When your air conditioner quits in the middle of a Dallas-Fort Worth summer, the first hour matters more than any other. Indoor temperatures climb fast once the compressor stops working, and what starts as an uncomfortable afternoon can turn into a real health risk by evening. Here’s what to do first, how to keep your home livable while you wait for a technician, and how to tell when a fan and an open window aren’t going to cut it anymore.
Check These Two Things Before You Assume the Worst
Not every AC failure means a major repair. Start at the breaker panel: a tripped breaker is one of the most common reasons a system suddenly stops responding, and resetting it once is safe to try. Next, check the thermostat batteries and settings, since a dead thermostat can shut a working system down completely.
If the breaker holds and the thermostat is fine but the air still isn’t moving, the problem is likely inside the unit itself. Our guide on why an AC won’t turn on walks through the most common causes, and if the outdoor unit is dead silent, what to check when your AC has no power covers the next steps before you call anyone.
Cool the Room You’re In, Not the Whole House
Once you know the system needs a technician, stop trying to cool every room. Close doors to unused rooms and hang towels or blankets over the gaps to keep cool air where you need it and heat out.
Keep blinds and curtains shut on the sun-facing side of the house during the day; a surprising amount of heat gain comes through glass. After sunset, if it’s cooler outside than in, open windows on opposite sides of the house and run box fans to pull air through.
A fan pointed at your body cools you through sweat evaporation and moving air, not by lowering the room temperature, so it works best when you’re in the room with it running. For the room you’ll actually sleep in, our notes on the best temperature for sleeping through a Texas summer night are still useful for figuring out how to layer fans, ice, and airflow to get through the night.
Know the Signs Before Heat Becomes an Emergency
Heat exhaustion shows up as heavy sweating, dizziness, headache, nausea, and a fast pulse. Move to the coolest available space, drink water, and apply cool, damp cloths to the neck and wrists.
Heat stroke is more serious: confusion, hot skin that’s stopped sweating, a body temperature above 103°F, or loss of consciousness are emergencies that need 911, not home remedies. Infants, adults over 65, pregnant women, and anyone with a heart or respiratory condition are at the highest risk and should not be left in a hot house alone during a multi-day outage.
Pets feel the heat too. Dogs and cats can’t regulate their body temperature the way people do, so keep them in the coolest room, offer water often, and watch for excessive panting or lethargy.
A Wet Towel Buys Time, Not a Fix for a Failed Compressor
Fans, closed blinds, and a cool shower make a broken AC bearable for a few hours, but none of them address what actually stopped your system from cooling. If the issue is a refrigerant leak, a failed capacitor, or a compressor that’s stopped running, the unit needs a licensed technician, not another workaround.
Running a system that’s low on refrigerant or straining through an electrical fault can turn a repairable problem into a full replacement, so treat these temporary measures as a bridge to a repair appointment, not a substitute for one. If you’re not sure what’s actually wrong, our breakdown of the most common reasons an AC stops cooling can help you describe the problem accurately when you call.
When to Call for Emergency AC Repair Instead of Waiting Until Morning
Call right away if the breaker trips repeatedly after you reset it, if you smell burning or see smoke near the unit, or if the system is making a loud grinding or screeching noise. Any of those point to an electrical or mechanical failure that can get worse, and possibly dangerous, if the system keeps running.
Call the same night, rather than waiting until business hours, if the indoor temperature is still climbing after dark, if anyone in the home is very young, elderly, or managing a health condition, or if you have no realistic way to cool even one room. CityLine Air Conditioning provides emergency AC repair in Richardson and emergency AC repair in Dallas for exactly these situations, so you’re not stuck choosing between a hotel room and an unsafe house.
If you want a sense of what an after-hours visit typically involves before you pick up the phone, our DFW emergency AC repair guide covers what technicians check first and what tends to drive the cost of a repair up or down.
Frequently Asked Questions About Surviving a Texas Heat Wave Without AC
How long can a house safely stay hot before it becomes dangerous?
There’s no fixed number, but once indoor temperatures pass the high 80s and keep climbing, the risk rises quickly for infants, older adults, and anyone with a heart or lung condition. If the temperature is still rising after dark with no plan to cool it, treat that as a reason to call for help rather than wait it out.
Should I turn off my AC unit if I smell burning or see sparks?
Yes. Shut the system off at the thermostat and, if you can safely reach it, at the breaker, then call for emergency service. A burning smell or visible sparking is an electrical warning sign, and running the unit longer risks a bigger failure or a fire hazard.
Is it safe to run a portable generator to power a window unit during an outage?
Only if the generator is running outdoors, well away from doors and windows, and never inside a garage, even with the door open. Carbon monoxide from a generator is invisible and can build up fast in an enclosed space, so this is not a place to cut corners.
Will ceiling fans actually cool the air, or do they just move it around?
Ceiling and box fans don’t lower the room’s actual temperature; they cool your body by speeding up sweat evaporation. That’s why fans help most when you’re in the room with them running and do very little for an empty house.
What should renters do if a landlord is slow to fix a broken AC during a heat wave?
Document the outage in writing with dates and indoor temperatures, and follow up promptly since many local ordinances treat working AC as a habitability issue in extreme heat. In the meantime, use the cooling steps above and check on any household members who are especially heat-sensitive.
Can pets safely stay in a house with no air conditioning in the Texas summer?
For a few hours, yes, if they have water, shade, and access to the coolest room in the house. If the outage stretches overnight or the house is climbing past the mid-80s, move pets somewhere cooler, since they can’t cool themselves as effectively as people can.
Does emergency AC repair cost more at night or on weekends?
After-hours and weekend rates are often higher than a standard daytime appointment across the HVAC industry, since it takes a technician away from home on short notice. Ask for a quote when you call so you know what to expect before anyone comes out.
A hot house is uncomfortable. A hot house with no plan and no help on the way is a risk you don’t need to take. If your AC has stopped working and the temporary fixes above aren’t keeping up, reach out to CityLine Air Conditioning for emergency AC repair across the DFW service areas we cover.