Heat pump vs AC and a gas furnace in Tucson: which one fits?
For a home in the Tucson basin, a heat pump is the sensible default. Tucson needs about 2.6 cooling degree days for every heating degree day (1991-2020 normals at Tucson International Airport), so you're buying an air conditioner either way, and a heat pump is an air conditioner that also runs in reverse for the mild winter. AC plus a gas furnace still makes sense in a few cases, and Mount Lemmon is its own climate. Climate Pros Tucson matches you with a licensed local pro who can quote both.
Why does Tucson's climate favor a heat pump?
Because the heating job is small and the cooling job is huge. The airport averages 3,424 cooling degree days a year against 1,333 heating degree days. It sees about 68 days a year at or above 100F, and a record 112 such days in 2024. On the heating side, it averages fewer than 12 nights a year at or below 32F, and no normal day stays below freezing.
The City of Tucson sits in energy code climate zone 2B and designs heating for a 35F outdoor temperature (summer design is 105F). A heat pump sized for the summer load usually has heating capacity to spare at 35F. That's the opposite of a cold-climate city, where the heating load drives the decision.
Side by side for a Tucson home
| Question | Heat pump (split or package) | AC plus gas furnace (split or gas pack) |
|---|---|---|
| Cooling | Same job as an AC of the same rating | Same job as a heat pump of the same rating |
| Heating at the 35F design temperature | Handles it when sized by the load calculation; backup strips cover defrost and cold snaps | Full gas heat at any outdoor temperature |
| Fuel | Electric only (TEP or Trico) | Electric for cooling plus Southwest Gas for heat |
| TEP Efficient Home rebate (Oct 2026) | Up to $720 for a heat pump quality installation | Up to $600 for an AC quality installation; no furnace rebate listed |
| Federal 25C credit | Ended for installs after 2025 | Ended for installs after 2025 |
| ENERGY STAR level | SEER2 15.2 and HSPF2 7.8 for certified air-source heat pumps | Ask for the AC's SEER2 and the furnace's AFUE on the quote |
| Combustion safety | No flame, no flue | Burner, flue and carbon monoxide checks belong in every service visit |
| Permit in the City of Tucson | Required, new or replacement | Required for both the AC and the furnace |
Heat pump, the case for it
- One machine covers the long cooling season and the short heating season
- No gas burner to inspect and no flue to keep clear
- The larger TEP rebate of the two, as listed in October 2026
- Available as a split system or a rooftop package unit, so it fits most existing layouts
Heat pump, the catches
- Backup heat strips draw a lot of power, and TEP's winter peak is 6 to 9 a.m. and 6 to 9 p.m. on weekdays
- The outdoor unit defrosts on the coldest mornings, which can look like steam and sound odd
- An older electrical panel may need a load check before adding strips
AC plus gas furnace, the case for it
- Gas heat holds output on any winter night
- If the furnace is in good shape, replacing only the AC is a smaller job
- Makes sense at higher elevation, where heating load is real
AC plus gas furnace, the catches
- Two systems to maintain for a heating season this short
- Southwest Gas's 2026 Arizona residential rebates list no furnace rebate
- Carbon monoxide risk means burner and venting checks every year
When is a heat pump the right call?
- Any home on the Tucson basin floor where the AC is due for replacement anyway
- You want one system to maintain instead of two
- You're replacing a heat pump or electric equipment and want to ask about Arizona HEAR rebates (Efficiency Arizona, income-qualified)
- You're a TEP customer and the contractor participates in the Efficient Home Program
When does AC plus a gas furnace still make sense?
- The furnace is sound and only the AC failed, so you replace one piece
- The home is on Mount Lemmon or in Summerhaven, where Pima County uses a 4F winter design temperature above 4,000 feet and the weather station averages about 53 freezing nights a year
- The electrical panel can't take a heat pump with backup strips and an upgrade isn't in the plan
- You want a dual-fuel setup: a heat pump for most hours with gas as backup
What should the quote show?
Ask for both options from the same licensed pro, each in writing, with the equipment model, its SEER2 (and HSPF2 for a heat pump), whether it's a split system or a package unit, the load calculation the City of Tucson requires, and whether the contractor participates in TEP's Efficient Home Program. The contractor pulls the permit. Check the contractor's license with the Arizona Registrar of Contractors at roc.az.gov; residential heating and cooling falls under the R-39 class or its R-39R subclasses.
FAQ
Will a heat pump keep my Tucson house warm on a freezing night?
In the Tucson basin, yes for most homes, when the pro sizes it to the code design conditions. The City of Tucson designs heating for a 35F outdoor temperature, and Tucson International Airport averages fewer than 12 nights a year at or below 32F (1991-2020 normals). On the coldest mornings the outdoor unit runs short defrost cycles and backup heat strips can help. Mount Lemmon and Summerhaven are different: Pima County uses a 4F winter design temperature above 4,000 feet, so backup heat or a cold-climate model is a question for the pro there.
What are backup heat strips and when do they run?
They're electric resistance heaters in the indoor air handler. They help when the heat pump can't hold the setpoint on its own, and they run during defrost on some systems. They use more electricity than the heat pump itself, so it matters when they run. TEP's winter on-peak hours are 6 to 9 a.m. and 6 to 9 p.m. on weekdays from October to April, which is exactly when a cold house wants heat. Ask the pro how the thermostat is set up to limit strip use.
Is there a rebate for a heat pump in Tucson in 2026?
TEP's Efficient Home Program is active. As listed by TEP in October 2026, it offered up to $720 for a heat pump quality installation and up to $600 for an AC quality installation, taken off the price by a participating Efficient Home contractor. Amounts change, so confirm with TEP or the contractor at quote time. The federal 25C credit ended for equipment placed in service after December 31, 2025, and Arizona has no state tax credit for HVAC equipment. Southwest Gas's 2026 Arizona residential rebate application lists no furnace rebate.
I'm on Trico, not TEP. Does any of this change?
The climate math doesn't change, but the TEP rebate does not apply to a Trico account. Trico Electric Cooperative serves northwest Tucson and Marana south to Green Valley and Sahuarita. Ask Trico directly what it offers before you count on any incentive.
Can I keep gas for the stove and water heater and still go heat pump for HVAC?
Yes. Switching the heating and cooling to a heat pump doesn't require removing other gas appliances. One change to know about: under DOE guidance effective September 1, 2026, Arizona's HEAR rebates (Efficiency Arizona) no longer pay to replace gas appliances with electric ones. HEAR heat pump rebates now apply to replacing existing electric equipment or heat pumps.
What size heat pump do I need?
In the Tucson basin the cooling load sets the size, because the home needs far more cooling than heating. The City of Tucson requires load and sizing calculations for new and replacement HVAC equipment, so the licensed contractor runs those before quoting. Our BTU estimator gives you a starting number to compare against the quote.
Not sure which setup fits your house?
Call (520) 353-2520 with your address, what you have now (split or rooftop package, gas or electric heat), and whether your account is with TEP or Trico. Climate Pros Tucson matches you with a licensed local pro who can quote a heat pump and an AC plus furnace side by side.
Call (520) 353-2520