Fast Repairs.
Expert Installs.
Done Right.
AC repair, furnace install, full system replacement, and ongoing service — for North Bay homes, by a team that gets it right.
Ready for a better HVAC experience?
Free on-site assessment. Upfront quote. No pressure.
Or call us directly:
(707) 988-5858$150 Diagnostic, Waived When We Do the Repair.
You'll know exactly what's wrong and exactly what it costs before we touch a thing. Move forward with the repair and the diagnostic fee comes right off your invoice.
What the $150 covers
A trained GreenCore technician who shows up on time and gets under the hood.
We test the system, find the actual cause, and explain it in plain English so you can make the call.
You approve the repair and the price in writing first. No surprise line items when we're done.
Say no and you've still got a straight answer about your system for $150. Say yes and the $150 disappears.
Estimates on new system installations and replacements are always free The $150 diagnostic applies to repair service calls only.
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.
Repair. Install. Replace. Maintain.
Whatever your HVAC needs — we handle it all. Fast repairs, proper installs, full replacements, and ongoing service for North Bay homes.
Heat Pumps
Efficient whole-home heating and cooling in one system. Properly load-calculated and designed for your home's specific needs.
Air Conditioning
Central AC systems sized and designed for your home. No guessing, no oversizing — just reliable comfort all summer long.
Furnaces
High-efficiency gas furnaces installed and balanced for your home's layout. Warm, consistent heat — every room, every time.
Mini Splits
Ductless comfort for rooms, additions, and zones. Easy to install, efficient to run, and fully zoned for your lifestyle.
Duct Work
Leaky or undersized ducts kill efficiency. We design and build ductwork that delivers air exactly where it needs to go.
Harvest Thermal
Thermal storage water heating — maximum efficiency, minimal grid draw. We're certified installers for this cutting-edge system.
What Does a New System Cost?
Most contractors make you call before they'll tell you. Full system replacements in Sonoma and Marin typically run $16,000 to $20,000 installed. Here's what shapes that number and what your price includes.
What That Price Includes
- A load calculation and system design built around your home
- Equipment, installation labor, startup, and commissioning
- Permits and Title 24 documentation
- Rebate paperwork for BayREN, TECH Clean California, and utility programs, filed for you
- Haul-away of your old equipment and daily cleanup
What Moves Your Price
These are typical installed ranges for homes in Sonoma and Marin. Every home is different, and the only way to know your number is a free in-home estimate.
Make It Affordable.
Flexible financing and money-saving rebates — we help you get the most out of every dollar.
Flexible Financing
State & Local Rebates
Top 3 reasons customers choose GreenCore over competitors.
Fast, Reliable Service
We respond quickly and arrive on time to restore your home's comfort with dependable HVAC solutions.
Honest Pricing & Transparent Recommendations
No hidden fees or unnecessary upsells — just straightforward advice and fair pricing you can trust.
Skilled, Customer-Focused Technicians
Our experienced HVAC professionals deliver quality workmanship while treating your home with care and respect.
Trusted by neighbors across the North Bay.
"One of the best HVAC companies in Northern California. Easy to work with, quality work. A step above the rest!"
"I highly recommend Green Core Heating & Air. Rich spent all morning diagnosing and checking everything thoroughly. He took the time to explain everything clearly. Great experience all around and the price is unbeatable!"
"Zach Milano and his crew are outstanding. Thoughtful, positive, professional, and always smiling. The crew was reliable, respectful, and easy to work with from start to finish. I highly recommend them."
"Our A/C broke and Green Core HVAC truly saved us. It's rare to find someone who is both really good at what they do and also such a genuinely good human. I cannot recommend Green Core HVAC enough."
"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!"
"Tony and the team were great at installing our new Harvest heat pump system. The communication has been great and the entire team was very respectful and helpful."
Proudly Serving the North Bay
Heating & cooling for homes across Sonoma County.
Simple. Fast. Done Right.
Call or Request a Free Estimate
Call us or fill out the form — takes less than a minute.
Free On-Site Assessment
We schedule an appointment and assess your home's needs.
Same-Day Installation or Repair
We provide a transparent quote and get to work — done right.
Gallery of Recent Work
Real jobs, real results — before & after photos from North Bay homes.
Common Questions
Ready to Get Started?
Call us or book online — same-day service available.