AC Maintenance & Tune-Ups in San Antonio
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Why maintenance matters here
In San Antonio the air conditioner carries most of the year. NOAA’s 1991–2020 normals show about 122 days a year at 90 °F or hotter and about 18 at 100 °F or more, and cooling degree days outnumber heating degree days about 2.2 to 1. A system that runs that much collects dust on its coils, clogs its drain and wears its electrical parts faster. A spring tune-up is the chance to catch a weak capacitor or a slow drain before the hottest weeks, when repairs are harder to schedule and after-hours rates apply.
The ENERGY STAR maintenance checklist
ENERGY STAR’s homeowner checklist covers both what you do and what a contractor does:
- Check the filter monthly. Inspect, clean or change it. A dirty filter can increase energy costs and damage equipment.
- Check the condensate drain. A plugged drain can cause water damage and affect indoor humidity.
- Pre-season check-ups. Have a contractor check the cooling system in spring and the heating system in fall.
- Contractor tune-ups typically include coil cleaning, a refrigerant-charge measurement and an airflow check; CPS Energy’s tune-up lists these.
The CPS Energy no-cost A/C tune-up
CPS Energy offers a no-cost High-Performance A/C Tune-up to eligible residential customers in single-family homes in its service territory. According to CPS, the tune-up covers airflow, the filter, condenser-coil cleaning, the indoor coil and blower, and a refrigerant-charge measurement. The system must be a working central AC or heat pump at least a year old, with no CPS tune-up in the past five years. The outdoor temperature must be at least 55 °F, so late-fall to early-spring slots may be limited, and the customer supplies the filter. Program terms can change; check CPS Energy for current details. CPS also runs AC rebates, explained in our CPS Energy rebate guide.
Filters and the condensate drain
Write the filter size down and buy a few at a time. A filter that is visibly gray, or that you can’t see light through, is due. When the AC is cooling, it pulls water out of the air, and that water runs down a condensate line. Algae and dust can clog it. Many systems have a float switch that shuts the AC off when the pan fills, which looks like a breakdown but is often a drain problem.
Attic air handlers and drain pans
Attic ducts and air handlers are common in San Antonio-area homes, and a DOE case study found vented attics here average about 130 °F. When the air handler sits above the ceiling, a clogged drain or an overflowing pan can stain or damage drywall below. Ask the contractor doing your tune-up to check the drain pan, any secondary drain line or shutoff switch, and the duct connections. ENERGY STAR says 20–30% of the air moving through ducts can be lost and recommends insulating attic ducts to R-6 or higher. More: attic AC ducts in Texas heat and duct cleaning and ductwork repair.
What AC maintenance costs
| Job | Typical range |
|---|---|
| AC tune-up / maintenance | $150–$350 (CPS Energy offers a no-cost tune-up to eligible customers) |
| Service call / diagnostic | $75–$200 (San Antonio guides: about $75–$150) |
| Capacitor or contactor replacement | $100–$450 |
| Air duct cleaning | $300–$700 (about $500 for a 2,000 sq ft home) |
Typical ranges from published cost guides (2024–2026) — estimates, not quotes. National figures unless marked San Antonio. See the full San Antonio AC & HVAC cost guide.
If the tune-up turns up a major problem on a system over 10 years old, ENERGY STAR suggests weighing replacement; compare on our AC replacement page.
Before you hire
- Get the company’s TDLR license number (it looks like TACLA… or TACLB…, ending in E or C for home AC) and look it up at the TDLR license search. Texas rules require that number on the company’s ads, both sides of its vehicles, proposals and invoices (16 TAC §75.71).
- The technician should be TDLR-registered or certified, and EPA Section 608 certified to handle refrigerant.
- A replacement needs a city mechanical permit in San Antonio, and suburbs should be checked. The contractor pulls it; in San Antonio, CPS Energy rebates require the permit number.
- Ask for a load calculation (Manual J) before replacing equipment.
- Get a written, itemized quote with model and serial numbers. Ask whether the diagnostic fee is credited to the repair and what the after-hours rate is.
- Get 2–3 quotes.
- If a CO alarm sounds, leave the house and call 911.
More detail: how to compare HVAC companies in San Antonio. This is general information, not legal advice.
Tune-up quotes around San Antonio
See also furnace and heating repair for fall heating check-ups, and how to compare HVAC companies in San Antonio.
AC maintenance FAQ
How much does an AC tune-up cost in San Antonio?
Published cost guides put an AC tune-up at about $150–$350. CPS Energy also offers a no-cost High-Performance A/C Tune-up to eligible customers in single-family homes, though slots depend on the outdoor temperature reaching 55 °F and the customer supplies the filter. Prices here are estimates, not quotes.
How often should I change my AC filter?
ENERGY STAR recommends inspecting your filter every month and cleaning or changing it as needed. In San Antonio, where the AC runs most of the year, that monthly check matters. A dirty filter can raise energy costs and damage equipment, leading to early failure. Note the filter size on the frame so replacements are easy to buy.
When should I schedule AC maintenance in San Antonio?
ENERGY STAR suggests a pre-season check of the cooling system in spring and the heating system in fall. In San Antonio that means booking before the 90-degree days arrive, typically in April or May, since contractors get busy from June through September. CPS Energy tune-ups need an outdoor temperature of at least 55 °F.
Why is water leaking from my AC in the attic?
Usually the condensate drain is clogged and the drain pan is overflowing. ENERGY STAR notes a plugged drain can cause water damage and affect indoor humidity. Turn the system off, check the pan if you can reach it safely, and have an HVAC contractor clear the drain and check any secondary drain or shutoff switch.
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