Fix what loses cooling first (the roof, ducts and air leaks), then size the equipment to the improved house. Climate Pros Tucson can match you with a licensed pro who looks at the whole picture before recommending a bigger unit.
Why does the order matter?
Tucson’s airport averages about 3,424 cooling degree days a year and about 68 days at or above 100F, so cooling is the main load. If heat pours in through the roof and cooled air leaks from ducts, a new unit just works harder at the same problem. Fix the leaks and the new equipment can be sized for a smaller load.
What is the right order?
1. Get a baseline
Ask the pro for a load calculation and a duct test. The City of Tucson requires load and sizing calculations for new and replacement HVAC equipment, so the number is needed anyway.
2. Seal and repair ducts
ENERGY STAR says a typical forced-air house can lose about 20% to 30% of its air to duct leaks, holes and poor connections. That is a national figure, so ask for a measured test on your home. As listed by TEP in October 2026, the Efficient Home program offers duct sealing up to $300, varying by leakage reduced, through participating contractors.
3. Roof, attic and air leaks
Roof insulation and shading reduce heat gain. Seal gaps around windows, doors and penetrations. A pro or energy auditor can point out what matters most in your home.
4. Windows and shade
Shade west-facing glass with awnings, screens or window film. In Tucson the hottest stretch of the day lines up with TEP’s summer on-peak window, so blocking afternoon sun on the west side does double duty.
5. Then the equipment
A heat pump is the sensible default for a Tucson basin home. As listed by TEP in October 2026, up to $720 applies to a heat pump quality installation and up to $600 to an AC quality installation, when you retire an older working unit or a non-working AC. TEP listed up to $100 per ton for a mini split heat pump or AC. Confirm with TEP at 866-473-8761.
Federal credits 25C and 25D ended for installs after 2025. Arizona’s HEAR rebates (Efficiency Arizona) are live but narrowed: since September 1, 2026 they no longer pay to replace gas equipment with electric, and insulation or air-sealing standards may be required alongside a heat pump rebate. That’s one more reason to do the envelope first.
Where does a smart thermostat fit?
It’s a small upgrade that can help you manage a Time-of-Use plan. TEP’s summer on-peak window is 3 to 7 p.m., Monday to Friday, May through September. See smart thermostat with a heat pump.
What should you ask a pro?
- What is the leakage test result?
- What size does the load calculation support?
- What happens to the load after sealing?
- Which rebates apply to this scope?
Related: duct leak repair, TEP heat pump rebates and energy efficient HVAC upgrades. See our AC installation service and the Tucson HVAC hub.
When to call us
Call (520) 353-2520 and we’ll match you with a licensed local pro.