San Marcos · Hays County

AC and heating repair in San Marcos, TX

AC, heat pump and furnace calls from San Marcos, TX (78666). Tell the dispatcher what the system is doing and roughly when it went in; the call is routed to an independent contractor working that ZIP code, if one is available.

Call (888) 217-3739

The line is answered 24/7. Visits depend on which contractors are working your ZIP code.

How a call from here works

1. Say what the system is doing Not cooling, not heating, iced lines, water at the attic unit, a breaker that trips. Add the thermostat setting and what the house actually reads.

2. A contractor is matched by ZIP code The line routes the call to an independent heating and cooling contractor taking work in that ZIP code. Coverage shifts during the day; a match is not promised.

3. Visit, findings and figure come from that contractor The contractor books the visit, diagnoses the system and quotes any repair or replacement. This site sets no figures and sends nobody.

The 78666 ZIP code covers most of San Marcos and also about a quarter of the land inside Kyle's city limits, on Kyle's south side (Census 2020 relationship file). A call from 78666 can come from a 1970s house in an older San Marcos neighborhood or a 2015 subdivision that pays its city taxes to Kyle.

A wider range of housing ages

San Marcos is older and more varied than Kyle. The median home in the city was built in 2001, against 2010 in Kyle, and only about 52% of San Marcos homes date to 2000 or later (Census ACS 2020–2024). About 14% were built in the 1980s and more before that. Detached single-family houses are about a third of the housing; most of the rest is apartments and attached homes.

Mostly electric heat

About 71% of San Marcos households heat with electricity and about 26% with natural gas. A heat pump or electric strips are the most common setup, with gas furnaces more common in some older neighborhoods.

What that means for a call

Older houses. A house from the 1970s or 1980s is on its second or third system. The install year on the outdoor data plate is the number to give, and ducts may be original and worth a look.

Newer subdivisions, including the Kyle side of 78666. Systems from the 2000s and 2010s, where the same replacement questions as in Kyle apply.

City limits matter for permits. An address in 78666 can sit inside San Marcos, inside Kyle, or outside both. Kyle requires a permit for equipment replacement; San Marcos runs its own permit office. Ask the contractor which applies to your address.

Weather

The San Marcos station's NOAA 1991–2020 normals put the average August high at 96.8°F and the August low at 73.7°F, with about 117 days a year at 90°F or above and about 20 nights at or below 32°F.