your contractor:

• Will you perform a Manual J load calculation before sizing the system?
• Is my electrical panel sufficient, or will it need an upgrade?
• What SEER2 and HSPF2 ratings does this unit have?
• Will you handle the permit and inspection?
• What's included in the warranty — parts, labor, and for how long?
• Will you file the rebate and tax credit paperwork?

What you do (monthly/quarterly):

• Change or clean the air filter every 1–3 months
• Keep the outdoor unit clear of debris, leaves, and snow (2 ft clearance)
• Keep indoor vents open and unblocked
• Listen for unusual sounds — rattling, grinding, or hissing

What a tech does (twice yearly):

• Check refrigerant charge and test for leaks
• Clean evaporator and condenser coils
• Inspect and tighten electrical connections
• Test the defrost cycle (critical for heat pumps)
• Lubricate moving parts and check the reversing valve

Cost: A maintenance contract typically runs $150–$400/year and usually includes one or two tune-ups plus priority service and parts discounts.

• Heat pump blowing lukewarm air in heat mode: Normal — heat pumps don't produce 120°F air like furnaces. Air at 90–100°F is typical. If it feels cold, check the thermostat setting or call for a refrigerant check.
• Outdoor unit covered in ice: Light frost is normal in winter — the defrost cycle handles it. If the entire unit is encased in ice, the defrost cycle may be failing. Call a tech.
• System runs constantly: In moderate weather this is normal for variable-speed systems — they run at low speed continuously for maximum efficiency. If it runs full blast constantly, something is wrong.
• Strange noises at startup: A "whooshing" sound when the reversing valve switches between heat and cool modes is completely normal.
• Higher electric bills than expected: Check if the backup heat strips are running excessively. This usually means the system is undersized, the refrigerant is low, or the thermostat emergency heat setting is on.
• System won't switch to heat mode: The reversing valve may be stuck or the thermostat may not be set correctly. Try switching to cool and back to heat. If still stuck, call a tech.

• 1. Mitsubishi: The gold standard for ductless mini-splits and cold-climate Hyper-Heat technology. Whisper-quiet, incredibly efficient, but premium pricing. Best for: ductless applications and extreme cold climates.
• 2. Daikin: The world's largest HVAC manufacturer. Their inverter technology is excellent. Owns Goodman/Amana and makes systems at every price point. Best for: whole-home ducted heat pump systems.
• 3. Bosch: The best value in variable-speed heat pumps. Their IDS system pairs with almost any indoor air handler. Best for: homeowners who want high-end performance without premium brand pricing.
• 4. Carrier: The Infinity series is excellent, with Greenspeed inverter-driven compressors. Massive dealer network and strong warranties. Best for: homeowners who value brand heritage and dealer support.
• 5. Trane: Built like a tank. The XV20i is one of the highest-efficiency ducted heat pumps available. Cons: expensive and the dealer network can be hit-or-miss.
• 6. Lennox: The XP25 is ultra-efficient but proprietary — you must use Lennox dealers for parts and service. Best for: buyers near a good Lennox dealer.
• 7. Rheem: Solid mid-range option. Fewer bells and whistles but reliable and affordable. Best for: budget-conscious buyers and dual-fuel setups.