The short answer
A heat pump cools exactly like a traditional AC but also heats efficiently, so it replaces both your AC and furnace with one system. In Phoenix's mild winters and with up to $8,000 in federal heat-pump incentives, it's often the smarter long-term choice — but the right answer depends on your home and existing heat.
What's the actual difference?
A traditional setup pairs an air conditioner (cooling only) with a separate furnace (usually gas) for heat. A heat pump is one system that cools in summer exactly like an AC, then reverses to move heat indoors in winter — no separate furnace needed.
For cooling, a modern heat pump and a modern AC are essentially the same in Phoenix summers. The difference is entirely about heating and what equipment you keep.
Why do Phoenix winters favor a heat pump?
Heat pumps are most efficient in mild climates — and Phoenix winters are mild. The temperatures where heat pumps lose efficiency are far colder than a typical Valley winter, so a heat pump heats efficiently here for the relatively few hours you need it.
Because the heating season is short, you're not giving up much, and you gain a single, simpler all-electric system.
How do incentives change the math?
The financial picture currently tilts toward heat pumps:
- Federal HEAR / Efficiency Arizona: up to $8,000 toward a qualifying heat pump for income-qualified households (through September 30, 2031)
- Federal HEAR / Efficiency Arizona rebate: up to $8,000 toward a qualifying heat pump for income-qualified households (the federal 25C tax credit ended December 31, 2025)
- SRP Cool Cash applies to qualifying high-efficiency systems for SRP customers
- One system to buy and maintain instead of two
The incentives lean heat pump
The largest federal dollars target heat pumps. For many Phoenix homeowners — especially those who qualify for HEAR — that swings the lifetime cost in the heat pump's favor.
When does a traditional AC + furnace still win?
There's no universal winner — the right call depends on your existing equipment, whether you qualify for incentives, and your comfort preferences. The honest move is to price both for your specific home.
A traditional system can be the better pick when:
- You have a relatively new, healthy gas furnace worth keeping — replace only the AC
- Natural gas is inexpensive in your situation and you prefer gas heat
- Up-front budget is the deciding factor and incentives don't apply to you
Yes. Phoenix winters are mild and stay well within the range where modern heat pumps heat efficiently. For the relatively few cold hours we get, a properly sized heat pump handles home heating comfortably.
Yes — in cooling mode a heat pump works the same way as an air conditioner and delivers the same comfort. There's no cooling penalty for choosing a heat pump in Phoenix.
Terms in this guide
- Heat pump
- An all-electric system that both cools and heats by moving heat rather than burning fuel. A heat pump cools exactly like an AC in summer and reverses to provide efficient heat in Phoenix's mild winters — one system instead of a separate AC and furnace.
- HSPF2
- Heating Seasonal Performance Factor 2 — the heating-efficiency rating for a heat pump. It matters less in mild Phoenix winters than SEER2/EER2 cooling efficiency, but it's worth knowing if you're choosing a heat pump for year-round comfort.
- SEER2
- Seasonal Energy Efficiency Ratio 2 — the current rating for how efficiently a central AC or heat pump cools over a season. Higher is more efficient. As of 2023 the federal minimum for new split-system ACs in the hot-dry Southwest (including Arizona) is 14.3 SEER2; SRP's Cool Cash rebate requires 15.2 SEER2 or higher.
- HEAR / Efficiency Arizona
- The federal Home Electrification and Appliance Rebates program, administered in Arizona as 'Efficiency Arizona.' It offers income-qualified households up to $8,000 toward a qualifying heat pump, with funding available through September 30, 2031.
- 25C tax credit
- The federal Energy Efficient Home Improvement Credit — ENDED for equipment placed in service after December 31, 2025 (July 2025 federal tax law). Systems installed by that date could claim 30% of cost, up to $600 for a high-efficiency central AC or $2,000 for a heat pump, on the 2025 return. Confirm details with your tax professional.
- Furnace / air handler
- The indoor unit that moves conditioned air through your ducts. A gas furnace burns fuel for heat; an air handler paired with a heat pump moves air for both heating and cooling. Its blower is what pushes cold air through the house.