HVAC in Texas is a cooling trade that still has to survive a cold night. The hot season is long, so the coil, the condenser, and the ducts carry the year. Along the coast the equipment is also fighting humidity, and a clogged drain pan becomes a ceiling stain. In the north and in the hills a short freeze asks a heater or a heat pump to work on the week it was ignored.
Start with airflow and water, not with a wish for a bigger unit. A filter that has not been changed, a return that sucks from a hot attic, and ducts that leak into that attic will make any equipment look weak. A condensate line full of growth will shut a system down on the hottest afternoon or, worse, overflow quietly. Outdoor coils packed with cotton, dust, or yard debris cannot reject heat. Say those faults on the phone.
Listen for the failure you actually have. Warm air from the registers in July is a cooling problem: capacitor, refrigerant circuit, airflow, or a condenser that cannot breathe. No heat on the first hard night is a heating problem: strips, a furnace that has sat, a heat pump buried in ice, or a condensate trap that froze and then flooded when it thawed. Hail can bend condenser fins in the north. Floodwater can drown a pad-mounted unit on the coast.
Attic equipment lives in brutal heat for months. Insulation on the attic floor does not keep that equipment cool, and a platform that blocks the service panels makes the next repair slower and rougher. Ask where the drain goes and whether the exhaust is sound. If the far rooms suffer while the room over the unit is icy, say so. That is a balance problem.
Have the address, where the equipment sits, and what the house is doing right now: blowing warm, blowing nothing, leaking at the pan, or refusing to heat. Mention a recent storm only if hail, wind, or water actually touched the unit. Ask for a visit that checks airflow, drainage, and the heat side, not a speech about a new system before anyone has opened the panel. Call the number on this page.