Furnace and AC Tune-Ups in Modesto

Modesto gives you two clean windows for maintenance: late winter before the heat, and early fall before the fog. Both are the quiet months for heating and air companies, which is the point.

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Book in the quiet months

The research behind this site shows when Modesto calls for help. Searches for AC repair bottomed out at 390 a month in February and March 2026, then hit 1,900 in May and June. Furnace repair searches sat at 90 in August and climbed to 720 by November. The quiet months are when a company can give a tune-up its full attention, and when a weak part found on a tune-up can be ordered without anyone being hot or cold in the meantime.

So: air conditioning in March or April, heating in September or October. If you only do one, do the one for the season you are about to enter.

What a furnace tune-up should cover

Start-up sequence watched from inducer to blower, with any fault codes read
Flame sensor cleaned and igniter checked for cracks
Burners inspected and the heat exchanger looked at for cracks or rust
Venting checked for blockage, and condensate drain cleared on high-efficiency units
Gas pressure and temperature rise measured against the label
Filter checked, and the carbon monoxide alarm tested while someone is there

What an AC tune-up should cover

Outdoor coil cleaned of harvest dust, leaves and cottonwood fluff
Capacitor tested against its rating, not just looked at
Contactor checked for pitting and ants
Refrigerant pressures and temperatures measured, not topped up by habit
Indoor coil and condensate line checked, including the overflow pan in the attic
Airflow and filter checked; return grilles cleared

What it is not

A tune-up is not a sales visit, and a good one does not end with a list of urgent replacements on a system that was running fine. A technician should show you any problem they find: the capacitor reading below its rating, the rust on a burner, the photo of a crack. If a $90 tune-up ends with a recommendation for a $14,000 system, get a second opinion.

Things you can do between visits

Change or check the filter monthly in the fog and smoke seasons. Keep two feet clear around the outdoor unit and rinse its coil with a hose once in summer. Keep storage away from a garage or closet furnace. Pour a cup of vinegar down the AC condensate line in spring if it has a cleanout. And run the heat for an hour on a mild October afternoon, before you need it.

Maintenance plans

Many local companies sell a yearly plan covering both visits, often with priority scheduling. That priority can matter in the first cold week. Read what the plan includes, whether it renews automatically, and whether it covers parts or only labour.

Want a tune-up before the season turns? Call or send a request. A local heating and air company will schedule it.

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Common questions

How much is a furnace or AC tune-up in Modesto?

Local companies generally quote somewhere around $80 to $200 per system visit, less as part of a yearly plan. Repairs found during the visit are extra.

How often should I service my HVAC?

Once a year per system is the usual advice: the furnace before winter and the AC before summer. A heat pump, which does both jobs, benefits from both visits.

Does a tune-up help with my MID bill?

A clean coil and correct airflow reduce run time, which shows on the bill. The bigger gains are usually duct sealing and a correctly set thermostat.

Who does the tune-up?

An independent local heating and air company. We are an advertising and referral service and do not perform the work.

Other heating and cooling work in Modesto

Also serving

Tune-Ups is available beyond Modesto, across Salida , Riverbank , Ceres and Turlock .

Get help with tune-ups

Say what the system is doing and a local heating and air company will get back to you about a visit. Answered Mon–Sat, 8am–6pm · after hours we call back the same day Or call (209) 842-0950. If you have no heat or no cooling right now, calling is faster.