Once you've determined that a heat pump makes sense for your home, here's how to find the best system for you in today's ever-growing market.
✔️ Size: As with traditional HVAC equipment, it’s important to size the system properly to ensure the best performance and efficiency. Heat pump size (a.k.a. “capacity”) is measured in tons, with 1 ton being equal to 12,000 British thermal units per hour (Btu/hr.). Smaller heat pumps start at 2 tons and the biggest top out at 5 tons. Your home’s square footage is a key factor here, but things like insulation and air sealing also play a role, so it’s important to have a load calculation done by a certified professional to determine what size heat pump is right for you.
✔️ Efficiency: Though all heat pumps are energy efficient, some are more so than others. In cooling mode, the spec to look for is SEER2 (short for Seasonal Energy-Efficiency Rating), while heating efficiency is measured by HSPF2 (short for Heating Seasonal Performance Factor). In both cases, the higher the number, the more efficient the heat pump. SEER2 ratings for heat pumps range from 13 to 25, while HSPF2 ratings range from 7 to 13. Highest efficiency units cost more, but you'll make up the difference over time through lower utility bills.
✔️ Compressor design: The compressor is the engine of the heat pump. Basic models are single speed, meaning the compressor is either on or off (think of a refrigerator, with its compressor cycling on and off throughout the day). The latest technology is variable-speed, in which the compressor runs constantly, making tiny adjustments to maintain precise temperature levels. Besides delivering optimal comfort and efficiency, variable speed compressors are extremely quiet, since they’re not constantly powering on and off.
✔️ Temperature performance: While the latest heat pump technology can withstand extreme climate conditions, not all models have the necessary upgrades, which include refrigerants with a lower boiling point and advanced compressors. Standard models without these features still struggle when outside temperatures dip below 25° F. If you live in a region with harsh winters, look for a heat pump that’s Energy Star-certified with an added cold-climate certification. Manufacturers might also include temperature-related language in their specs, for example, “100% heating capacity at –5°F and 70% to 81% heating capacity at –13°F.” Cold-climate heat pumps (CCHPs) cost more, but they will pay for themselves over time in the form of even lower energy bills.
✔️ Connectivity: Because heat pumps are an innovative category, many systems feature Wi-Fi-connectivity with advanced programming and features through a companion app. This allows you to monitor and operate the system remotely, for example, turning off the heat or AC if you forgot to do so before an extended vacation. In some cases, you can also give your service technician access to the app so that they can monitor the maintenance schedule and be on the lookout for any unusual activity, say, sudden temperature fluctuations.