AC Installation in Modesto, CA
A new air conditioner in Modesto will run from May through September every year. Tell us about the house, and a licensed contractor who covers Stanislaus County will get in touch.
Tell us about the job
It takes about a minute.
Five months of Modesto heat, every year
From May through September your air conditioner is the only thing standing between the house and a 91°F afternoon. That is the stretch it has to work, and the unit you put in now is the one that will carry those five months for years to come.
Any new central air conditioner installed today has to meet 14.3 SEER2, the federal minimum since 2023. That baseline is worth knowing when you are comparing what a contractor quotes you, since anything on the market meets it or beats it.
- 5 months
- May through September, your air conditioner is on duty
- 91°F
- the average summer afternoon it cools against
- 1 hail events
- in ten years, and hail bends the fins on outdoor coils
- 13.4 SEER2
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
A higher-efficiency unit would save about $30 a year to run in Stanislaus County compared with a new unit at the federal minimum.
Estimates for a typical Stanislaus 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 by the Contractors State License Board, and it covers the contractor, not any one job. The board tested that contractor before granting it and keeps a record of who holds it, so the same license that lets them take on this installation stands behind every other job they do.
That license is what to rely on here, since California is a licensing state. Beyond it, most cities and counties in California require a permit from the local building office to install an air conditioner, with an inspection once the work is done. That permit and inspection come from the city or county, separate from the state license, and they are what checks the work itself once it is in the wall or on the pad.
Sources: California Legislative Counsel · Contractors State License Board
- What size air conditioner does my house need?
- There's no single number that works for every house. The right size comes from a load calculation that a contractor runs on your home, looking at square footage, insulation, window placement, and how much shade the house gets. Summers here average 91°F and the cooling season runs May through September, so an undersized unit will run constantly and still struggle to keep up. An oversized one cools the air fast but shuts off before it pulls the humidity down, which leaves rooms feeling clammy. A contractor doing the calculation is the only way to get this right.
- Should I replace the whole system or just the outdoor unit?
- If the indoor and outdoor units were installed together and matched to work as a pair, replacing only the outdoor unit usually causes problems. Mismatched coils and refrigerant metering can cut efficiency and shorten the life of the new unit. Age matters too. If the indoor coil is old, it may fail soon after and you'll be paying for two jobs instead of one. A contractor can check whether your indoor coil is still compatible with a new outdoor unit before you decide.
- Do HVAC contractors in Modesto 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. Ask to see the license number before work starts, and you can look it up directly with the board to confirm it's current.