My AC Isn’t Working
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What Should I Check First?
If your air conditioner is not turning on or cooling properly, try these quick troubleshooting steps before scheduling AC repair.
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Check the Thermostat
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Make sure the thermostat is set to “Cool”
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Lower the temperature setting a few degrees below room temperature
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Replace thermostat batteries if needed
Reset the AC Breaker
A tripped breaker can stop your system from running. Check your electrical panel and reset the AC breaker if needed.
Check the Outdoor AC Disconnect
Locate the disconnect box near your outdoor AC unit and make sure it is in the “On” position.
Replace Dirty Air Filters
Clogged air filters can restrict airflow and reduce cooling performance. Check and replace filters regularly to improve airflow and system efficiency.
Wait a Few Minutes
Some systems have built-in delays and may take several minutes to restart after resetting power.
What If the Thermostat Is Blank?
If your thermostat screen is blank:
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Check the HVAC breaker
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Verify the furnace or air handler switch is turned on
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Inspect the drain pan for standing water
Water in the drain pan may trigger a safety shutoff. Removing water temporarily may restore power, but professional service is recommended to address the root issue.
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My AC Is Running But Not Cooling
If your air conditioner is on but your home is still warm:
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Check and replace dirty air filters
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Make sure all vents are open and unobstructed
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Inspect the outdoor unit for debris blocking airflow
Restricted airflow is one of the most common causes of poor cooling performance.
My Heat Isn’t Working
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What Should I Check?
If your furnace or heating system is not working properly, try these basic troubleshooting steps.
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Check the Thermostat
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Make sure the thermostat is set to “Heat”
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Raise the temperature setting above room temperature
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Reset the Breaker
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A tripped breaker may prevent your heating system from operating.
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Verify the Gas Supply
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For gas furnaces:
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Ensure the gas valve is turned on
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The valve should be parallel with the gas pipe
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Allow Time for Startup
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Some heating systems have a delay before starting. Wait 5–10 minutes after adjusting the thermostat.​
Prevent HVAC Problems with Routine Maintenance
Many heating and cooling issues can be prevented with regular maintenance. Seasonal HVAC tune-ups help:
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Improve system efficiency
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Reduce breakdowns
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Extend equipment lifespan
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Lower energy bills
ASAP Heating, Air & Plumbing offers HVAC maintenance plans in Tulsa and Oklahoma City to help keep your system running efficiently year-round.
When to Call a Professional HVAC Technician
If your system is still not working after completing these troubleshooting steps, it may be time for professional service.
Contact ASAP Heating, Air & Plumbing for:
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AC repair in Tulsa and Oklahoma City
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Furnace and heating repair
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HVAC inspections and diagnostics
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Emergency HVAC service
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Preventative maintenance and tune-ups
Our experienced technicians service all major HVAC brands and provide fast, reliable solutions for homeowners throughout Tulsa and Oklahoma City.
