The Best HVAC Companies in Fremont (2026 Edition)
3 vetted contractors, thoroughly researched and ranked
Last Updated: February 2, 2026
Our Top Pick
Hassler Heating and Air Conditioning
License #770180 · Verified via CSLB
Diamond Certified for 12 consecutive years with a dual specialty as both a full-service HVAC contractor and home performance company—has helped customers secure over $5 million in energy rebates.
Platform Scores
(393)
(693)
A+
12 yrs
82%
NATE Certified
Factory Authorized Carrier Dealer
Nest Pro Dealer
Carrier Authorized
24/7 Emergency
25+ years in business, specializing in heat pump conversions and home electrification for Bay Area homes with complex HVAC needs. Diamond Certified for 12 consecutive years with exceptional rebate expertise—has helped customers secure over $5 million in energy rebates since 2010. Best for homeowners seeking premium, full-service HVAC work with expert guidance on energy upgrades and incentive programs.
Essential Q&A
What makes them stand out?
Diamond Certified for 12 consecutive years with a dual specialty as both a full-service HVAC contractor and home performance company—has helped customers secure over $5 million in energy rebates.
Who should hire them?
Bay Area homeowners with older or architecturally complex homes seeking premium, comprehensive HVAC service with expert guidance on electrification and available rebates.
Insider tip
Ask about their VIP Club Membership for 15% off repairs and schedule during non-peak seasons for faster appointment availability.
Platform Scores
(1,207)
(561)
A+
9 yrs
77%
Diamond Certified
Elite Pearl Certified
Angi/HomeAdvisor Screened & Approved
Lennox Premier Dealer Authorized
Daikin Comfort Pro Authorized
24/7 Emergency
Family-owned HVAC company founded in 2015 with 10 years in business, specializing in residential heating, cooling, and electrical services across Alameda and Contra Costa Counties. Reviews consistently praise their knowledgeable technicians who explain work thoroughly, arrive on time, and clean up meticulously. Best for homeowners seeking a community-focused contractor with strong manufacturer relationships and responsive emergency service.
Essential Q&A
What makes them stand out?
Family-owned operation with owner Chris Donzelli personally involved, 9 consecutive years Diamond Certified with 341 verified customer surveys, and multiple SFGATE Best of Bay Area awards for both HVAC and electrical services.
Who should hire them?
Homeowners in Alameda or Contra Costa County seeking a responsive, community-minded contractor with strong manufacturer relationships and comprehensive service plans.
Insider tip
Ask about their maintenance program that includes real-time updates and technician reminders—satisfied customers consistently mention the thorough bi-annual inspections as key to avoiding breakdowns.
Platform Scores
(716)
(434)
A+
10 yrs
Factory-Trained Technicians
Bryant Authorized
24/7 Emergency
In business since 2008, AIS Heating & Air Conditioning is a family-owned HVAC contractor specializing in residential and commercial heating, cooling, and indoor air quality services. Reviews consistently praise their knowledgeable technicians who explain work clearly, hands-on owner involvement, and professional service. Best for Bay Area homeowners seeking a reliable, established contractor with verified quality credentials and performance guarantees.
Essential Q&A
What makes them stand out?
Diamond Certified for 10 consecutive years with a hands-on owner who personally oversees quality control on every job, distinguishing them from larger corporate HVAC operations.
Who should hire them?
Bay Area homeowners who value transparent communication, quality workmanship backed by performance guarantees, and prefer working with a family-owned business rather than a large franchise.
Insider tip
Request Art Miner for consultations—he's repeatedly praised for thorough explanations and no-pressure recommendations—and ask about their Comfort Protection Plan for ongoing maintenance discounts.