“Zach and Tony were great — they came to fix my water heater within an hour and got it running. They also let me know how old it is and that I might need to replace it next time something goes wrong. Excellent service! Thank you Zach and Tony!”
Sonoma & Marin HVAC
Efficient Comfort starts here.
Clean, efficient heating and cooling for the North Bay. Expert heat pumps, AC, furnaces, mini splits, and more.
About Green Core
A better HVAC experience — start to finish.
We were founded to change the way HVAC feels for homeowners. Clear communication, thoughtful design, and high-quality workmanship on every project.
- Energy-efficient heating, cooling & water heating
- Design-first approach — sized right for your home
- Vetted and trained technicians who respect your home
Why we're different
HVAC done the way it should be done.
The details other contractors skip are the details that make your system quieter, more efficient, and longer-lasting.
Design-first approach
We don't swap boxes. Every project starts with a proper load calculation, duct assessment, and design.
Electrification experts
Heat pumps, Harvest Thermal, and whole-home electric retrofits — it's what we do.
Rebates handled for you
We know the BayREN, TECH, and utility programs and handle the paperwork so you don't have to.
Clean, respectful installs
Shoe covers, drop cloths, and daily cleanup. Your home deserves it.
Straightforward pricing
No surprise. Clear options, clear pricing, clear timelines.
Long-term relationships
Most of our business comes from referrals. We're in this for the long haul.
Award winner
Voted Best of the North Bay.
We’re honored to have been recognized as a “Best of the North Bay” winner — an award that means a great deal to our entire team. What makes this recognition especially meaningful is that it comes from the community we serve every day. Being voted for by our customers is something we don’t take lightly, and we’re truly grateful for the trust and support we’ve received.
At Green Core Heating & Air, we set out to create a better experience from start to finish, and this award is a reflection of that commitment. It represents the relationships we’ve built, the homes we’ve worked in, and the homeowners who continue to choose us and recommend us to others.
We’re thankful to be part of such a strong and supportive community, and we’re committed to continuing to deliver the same level of care, craftsmanship, and service that earned us this recognition in the first place.
Customer reviews
Trusted by neighbors across the North Bay.
“Great service! Rich was on time, polite and professional. Did good work in reasonable time and left our place as clean as he found it. The house is nice and warm again!”
“Wow what a great experience! Rich was very professional. He was on time, wore shoe covers and treated me very well. I don't know much about heating and air but he explained everything very well. I'm nice and warm now and can't thank this company enough!”
“Can't say enough good things about Rich. His expertise was impeccable and his knowledge of our equipment was astounding. He kept my mind at ease by keeping me informed the entire service call. Now I have heat and couldn't be happier — thank you Rich!”
“Such a pleasant experience from the initial phone call to the finished product. Zach took my call and was able to get his technician out the next day. Rich was very knowledgeable and got my system repaired the same day. Thank you Greencore!”
“I don't give reviews like this lightly, but this company truly deserves it. I've worked with them for nearly 9 years, and the consistency, integrity, and quality they deliver is unmatched. They are incredibly knowledgeable, honest to the core, and always go the extra mile.”
Service area
Proudly serving Sonoma & Marin.
Based in Petaluma and serving homeowners across the North Bay. Click any pin on the map to see details.
Serving Petaluma, Santa Rosa, Rohnert Park, Cotati, Sebastopol, Windsor, Healdsburg, Novato, San Rafael, Mill Valley, Fairfax, and surrounding areas.
Ready for comfort that just works?
Tell us a little about your home and we'll get back quickly with clear options — no hard sell.