Services Rest assured that any service completed by our technicians will be done with the utmost care and expertise. At Whole House Fans Orange County, we hire highly qualified technicians and encourage all our technicians to become NATE certified. Energy Services Diagnostics Duct Testing & Sealing HVAC System Balance Energy Monitoring Systems Energy Audit Sizing fans & Installation Repair Maintenance Install Contract Service Efficiency experts in testing duct sizing and installation utility rebates and incentives energy savings ideas partnering with other contractors