SAN ANTONIO GUIDE
What to do the same day the cooling stops
The thermostat is set well under the room temperature, the registers are barely moving or blowing warm air, and the afternoon heat is already in the walls. In San Antonio that is not a problem to study for a week. A long cooling season means a failed air conditioner can turn a house dangerous on an ordinary summer day, not only during a named storm. This is a same-day checklist: who leaves, what you can check without opening a cabinet, and what you leave alone.
Who should not wait in the house
Older adults, infants, and anyone who already feels ill should not stay in a house that is climbing and cannot cool. Move them to a cooler place: a cooled room you can still use, a neighbor, a public building that is open, or a car with working air conditioning once it is safe to drive. If someone is in distress, call emergency services. This page will not coach you through symptoms, medicines, or how much water a person needs. Distress is the line for emergency services. A repair appointment is not that line.
A healthy adult who is comfortable enough to wait for a technician is in a different position from a household that includes those people. Say so when you call. A company that can arrive in the evening is not a medical plan, and a medical plan is not something this guide provides. Heat is the emergency. The equipment is the reason the heat is indoors. Treat the people first, then the condenser.
Checks that do not open a cabinet
Look at the thermostat before you assume the compressor died. Confirm it is set to cool, that the setpoint is under the room temperature, and that a schedule did not push the temperature up while you were out. If the screen is blank, replace the batteries if the model uses them. Fan set to on, with cooling off, will move attic-temperature air and feel like a failure. Those settings are walked through in thermostat troubleshooting. If a change of mode brings cooling back, you still want to know why the schedule fought you, but the afternoon is no longer an emergency.
Feel whether air is moving at a supply register. A filter you can reach without climbing a hot attic can come out if it is packed solid. Note a tripped breaker and reset it once only if you see no scorch, smell no burning, and hear no buzzing. If it trips again, leave it off. Look outside: is the fan spinning, or is the cabinet silent, or is it humming and stuck. Write that down for the technician. Do not remove the service panel to see why.
What you do not bypass
Do not add refrigerant. A can from a parts counter is not a same-day fix, and handling refrigerant is not a homeowner task. If someone offers to top the charge off without looking for a leak, that offer is not your emergency plan. Read refrigerant basics after people are safe, so the repair conversation does not start with a top-off. Do not jump out or tape down a float switch, a pressure switch, or any other safety control to force the unit on.
Do not open the outdoor electrical compartment. Capacitors can hold a charge. Do not chip ice off a frozen line and then restart cooling against the block. Do not pour water through the fan while it is running. A hose on a powered condenser is how a cooling emergency becomes an electrical one. If you smell gas anywhere in the house while you are dealing with the heat, leave, do not flip switches, and from outside call the gas emergency number on the CPS Energy bill.
A dark neighborhood versus a dead unit
CPS Energy is the city-owned electric and gas utility. If the block is dark, the neighbors are dark, or the utility has posted an outage, the condenser is not going to run until power returns. Chasing a technician for a powered-off outdoor unit wastes the hour you could spend getting vulnerable people to a cooler place. Emergency utility numbers come from the bill, not from this article. A single house with power at the lights and a silent condenser is an equipment problem, and that is when the repair call matters.
A float switch in a full attic pan also looks like a dead system while the rest of the house has power. Water stains on the ceiling mean you turn cooling off and stay out from under the wet gypsum. That shutdown is the equipment protecting the ceiling. Bypassing it to survive the afternoon trades a hot room for a collapsed one. Tell the dispatcher about water, ice, a humming outdoor unit, or a fan that will not turn. Those words change who they send and what truck stock matters.
While you wait for a person with tools
Close blinds on sunlit glass, stay in the lowest floor if it is cooler, and use a fan only where it actually helps someone who is safe to remain. A fan does not cool a closed house the way an air conditioner does. It moves air. If the indoor temperature keeps rising and the people who should not wait are still inside, go back to the first step and move them. Do not decide they can endure it because a truck is on the schedule.
The longer diagnosis, once everyone is safe, is the summer failure itself: attic heat, airflow, a frozen coil, and a condenser that runs without cooling. That walk-through is in why the house stays warm. Use it to brief the technician. Do not use it as a reason to spend the peak of the afternoon on a ladder in the attic. Tell them about the attic hatch, pets, and a gate code so the visit does not stall in the driveway.
After this day, before the next one
When cooling is back, write down what the technician found and what they did not open. A same-day rescue that added refrigerant, jumped nothing, and left a leak unnamed is an unfinished repair. Ask for the part name or the measurement. If the fix was a drain, ask whether the pan and the switch were tested or only emptied. Keep that note with the filter size and the thermostat model.
The visit that prevents the next scramble is a spring start-up, before the long run, not another dusk failure in July. What to have checked on a milder attic day is in seasonal maintenance. A forecast from the National Weather Service will not repair a condenser, and it will tell you when the next stretch of heat is coming so you are not discovering a dead system at sunset. This checklist is for the day the cooling stops. It is not a substitute for the repair.
Questions on a no-cool day
Is every warm house a no-cooling emergency?
No. A system that is keeping the house close to the setpoint on a hot afternoon is doing the work this climate asks. The emergency is no cooling, or cooling so far behind that the indoor heat is dangerous for the people there. Older adults, infants, and anyone already ill should leave that situation. Someone who is in distress needs emergency services, not a blog and not a waiting list.
Can I recharge the system myself to get through the night?
No. Do not add refrigerant. A low charge usually means a leak, and a can added in a hurry can overcharge a system or put the wrong substance in the lines. It also does not fix a failed capacitor, a stuck fan, or a float switch in a full pan. Get people to a cooler place if they should not wait, and let a technician handle the refrigerant circuit after measuring it.
What if the power is out across the block?
Then the air conditioner cannot run, and a repair truck cannot change that. Check whether the outage is wider than your panel, using what CPS Energy publishes and what you can see on the street. Use the emergency number on the bill for a gas smell or a downed line situation the utility tells you to report. Spend the effort moving heat-vulnerable people to a cooled place rather than resetting a condenser that has no supply.
Should I tape the float switch so the blower comes back on?
No. Do not jump out or tape down a safety switch. The switch is often the only reason attic condensate is not pouring through the ceiling. A wet, sagging ceiling is a reason to stay out of that room and to keep the cooling off. Tell the technician about the water. A hot afternoon does not make a bypass reasonable.
Does this page replace medical advice in the heat?
No. The only health direction here is to get to a cooler place and to call emergency services if someone is in distress. It does not describe treatments, doses, or how to decide that a person is fine to endure the heat. If you are unsure whether someone is in distress, treat that uncertainty as a reason to call emergency services rather than as a reason to wait for an HVAC truck.
Sources (checked October 6, 2026)
We link to these organizations for reference only. None of them is affiliated with this site.
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