Common AC Issues: Blowing Warm Air
Brad Gordon • February 5, 2024

After completing your weekend yard work, you head inside to find some relief from the sweltering Florida heat. You expect your air conditioner to blow refreshingly cold air and help you wind down, but it’s instead blowing warm air, creating an awfully uncomfortable atmosphere in your home! 



Every summer, residents throughout Florida face that exact problem, but the good news is that you don’t have to diagnose the problem alone; turn to an AC repair company in Longwood, FL, to determine what’s behind the issue and fix it.

Common Reasons Your AC Is Blowing Warm Air

Many factors impact your air conditioner's efficiency, each with signs that can alert you to a problem:

Wrong Thermostat Settings

Sometimes, your AC may be blowing warm air because of simple human error; you may think you have the system set to “cool,” but the thermostat is instead set to “warm” or “fan.” It’s an easy problem to resolve, and you can typically do so without the help of a professional.



Look at your thermostat to see what setting it’s on, and remember that the temperature setting must be low enough to make a difference. If that doesn’t fix your issue, you may need to swap out the batteries, and if that doesn’t work either, then it may be best to call in the pros to have a look.

Dirty Air Filters

Air filters stop debris and particles from moving through your AC unit, but those same materials cause them to become dirty and clogged, reducing airflow through your system and resulting in warm air circulating through your home. 



A technician from an AC repair company in Longwood, FL, can replace the filter to solve the problem. It’s recommended to replace the old one every one to three months, but always follow the manufacturers' recommendations for your specific brand and model.

Low Refrigerant Levels

Refrigerant is a necessary component for any AC to run correctly; it helps generate the cold air that moves through your home by absorbing humidity and heat from the air outside, leaving you with cool and calming relief.


Running low on refrigerant, though, is a problem that cannot be resolved without the help of an AC repair company in Longwood, FL, as there are many potential causes behind it, such as a leak, recharging the refrigerant, or a more significant problem within the unit itself

Friendly AC Repair Company in Longwood, FL

If your AC is blowing warm air or you’re experiencing any other AC issues, Astoria Heating & Cooling can help. Contact us today to schedule your appointment with a friendly, local, and trustworthy HVAC company.

Woman adjusting thermostat on a wall with temperature controls for a home HVAC system.
By Brad Gordon June 9, 2025
Is your AC underperforming? The issue might be your thermostat. Learn common thermostat problems and when to call your trusted Longwood HVAC company.
Air conditioner units for proper sizing in a residential backyard.
By Brad Gordon May 12, 2025
The wrong AC size can raise bills and reduce comfort. Learn why proper sizing matters and how a Longwood HVAC company ensures the right fit for your home.
Astoria HVAC technician inspecting air conditioner for potential replacement options in Oviedo.
By Brad Gordon April 21, 2025
Considering AC replacement in Oviedo? Learn what to look for in a new system—BTUs, SEER ratings, and expert installation. Free estimates from Astoria HVAC.
Professional HVAC contractor servicing an air conditioning unit in Longwood.
By Brad Gordon March 15, 2025
Hiring a licensed and insured Longwood HVAC contractor ensures quality, safety, and code compliance. Avoid risks and trust the experts at Astoria Heating & Cooling.
A woman relaxing in a bright, clean home, enjoying fresh indoor air.
By Brad Gordon February 26, 2025
Breathe easier with better indoor air quality! Learn how air purifiers improve sleep, respiratory health, and skin. Contact Astoria Heating & Cooling for solutions today!
An HVAC technician inspecting an outdoor AC unit during a winter tune-up in Longwood.
By Brad Gordon January 17, 2025
Don’t wait for summer! Learn why January is the perfect time to schedule your AC tune-up with Longwood’s trusted HVAC technicians. Beat the spring rush and stay cool.
Show More