Marin and Sonoma County Heating and Air Conditioning services offered by Ongaro & Sons are extremely comprehensive. We offer repair and installation services for anything that has to do with heating, ventilation, and air conditioning (HVAC). We are Trane Comfort Specialists and specialize in new high-efficiency HVAC systems and indoor air quality. We work on any make or model of HVAC equipment and our trucks are fully stocked with repair parts. Listed below are our HVAC services.