Ongaro & Sons

Ongaro & Sons has earned its standing as San Anselmo's most-reviewed HVAC contractor, amassing 764 reviews that collectively average 4.8 stars. The company operates around the clock, every day of the week, ensuring residents across Marin County never face a heating or cooling emergency without rapid support. This 24/7 availability, combined with a reputation for sending knowledgeable technicians who explain their work thoroughly, has made the business a go-to resource for homeowners from Fairfax to Ross and beyond.

What distinguishes Ongaro & Sons from typical HVAC companies is their multi-trade capability. The business handles not only heating and cooling systems but also electrical work and plumbing, meaning a single phone call resolves multiple home system issues. Reviewers consistently note that technicians arrive on time, communicate clearly about what they find, and provide practical maintenance guidance, such as filter replacement schedules, rather than simply completing a transaction.

The named technicians appearing across reviews reveal a team that goes beyond standard service calls. Brandon H, an HVAC service technician, conducted an annual maintenance appointment with photographic documentation of every step, explaining each repair and offering tips the homeowner had not previously known. Roger Hunter, an electrician, earned a holiday-weekend emergency call the day before Christmas and pulled off what one reviewer called a miracle. Dominic and Ethan removed decrepit ductwork and installed new systems, solving uneven heat flow throughout an entire house. When L Witter discovered toilet and shower backups hours after moving in, Nico arrived the same day to restore function before scheduling follow-up camera diagnostics.