SAN ANTONIO GUIDE

When another repair stops being the whole answer

The outdoor unit is loud, the supply air is barely cool, and someone in the driveway is already talking about a new system while the attic hatch is still closed. Replacement can be the right ending. It can also be a speech that started before the fault was named. In a long San Antonio cooling season the useful question is whether this failure is a part, a leak that will return, or equipment that can no longer be matched and serviced. Age is a clue. It is not a calendar rule.

By Mike Maziarz · Sources checked October 6, 2026 · How we write these guides

Name the fault before the changeout

Ask what failed, in words a neighbor could repeat. A capacitor, a contactor, a thermostat, a clogged condensate trap, and a compressor are not the same sentence. A company that cannot say which of those it found has not finished the diagnosis, even if the attic is miserable and everyone wants the house cool tonight. Hot weather is a reason to work carefully. It is not a reason to skip the noun.

Write down the model numbers from both cabinets if you can photograph them without opening electrical compartments. Note how many times this same symptom has returned, and whether anyone added refrigerant to get through a weekend. A one-time electrical part on equipment that still has parts available is a repair conversation. A story that only says the system is old is not yet a finding. You can approve a repair and still plan a replacement later, on a milder day, with more than one written scope.

When a repair is still the right job

A float switch that opened because the drain clogged, a blower capacitor that failed, a contactor burned at the points, or a thermostat that lost its schedule are repairs. They do not become a replacement because the visit happened in August. If the coil is intact, the compressor starts and stays on, and the refrigerant circuit was not the problem, putting in a new system to solve a drain is how attics get expensive stories instead of clear fixes.

Filters, batteries, and debris on the outdoor coil are not replacement criteria either. The line between those chores and the work that belongs to a licensed technician is drawn in what to handle yourself. If the furnace is the appliance that failed, and the air conditioner is a separate machine that still cools, do not let a no-heat visit talk you into scrapping both without a look. Ignition faults have their own path in why a furnace will not ignite.

Patterns that point toward replacement

A compressor that failed on a system whose indoor coil is corroded, leaking, or built for a refrigerant the outdoor unit can no longer share is a replacement pattern. So is a coil leak that was repaired and came back, then came back again. Repeated refrigerant additions without a found and fixed leak are a pattern, not a maintenance plan. Parts that the supplier cannot get for that model number are a pattern. One unavailable decorative panel is not.

A cracked heat exchanger on a gas furnace is a safety problem, not a bargain repair. Combustion that spills, soot at the draft hood, or a carbon monoxide alarm that sounded when the heat ran are reasons to stop using the furnace until a technician inspects it. Get everyone outside and call emergency services if an alarm is going off or people feel sick and improve outdoors. The safety steps live in carbon monoxide safety. Do not keep the furnace in service to delay a replacement you have not decided on.

Matching the indoor coil, the lines, and the attic

Swapping only the outdoor condenser and leaving a tired indoor coil is sometimes proposed because the attic work is the hard half. In this climate the air handler is often in that hot attic, on a platform, with a drain pan and a line set that has to survive another long cooling season. The new outdoor unit has to match the indoor coil, the metering device, and the refrigerant the nameplate calls for. A mismatch can cool poorly, short-cycle, or fail early, which puts you back in the driveway.

Ask whether the line set will be replaced or flushed, whether the pan and the primary drain will be redone, and whether the pad under the outdoor unit is sound. Limestone is the local ground. It does not pick the equipment. A cracked, sloped pad still needs an answer so the new cabinet does not inherit a strain on the pipes. Ask what happens to the old refrigerant. It is not vented to the alley as a step in the changeout.

Urgency in dangerous heat

A replacement quote can wait until morning. A person who is already ill, an older adult, or an infant in a house with no cooling may not. Get them to a cooler place, and call emergency services if someone is in distress. That choice is separate from signing for equipment. The same-day checklist for a house with no cooling is in no-cooling emergency steps. Use it for safety, not as a reason to approve the largest option on a tablet.

If the system can be made safe and cool with a repair that the technician will stand behind, that repair can bridge the season. Ask how long the part is expected to be available, what warranty the company puts on the labor, and what they will not warrant because of the rest of the system. Those sentences belong on the invoice. A verbal promise in the attic does not travel well. If they cannot cool the house safely tonight, ask what temporary step they recommend that does not include jumping a safety switch.

A decision you can reread tomorrow

Take the written findings home, or at least to the kitchen table, before you accept a changeout you did not expect when you called. You want the failed part, the measurements that support it, the parts that are still sound, and the scope of a replacement if you choose that path. Duct leaks, a crushed return, and a thermostat in a sunny window can make new equipment look weak. Ask whether those were checked or explicitly left out.

There is no age in years, published on this page, that flips a repair into a replacement. A young system with a ruined coil can be done. An older system with a failed capacitor can be worth repairing. The Texas Department of Licensing and Regulation license tells you the contractor is allowed to do air conditioning and refrigeration work. It does not pick the option. CPS Energy will still be the utility after either choice. Compare two scopes that name the same equipment, and keep the photographs of the nameplates with the paperwork.