AC questions, answered

Published 2026 national figures put most AC repairs at $250 to $700, with a $375 average (Fixr), or $150 to $650 for common fixes (This Old House). A capacitor is at the low end; a compressor runs $600 to $3,000 or more. Stockton prices vary by company, so get the price in writing before work starts.

Often not, if the repair is a big one. A compressor or coil on an old system is a lot of money for a unit near the end of its life. A capacitor or contactor on the same unit is cheap and usually worth doing. This Old House puts the typical life of a home cooling system at 12 to 15 years.

Not always. On a 105 degree afternoon an older or undersized system can fall behind and still be working. The test is the evening: Stockton's July nights now average about 61.1°F at the airport, so a healthy system should catch up after sunset. If it never does, or the air at the vents isn't cold, something is wrong. A dirty filter and a weak capacitor are the usual causes. A refrigerant leak is the next suspect.

Yes. California requires a permit for an HVAC replacement and a test of the new system by an independent rater, and the contractor pulls the permit. In the city of Stockton that goes through the Permit Center. A contractor who offers to skip the permit is skipping the test that checks your ducts.

An independent HVAC company that serves your ZIP and holds a California C-20 license, the classification for heating and air conditioning work. Stockton Cooling Line is a referral service: we hand your request to a local company so you don't have to phone around. You can check any contractor's license on the CSLB website.

No. This site is for home air conditioning and heating. For a car, you need an auto repair shop.

A C-20 license from the Contractors State License Board (the HVAC classification), for any job of $1,000 or more in labor and materials or any job that needs a building permit. Check the license number at cslb.ca.gov before you sign.

California caps the down payment on a home improvement contract at $1,000 or 10 percent of the contract price, whichever is less, according to the CSLB. Later payments shouldn't get ahead of the work done.

On PG&E's standard E-TOU-C plan, the peak price window is 4 p.m. to 9 p.m. every day. On E-TOU-D it is 5 p.m. to 8 p.m. on weekdays. Cooling the house down before the window starts and letting it drift a few degrees during it lowers the bill. Lodi homes on Lodi Electric Utility have different rates.

Often, yes, from June through September. The airport's July nights average about 61.1°F, more than 30 degrees below the afternoon high. Open up once the outside air is cooler than inside, close the windows and blinds in the morning, and the AC has less to do in the afternoon.

Yes. That includes Lodi and Manteca, Tracy and Lathrop, plus Ripon and Mountain House. The company that calls you back confirms your address is in their service area.

That changes with the week; a July heat wave fills calendars fast. If the house has lost cooling and an elderly or ill person lives there, put that in the request so the company can move it up where possible.

No. The HVAC company pays Stockton Cooling Line for the introduction. You pay the company only for work you agree to.

Fixr's national figures put a new central air system at $5,800 to $14,400 installed, with an $8,750 average. Stockton quotes vary with the size of the house and the ductwork.

Yes. A permit and an independent test of the installed system are required when an HVAC system is replaced. The contractor normally pulls the permit and schedules the test.

It depends on the house, not a rule of thumb. Ask the contractor for a load calculation (Manual J) that accounts for the insulation and the windows.

Most home systems are sized to hold a certain difference between indoor and outdoor temperature. On the hottest afternoons the house can drift above the setpoint even with a working system. If the vents blow warm air or the system ices up, that is a failure.

The county's Office of Emergency Services opens cooling centers at libraries and community centers during heat advisories and lists them on sjready.org.

No. According to EPA, existing systems are not restricted, and repairs, R-410A replacement parts included, remain allowed.

Yes, but only when every component was manufactured or imported before January 1, 2025, which is the carve-out in EPA's May 2026 reconsideration rule. Anything built from newer parts has to use a refrigerant below 700 GWP.

Only as reclaimed or previously produced refrigerant, which is why recharging an R-22 system costs much more than an R-410A system.

Nationally, Fixr's 2026 figure is $250 to $700 for most repairs and $375 on average. This Old House has common fixes at $150 to $650, with the outer edges of its range at $100 and $1,000.

Fixr's installed price for a new central system is $5,800 to $14,400, averaging $8,750. System size and the state of the ducts move the number most, and in California the permit and field test come with the job.

