HVAC Services in San Antonio, TX

Heating and Cooling in San Antonio

San Antonio's cooling season runs from roughly April to October and the heating season is short and mild. Equipment here is sized and selected almost entirely for cooling, and the biggest wins are usually in the distribution system rather than in the equipment itself.

The Attic Is the Problem

In most San Antonio homes the air handler and the entire duct system sit in an unconditioned attic that reaches 140-150°F in summer.

• Duct leakage in an older system commonly runs 20-30%. That fraction of your cooled air is delivered to the attic, and the return draws superheated attic air back into the system.
• Conduction through thin or compressed duct insulation warms the air across the run, so the far bedroom receives air several degrees warmer than what left the coil.
• Radiant gain through the ceiling from a 150°F attic is a substantial share of the cooling load.

What to do, in order of value:

1. Seal the ducts. $1,800-$4,500, and it usually returns more comfort per dollar than any equipment change.
2. Radiant barrier on the underside of the roof deck. $1,500-$4,000, dropping attic temperature 20-30°F.
3. Attic insulation to R-38 or better. Many older San Antonio homes have R-11 to R-19.
4. Balanced ventilation — soffit intake matched to ridge exhaust. Blocked soffit vents are extremely common and make ridge venting useless.

Only after those should you consider a larger system. A contractor proposing more tonnage without measuring duct leakage is solving the wrong problem.

Sizing and Humidity

San Antonio is humid enough that oversizing causes real comfort problems.

An air conditioner dehumidifies only while it runs. An oversized unit satisfies the thermostat quickly and shuts off before removing much moisture, leaving the house cold and clammy. It also short-cycles, which wears the compressor.

Insist on a Manual J load calculation. Rules of thumb based on square footage systematically oversize, especially in a house that has just had its ducts sealed and attic insulated. The right answer is often smaller than what is currently installed.

Two-stage and variable-speed equipment runs long cycles at reduced capacity, which dehumidifies far better than single-stage. In this climate the premium is generally worth paying.

Heat Pumps Make Sense Here

San Antonio's heating load is modest and its cooling load is large, which is close to ideal for a heat pump. One piece of equipment covers both seasons, and modern units handle the handful of genuinely cold nights with electric backup heat.

Where a furnace and an air conditioner both need replacing, a heat pump often costs little more than the pair and removes gas venting from the equation. CPS Energy has historically offered rebates on high-efficiency heat pump installations, sometimes substantial ones.

Licensing and Rebates

TDLR ACR licence — Class A (unlimited tonnage) or Class B (limited). Individual technicians register under a licensed contractor. Verify at the TDLR lookup.

CPS Energy runs one of the larger municipal utility efficiency programmes in the country, historically covering:

• High-efficiency air conditioning and heat pump replacement.
• Attic insulation and air sealing.
• Duct sealing.
• Solar.
• Income-qualified weatherisation at no cost.

Terms change annually, eligibility often depends on specific model numbers, and many rebates require a participating contractor. Check before you buy, not after.

Costs in San Antonio

Maintenance for a Long Cooling Season

• Change filters every one to two months in cooling season. A restricted filter cuts airflow, reduces dehumidification, and can freeze the coil.
• Clear the condensate drain line twice a year. A system running six months straight produces a great deal of condensate, and a line clogged with algae backs up into the attic and through the ceiling. A cup of vinegar in the access tee quarterly prevents it.
• Confirm a float switch on the secondary drain pan, which shuts the system down before the ceiling is damaged.
• Wash the outdoor coil annually. Cottonwood and oak pollen blanket condensers here.
• Service in March, before the rush. By June every contractor in Bexar County is on emergency calls.

Tips for San Antonio Homeowners

1. Fix the ducts before buying more tonnage. It is cheaper and it usually works better.
2. Insist on a Manual J. Oversizing causes the humidity complaints people blame on undersizing.
3. Add a radiant barrier. In this climate the payback is short.
4. Pour vinegar down the condensate line quarterly. It prevents the most common ceiling damage event here.
5. Check CPS Energy rebates first. They are among the better utility programmes in the country.