Installation and replacement. The company you're matched with sizes a new
system from a load calculation on the house, not the tonnage on the old nameplate, and quotes it
in writing before anything is ordered. Rancho Vistoso is in the Town of Oro Valley, so its permit rules apply rather than the City of Tucson's; the contractor confirms them and pulls the permit. A first replacement of builder equipment should be sized from a fresh load calculation rather than copied from the original nameplate. If TEP is your utility, ask whether the company you're matched with is a participating contractor in TEP's Efficient Home Program, which pays instant rebates as listed by TEP in October 2026. If your HOA reviews exterior equipment, its architectural committee may need to approve a change to the outdoor unit first.
Heating. At about 2,950 feet, Rancho Vistoso is valley-floor desert where Pima County's code winter design temperature is 35F, so heating duty is light. A heat pump is the sensible default here: the area needs about 2.6 cooling degree days for every heating degree day, so the same unit does the cooling you need anyway.
Maintenance. A tune-up before the first 100F day covers the coils, refrigerant
charge, electrical connections, capacitor and condensate drain, and a second look after the
monsoon clears the dust. Newer systems mostly need clean coils, the right refrigerant charge and clear condensate drains to reach their second decade in good shape.
Check any contractor's license with the Arizona Registrar of Contractors at roc.az.gov. Residential air conditioning and heating work falls
under the R-39 class. The service pages below go straight to the job you need.