Quick verdict
Heat pumps have hit a tipping point in the U.S. — over 5 million units were sold in 2024, outselling gas furnaces for the first time 1. If you're replacing an old system or building new, a heat pump is now the mainstream choice for efficient, year-round comfort.
Side-by-side comparison
When you're comparing top heat pump models, the efficiency numbers tell you a lot about long-term savings. For split systems, the bar for ENERGY STAR Most Efficient 2025 is SEER2 ≥ 15.2, EER2 ≥ 11.0, and HSPF2 ≥ 7.8 2. Single-package units have a slightly lower EER2 threshold of 10.0 and HSPF2 of 7.2, but the SEER2 requirement stays at 15.2 2. Check these numbers against the models you're considering—hitting them means the unit is among the most efficient on the market.
Key differences explained
When you're comparing heat pumps, the efficiency ratings are where you'll see the biggest differences between models. Think of HSPF2 as the miles-per-gallon for heating—it stands for Heating Seasonal Performance Factor 2, and a higher number means better heating efficiency 3. For 2025, the Department of Energy has set minimum HSPF2 requirements, so any new model you buy will meet a baseline efficiency standard 3.
Beyond efficiency, you'll notice differences in noise levels, cold-climate performance, and smart features. Some units stay whisper-quiet even at full load. Others ramp up to a noticeable hum. If you live where winters dip below freezing, look for models with enhanced vapor injection—they keep pumping heat when standard units start to struggle. Smart connectivity varies too: some brands offer full app control and utility demand-response integration, while others keep it simple with basic thermostat compatibility.
When to choose Carrier
If you're looking for a heat pump that runs quietly and keeps your home comfortable year-round, Carrier is a top choice. Their models feature variable-speed technology, smart thermostats, and superior dehumidification 4. The system adjusts its output to match your home's exact needs instead of blasting on and off. You'll notice steadier temperatures and lower humidity, especially in summer.
Carrier's focus on high-efficiency design also helps keep energy bills in check. The variable-speed compressor ramps up or down gradually, so you avoid the noisy, full-blast starts that older units are known for. If you're sensitive to sound or your outdoor unit sits near a bedroom window, this quiet operation is a real benefit 4.
Pairing a Carrier heat pump with their smart thermostat gives you even more control. You can set schedules, monitor energy use, and get maintenance alerts from your phone. For homeowners who want a set-it-and-forget-it system that still delivers premium comfort, Carrier's technology makes a strong case.
When to choose Y
If you're looking at a multi-zone system that can handle both heating and cooling across several rooms, a VRF multi-split heat pump might be the right call. These systems use one outdoor unit connected to multiple indoor heads, so you can set different temperatures in different zones. They're especially useful in homes where ductwork isn't practical or where you want to avoid the energy losses that come with ducts.
For cold climates, you'll want a unit that's been tested and listed under NEEP's ccASHP Specification Version 4.0, which covers cold-climate air source heat pumps including VRF multi-split categories 5. That spec took effect January 1, 2023, so models meeting it are designed to perform even when temperatures drop well below freezing. Checking the NEEP product list is a quick way to confirm a VRF system will actually deliver in your climate.
Cost considerations
Heat pump prices vary widely, but you'll find models from budget-friendly to premium tiers. A good installer won't just quote a number—they'll walk you through tax credits, rebates, and financing options that can knock thousands off the final bill 6. Many homeowners don't realize these incentives exist until a pro points them out, so ask upfront.
Frequently Asked Questions
How do I know what size heat pump I need?
Getting the size right is one of the most important decisions you'll make. A unit that's too small won't keep up on the coldest days, and one that's too large will cycle on and off too often, wasting energy and wearing out parts. Correctly sizing a heat pump maximizes comfort and cost savings; rules of thumb are often inaccurate 7. Online calculators might give you a ballpark, but experienced plumbers warn they're almost always wildly inaccurate 7. The only reliable way is a Manual J load calculation done by a pro who measures your home's insulation, windows, and air leakage.
Should I use emergency heat when it's really cold?
You can, but you probably don't want to. Emergency heat mode forces your system to use electric resistance heat strips instead of the heat pump, and that's much more expensive to run 7. Modern cold-climate heat pumps are designed to work efficiently well below freezing, so you shouldn't need to switch over unless the heat pump itself fails. If your system keeps kicking into emergency heat on its own, have a technician check the settings and the outdoor unit.
What makes a heat pump installation good versus just okay?
Even the best-rated model won't perform well if it's installed poorly. Proper installation of ASHP systems ensures customer satisfaction and efficient operation in cold climates 8. That means things like correct refrigerant charge, sealed ductwork, proper airflow, and a level outdoor unit on a raised pad. When you're getting quotes, ask contractors how they handle these details—it makes a bigger difference than the brand name on the box.