California HVAC Match
An outdoor air conditioning condenser unit positioned beside a blue-sided house at sunset.

AC Installation in Santa Rosa, CA

Tell us about the house, and a licensed contractor who covers Sonoma County will get in touch.

Tell us about the job

It takes about a minute.

Step 1 of 3: Equipment
An outdoor air conditioning condenser unit positioned on a concrete pad next to a blue-sided house, surrounded by green shrubs and flowering hydrangeas at sunset.

Santa Rosa doesn't ask much of an air conditioner

Summer afternoons here average 79°F. That's mild, and it means a new system in Santa Rosa isn't fighting the kind of heat that pushes equipment hard for months at a stretch.

Any new central air conditioner installed today has to meet 14.3 SEER2, the federal minimum. In a climate this mild, that baseline efficiency is doing its job most days it runs. What matters more here is a system sized right for your house, so it cools evenly without cycling on and off more than it needs to.

79°F
the average summer afternoon it cools against
20 hail events
in ten years, and hail bends the fins on outdoor coils
13.4 SEER2
the federal minimum any new unit must meet
Isometric illustration of a cutaway single-story house showing interior rooms, ductwork running from an indoor air handler, and an outdoor condenser unit on a pad beside the building.
Your air conditioner works hardest from July through September.

NOAA nClimDiv, 1991–2020 normals

Overhead view of a gray residential air conditioning condenser unit mounted on a concrete pad beside a house with asphalt shingle roofing.

Going above the federal minimum saves little here, about $10 a year.

  • A higher-efficiency unit$100 a year
  • A new unit at the federal minimum, 14.3 SEER2$110 a year

Estimates for a typical Sonoma County home, from EIA household energy data, California fuel prices and NOAA climate normals. Your home will differ.

California requires HVAC contractors to hold a state license.

The license is issued to the contractor, not the job. It covers this contractor's standing with the state, tested and recorded by the Contractors State License Board, rather than a check on this particular installation.

In most cities and counties here, installing an air conditioner needs a permit from the local building office, with an inspection once the work is done. That inspection is what checks the installation itself, separate from the contractor's license.

Sources: California Legislative Counsel · Contractors State License Board

What size air conditioner does my house need?
The right size comes from a load calculation, not the square footage of your house alone. A contractor looks at your insulation, window area, ceiling height, and how much shade your walls get before landing on a number. An oversized unit cools the air fast but shuts off before it pulls the humidity down, and an undersized one runs constantly and still can't keep up on the hottest afternoon. Ask whoever quotes the job to show you the calculation, not just a guess based on the last house they worked on.
Should I replace the whole system or just the outdoor unit?
In most cases you replace both the outdoor condenser and the indoor coil together. They're matched to work at a specific capacity and efficiency, and pairing a new condenser with an old coil usually means the system never reaches the rating either part was built for. It can also void the manufacturer's warranty on the new equipment. A contractor can tell you whether your existing coil and ductwork are in good enough shape to keep, but if the outdoor unit is old, the coil usually is too.
Do HVAC contractors in Santa Rosa need a state license to work on my home?
Yes. California requires HVAC contractors to hold a state license, issued by the Contractors State License Board. Before work starts, ask for the license number and check it against the CSLB's records. It's a quick way to confirm the person in your driveway is who they say they are.
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