AC Installation Fremont | New Air Conditioner Replacement

Air Conditioner Installation & Replacement for Fremont Homes

AC installation in Fremont starts with a load calculation for your specific home, not a guess based on square footage. A complete new central air system typically runs $8,500 to $16,000 installed, including the city permit and the HERS duct test California requires. We give you written options, and the price you approve is the price you pay.

Many Fremont homes were built between the 1950s and the 1980s without central air, then had a system added later that was sized by rule of thumb. An oversized AC cools fast but leaves the house clammy and cycles itself to an early death. We size the new system to your walls, windows, insulation and orientation, then match it to ducts that can actually carry the air.

What a proper installation includes

Every ComfortFlow replacement follows the same checklist so you are not comparing apples to oranges between quotes:

Manual J load calculation and duct inspection
City of Fremont mechanical permit and final inspection
Title 24 HERS verification, including duct leakage testing when required
New line set or flushed line set, new pad and disconnect where needed
Matched indoor coil and outdoor unit for rated efficiency
Startup, refrigerant charge verified by measurement, and a walkthrough of the thermostat
Haul-away and recovery of the old refrigerant

Air conditioner or heat pump?

A heat pump is an air conditioner that also heats. In Fremont, where winter nights rarely drop much below 40°F, a modern heat pump can replace both the AC and the gas furnace. With Bay Area gas furnace rules tightening in 2029, many homeowners are making the switch at replacement time. We will price both so you can compare.

For a bedroom addition or an ADU without ducts, a ductless mini-split is often the cleaner answer.

Planning your budget

The federal 25C tax credit for AC and heat pump installs ended for equipment placed in service after December 31, 2025. Local programs still change through the year, so we check what applies to your address before we quote. For a full breakdown of what drives price, read our Fremont AC replacement cost guide.

Typical costs in Fremont

Job	Typical range
AC condenser + coil swap (existing furnace)	$6,500–$11,000
Complete AC + furnace system	$11,000–$19,000
Duct repair or sealing add-on	$800–$3,500
New ductwork (whole home)	$6,000–$12,000

Ranges reflect recent Fremont-area jobs and change with equipment, access and parts. You get an exact, written price before any work starts.

Looking for more than one fix? ComfortFlow is a full-service HVAC company in Fremont, so one call covers heating, cooling and hot water.

AC installation: questions we hear often

How long does an AC installation take?

A straight replacement usually takes one day. Adding AC to a home that has never had it, or replacing ducts, takes two to three days.

Do I need a permit to replace my AC in Fremont?

Yes. The City of Fremont requires a mechanical permit for AC replacement, and California energy code often requires HERS testing. We pull the permit and schedule the inspections.

What size AC does my Fremont home need?

It depends on insulation, windows, shade and layout more than square footage. A load calculation is the only honest answer, and it is included with every quote.

Can you install AC in a house with no ducts?

Yes. We can add ducts through the attic or crawlspace, or use ductless mini-splits for a cleaner install with no new duct runs.

Which brands do you install?

We install equipment from established manufacturers and will recommend based on parts availability and support in the Bay Area. Ask us for a side-by-side.