AC and Furnace Replacement in Vacaville, CA

Free In-Home Estimate

  • With a design specialist
0% APR for 60 months*
Subject to credit approval.
*Important terms of financing

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When an older air conditioner or furnace costs more to keep running than it is worth, it is time to look at a replacement. We install air conditioners, gas furnaces and heat pumps in Vacaville homes, and every design specialist on our team started out as a technician. Call (707) 678-1784 or book online to set up a visit.

0% APR for 60 months*

Subject to credit approval.
*Important terms of financing

Our AC and furnace replacement work in Vacaville

  • Replacing heating and cooling systems in Vacaville homes since 1991.
  • Winner of the 2025 Dave Lennox Award, which recognized Greiner as one of the top 25 Lennox dealers in the country.
  • Odds are we put in the system next door.

See more reviews, handwritten and signed by real customers:
Read Their Handwritten Reviews

"As we're having another stretch of 100 degree heat, I just have to say how grateful we are to the folks at Greiner for the amazing Lennox a/c they installed for us! We've never had such great air conditioning. It's quiet, maintains a comfortable temperature, and there are no drafts. Thank you Greiner!" - R R., Google review
More Reviews

Replacing your system

A new system has to keep up through our summer heat waves without running all afternoon. A design specialist looks at your home, your ductwork and where your equipment sits before we quote anything. Every replacement gets a city permit, and we handle it from start to finish.

Systems we install

  • Central air conditioners
  • Gas furnaces
  • Heat pumps
  • Ductless mini-splits
  • Packaged units

We are a Lennox and American Standard dealer. For the rest of Solano and Yolo County, see AC installation and furnace installation.

Repairs and water heaters are on our Vacaville home service page.

Why Vacaville homeowners call Greiner

  • Family-owned and serving Solano and Yolo County since 1991
  • Same-day service, 7 days a week
  • We answer the phone with “How can we make you smile?”
  • Friendly, well-groomed, polite technicians. Our reviews say so.
  • Rated 5.0 on Google with more than 1,600 reviews (September 2026)
  • California contractor license CSLB #365955

Vacaville questions we hear

Should I repair my system or replace it?

If a repair is reasonable, we will tell you. If the system is old and the repairs are adding up, a design specialist can price a replacement so you can compare the two.

Gas furnace or heat pump?

A heat pump heats and cools with electricity, while a gas furnace heats and pairs with an air conditioner for cooling. We install both and can price both for your home.

Do you service the systems you install?

Yes. Our technicians service and maintain the equipment we install, and we can set up regular maintenance visits.