Your Tucson Mountains Heating and Cooling Experts
The federal minimum efficiency standards for new AC equipment changed in 2023, and they vary by region. Arizona falls in the southern efficiency region, meaning new AC installations in Pima County must meet the 15 SEER2 minimum — not the 14 SEER2 that applies in northern states. Higher-efficiency equipment costs more upfront but reduces operating costs over the system's life. In Tucson Mountains's climate with its extended cooling season, the payback on higher SEER2 equipment comes faster than it would in a market with a shorter AC season.
In Tucson Mountains, AC is a life-safety system during peak summer. Pima County temperatures regularly push equipment to its design limits — making pre-season refrigerant checks, capacitor testing, and coil cleaning the difference between a system that lasts 14 years and one that fails at year 9.
With an estimated 3,780 annual cooling degree days and roughly 104 days exceeding 90°F, Tucson Mountains's climate places above-average demand on residential AC systems. Pima County's population of 11,353 includes many homes with equipment installed during the region's growth years — systems now in the replacement planning window.