Diamond Air Services

Diamond Air Services is a locally owned and family-operated HVAC contractor based in Ontario, California, serving the broader Inland Empire including Irvine and Arcadia. The company holds California contractor licenses C-20, C-43, and General B (#1047483), and maintains a perfect 5.0-star rating across 419 reviews, a volume that signals sustained quality rather than a handful of fortunate jobs. With more than two decades of hands-on experience in the air conditioning and heating trade, the team handles both residential and light commercial work, covering new installations, diagnostics, repairs, and ongoing maintenance. Business hours run Monday through Friday from 7 AM to 6 PM, with Saturday service from 8 AM to 3 PM.

What distinguishes Diamond Air Services goes beyond standard service calls. The company emphasizes transparent customer education, walking homeowners through every diagnostic finding before recommending a repair path or replacement. Their onboarding process is built around letting property owners make the most informed decision possible about their HVAC investment. For customers who need flexibility, financing options are available to spread costs over time rather than deferring critical comfort upgrades.

Reviewers repeatedly highlight technician Howie by name for exceptional outcomes. One homeowner called after a sudden heater failure and received a same-business-day visit; Diamond Air diagnosed a faulty gas valve, sourced the part, and completed the repair the same afternoon without charging anything. Another customer described a full HVAC replacement handled smoothly from initial consultation through city inspection, noting Howie's crew left the home spotless and provided helpful post-install guidance. These scenarios illustrate how the company balances speed, honesty, and thoroughness across heating and cooling emergencies alike.