Heating — San Antonio, TX

Heating in San Antonio: what to know

In Texas the heating season is short — cooling dominates most of the year — so heating equipment is easy to neglect and often ends up undersized or aging. But Texas still gets occasional hard freezes (like the February 2021 storm) that force systems to run for days straight, and that is exactly when a neglected or undersized furnace or heat pump gives out. Two setups are common here: a gas furnace, or a heat pump (the same outdoor unit that cools in summer, running in reverse) usually backed by electric-resistance 'heat strips' for the coldest days. Because heating runs so little in Texas, small problems — a cracked heat exchanger, weak heat strips, a heat pump that has never been serviced — can go unnoticed until the one week you truly need heat.

What affects the cost

• System type and fuel: a gas furnace versus an electric heat pump with backup heat strips — different equipment, venting, and installation.
• Whether you are repairing or replacing only the heating side or the whole HVAC system (a heat pump shares its outdoor unit with cooling).
• Sizing for your specific home — a proper load calculation (Manual J) rather than guessing by square footage or matching the old unit.
• The efficiency rating of the equipment chosen (for example furnace AFUE or heat-pump HSPF) — higher-efficiency units cost more up front.
• Condition of ductwork, venting, and the gas line — a gas furnace needs safe combustion venting, and old or leaky ducts add work.
• Electrical capacity for heat strips or a heat-pump changeout, since a panel or circuit upgrade is sometimes needed.

How to choose a Heating contractor

• Verify the contractor holds a current TDLR Air Conditioning & Refrigeration (ACR) license, Class A or B — this is the Texas state license that covers heating and HVAC work, and you can look it up on the TDLR website.
• For a gas furnace, confirm who is handling the fuel-gas connection: in Texas that work is done by a licensed plumber (often with a gas endorsement), and many cities require a permit and inspection.
• Ask for a load calculation (Manual J) instead of sizing by square footage or simply matching the old unit — undersized systems are exactly what fail during a hard freeze.
• Get an itemized written estimate, and ask separately about the equipment manufacturer's warranty and the contractor's labor warranty.
• Because heating runs so little here, ask for a maintenance and safety check — including the heat exchanger on a gas furnace — so problems surface before a cold snap, not during one.