Diamond AC and Heating is a Phoenix-based HVAC contractor operating 24 hours a day, seven days a week, with a 4.3-star rating from 590 Google reviews. Located at 20801 N 19th Ave #1 in Phoenix, the company provides both residential and commercial HVAC services across the greater Phoenix area.

The service list is among the most comprehensive in the Phoenix market: AC installation, repair, maintenance, replacement, and tune-up; heating installation, repair, maintenance, replacement, and tune-up; mini-split and ductless HVAC systems; heat pump services; ductwork and duct cleaning; indoor air quality and humidification; swamp cooler service; water heaters; ventilation work; and smart thermostats. Residential and commercial customers are both served. Financing is available.

Named technicians in positive reviews include Caleb, Ryan, Travis, Michael, and Daniel. Ryan is mentioned specifically for explaining multiple service options in detail without pressure to replace a 15-year-old unit that was still functional, and for arriving on time within the quoted window. Travis and Michael completed a full ductwork cleaning with equipment that left the house cleaner than before they arrived — the customer noted an SRP rebate was available after the duct cleaning, a meaningful bonus for utility customers in that district.

Review data does include a notable complaint: a 2025 one-star review describes a $200 repair that the customer later learned was never performed when another company found the same issue unrepaired, ultimately requiring $500 in additional work. This is the most substantive negative review in the sample. A separate one-star review appears to be for a vehicle, not HVAC service.

For Phoenix homeowners with comprehensive service needs or commercial properties, Diamond AC and Heating covers the full HVAC lifecycle. Call (602) 753-5375 or visit diamondacandheating.com.