The Best HVAC Companies in Santa Rosa (2026 Edition)
2 vetted contractors, thoroughly researched and ranked
Last Updated: January 28, 2026
Our Top Pick
Ongaro & Sons
License #215233 · Verified via CSLB
Four generations of family ownership since 1932 with NATE-certified technicians, Diamond Certified status for 10 consecutive years, and a 100% satisfaction guarantee backed by 93 years of community reputation.
Platform Scores
(2,497)
(480)
A+
10 yrs
76%
NATE Certified
PHCC Certified
Trane Authorized
Mitsubishi Authorized
Family-owned since 1932, Ongaro & Sons is a fourth-generation HVAC, plumbing, and electrical contractor celebrating 93 years of service. Reviews consistently praise their professional, well-trained NATE-certified technicians who do work properly and maintain clean job sites. Best for homeowners in Sonoma and Marin Counties seeking an established contractor with multi-generational expertise, though pricing transparency scores below industry average.
Essential Q&A
What makes them stand out?
Four generations of family ownership since 1932 with NATE-certified technicians, Diamond Certified status for 10 consecutive years, and a 100% satisfaction guarantee backed by 93 years of community reputation.
Who should hire them?
Homeowners in Marin, Sonoma, and Napa Counties who prioritize quality workmanship and expertise over lowest price, and value a well-established company with multi-generational customer relationships.
Insider tip
Sign up for their yearly maintenance plan—reviews consistently mention they proactively contact customers for scheduled maintenance. Be aware their $98 minimum service call covers diagnosis only, and request detailed cost breakdowns upfront since only 68% of Checkbook respondents rated them superior for early cost disclosure.
Platform Scores
(1,702)
(627)
A+
13 yrs
71%
Diamond Certified
NATE Certified
EPA 608 Certified
Lennox Authorized
Mitsubishi Electric Diamond Contractor Authorized
24/7 Emergency
16 years in business specializing in energy-efficient HVAC installation and plumbing services across Sonoma, Marin, and Napa Counties. Diamond Certified for 13 consecutive years with 425 verified customer surveys and a strong satisfaction guarantee. Best for homeowners seeking a well-established, full-service HVAC contractor with comprehensive warranties and membership programs who prioritize professionalism over lowest price.
Essential Q&A
What makes them stand out?
Diamond Certified for 13 consecutive years with a 100% Right or 100% Free satisfaction guarantee, backed by 425 verified telephone surveys and over 150 hours of annual technician training.
Who should hire them?
Homeowners in Sonoma, Marin, or Napa Counties seeking a well-established, full-service HVAC and plumbing contractor with strong warranties who value professionalism and comprehensive service over lowest price.
Insider tip
Join the Moore Rewards membership program ($19.95/month) for two included annual tune-ups plus a plumbing inspection—reviews consistently praise the value and priority scheduling this provides.