You are paying mainly for the drive out and the technician's hours. The part itself is a minor line on the invoice.

For a small repair like a capacitor or contactor, often yes. For a compressor or coil, usually not. Get a replacement price before approving a big repair on a system that old.

Multiply the system's age by the repair cost. Over 5,000 suggests replacing, under suggests repairing. It is a rough guide, most useful for big repairs on old systems.

Sometimes, from reclaimed refrigerant, but it is expensive because R-22 is no longer produced. A leaking R-22 system is usually a candidate for replacement.

In Stockton the usual suspects are a dead capacitor or condenser fan motor, an indoor coil iced over behind a dirty filter, refrigerant lost to a leak, or a thermostat left on Fan instead of Cool. Look at the filter and both breakers before calling.

Start with the capacitor, a frequent cause of that hum. It keeps a charge after the power is cut, so let the technician handle it rather than opening the panel.

Only for very small jobs. California lets an unlicensed person do work under $1,000 total in labor and materials, with no employees and no permit. Anything bigger, or anything needing a permit, requires a licensed contractor, which for AC is a C-20.

Yes. California requires a permit and an independent test when an HVAC system is replaced. In the city of Stockton the permit comes from the Permit Center; other cities and the county have their own building departments.

An independent rater checks the installed system, including duct leakage, to confirm it meets California's Energy Code. The contractor schedules it after installation.

Most repairs, like a capacitor or fan motor, don't. Replacing the system or its major components does. Ask the contractor if you are unsure.

This Old House lists AC tune-ups at $65 to $200, with a $133 average. Some companies sell yearly maintenance plans that include one.

Once a year, in spring. The summer is long and dry here, so the outdoor coil gets dirty fast.

Common causes are a leaky or crushed duct to that room, a duct that was undersized from the start, or a room with more sun and less insulation. A technician can measure airflow at the vent.

Fixr lists air duct cleaning at $300 to $700, with a $500 average. Cleaning doesn't seal leaks.

It is when someone at home is at risk from the heat: older adults, infants, people with heart or lung conditions, or anyone showing signs of heat illness. Move them somewhere cool first.

No. Turn the system off and run the fan so the ice melts. Running it frozen can damage the compressor.

Often, yes. Ask the company what their after-hours fee is when you call.

Common causes are a thermostat set to fan on, a dirty flame sensor, a failed igniter, or a furnace that overheated because of a clogged filter. Check the filter and the thermostat first.

Fixr lists furnace repair at $349 to $650, with a $485 average.

Yes. January nights at the airport average around 40 degrees, well within what a modern heat pump handles.

Fixr lists heat pump installation at $5,000 to $15,000, with an $8,350 average. Ductwork and electrical upgrades can add to that.

If the furnace and the air conditioner are both old, get a price for a heat pump alongside a price for a new AC and furnace. One heat pump replaces both.

That sits well past what either price guide shows: This Old House has the installed job at $80 to $400 and Fixr at $100 to $400. Find out whether the quote bundles other work, and ask for the line items on paper.

The CSLB says the down payment can't be more than $1,000 or 10 percent of the contract price, whichever is less.

Per the CSLB's contract guide, a home buyer of goods or services sold in the home has three business days to cancel, or five for a buyer 65 or older. The contract should carry a cancellation notice; read it. General information here, not legal advice.

Fixr lists ductless installation at $4,577 to $8,328, with a $6,357 average. More zones and electrical work raise the price.

Yes. It is one of the most common uses, because a converted garage usually has no ductwork. Size it for the room, including any west-facing walls or uninsulated garage doors.

On the standard E-TOU-C plan, peak pricing runs 4 p.m. to 9 p.m. every day. On E-TOU-D it runs 5 p.m. to 8 p.m. on weekdays. Check your bill for your plan.

On a time-of-use plan it usually does, because it shifts cooling out of the most expensive hours. Cool the house before 4 p.m. and let it drift a few degrees during the peak window.

Lodi Electric Utility lists home improvement rebates for central air conditioners, air source heat pumps, whole house fans, duct sealing with testing and smart thermostats. See its rebate applications for the current amounts.