Choosing a heat pump comes down to five decisions made in order: the distribution type, the size, the efficiency tier, the cold-weather rating, and the budget. Get these right and the rest is model shopping.
Step 1: ducted or ductless
Start with how the heat will move. ENERGY STAR notes that mini split, or ductless, heat pumps are specifically designed for homes or sections of homes that do not have ductwork, while ducted systems connect to conventional forced-air ductwork. ENERGY STAR flags ductless as the fit for older homes with no existing ductwork and for additions or outbuildings where extending ductwork is difficult. If your home has good ducts, a ducted system keeps everything hidden and central. If it does not, ductless usually avoids the biggest cost.
Step 2: size it with a load calculation
Do not let anyone size by square footage alone. EnergySage calls Manual J the most thorough, reliable method for determining a home's heating and cooling load, developed by the ACCA, and warns that simple per-square-foot sizing rules are basically worthless and more often wrong than right. As a screening figure only, EnergySage notes most homes need between 2 and 5 tons, roughly 1 ton per 600 square feet. Use that to gut-check a quote, then insist on the real calculation.
Step 3: read the efficiency ratings
Two numbers define efficiency: SEER2 for cooling and HSPF2 for heating. Carrier notes the federal minimum is 14.3 SEER2 and 7.5 HSPF2, and that models rated 17 SEER2 and above are considered high efficiency, with some reaching up to 22 SEER2. A simple guardrail is ENERGY STAR, which requires at least 7.8 HSPF2, 15.2 SEER2, and 11.0 EER2 for standard split systems. Choosing an ENERGY STAR model keeps you off the least efficient equipment without decoding every spec.
Step 4: match the cold-climate rating to your winters
If you get hard freezes, the cold-weather rating matters more than a high SEER2. ENERGY STAR's Cold Climate designation requires a COP at 5F of at least 1.75 and heating capacity at 5F of at least 70% of capacity at 47F. EnergySage adds that traditional heat pumps typically start losing efficiency at or below 35F, while cold-climate models maintain 100% efficiency as low as 5F. In a cold region, look for the Cold Climate label; in a mild one, a standard ENERGY STAR model is usually enough.
Step 5: set a realistic budget
Finally, anchor your budget to real ranges. EnergySage puts a central, ducted heat pump around $14,500, or $3,790 per ton, and a whole-home ductless system around $26,000, or $9,163 per ton, before incentives. This Old House cites a broader $8,000 to $15,000 for central heat pumps in most homes. One caution on incentives: the 30% federal heat-pump tax credit applied to installs through the end of 2025 and has since expired, so do not count on it as a current discount. Confirm any active state or utility rebate before you sign.
Frequently asked questions
How do I decide between ducted and ductless?
ENERGY STAR notes ductless is designed for homes without ductwork and for additions where extending ducts is hard, while ducted suits homes with good existing ductwork.
How should the heat pump be sized?
With a Manual J load calculation. EnergySage calls it the most reliable method and says per-square-foot rules are more often wrong than right. Most homes need 2 to 5 tons.
What efficiency should I look for?
The federal minimum is 14.3 SEER2 and 7.5 HSPF2. Carrier considers 17 SEER2 and above high efficiency. ENERGY STAR standard models require at least 15.2 SEER2 and 7.8 HSPF2.
Do I need a cold-climate model?
In regions with hard freezes, yes. ENERGY STAR Cold Climate models hold at least 70% capacity at 5F, while traditional units start losing efficiency at or below 35F.
Is there still a federal tax credit?
No. The 30% heat-pump credit applied to installs through the end of 2025 and has expired. Check for current state or utility rebates instead.