It’s July in Pennsylvania, the heat index is climbing, and suddenly your AC is blowing warm air. If that’s you, you’re not alone—this is one of the most-Googled HVAC issues for homeowners in summer 2025.
At ECI Comfort, we help homeowners throughout Bucks County, Montgomery County, and Philadelphia stay cool and comfortable. Here’s how to troubleshoot the issue and know when it’s time to call in the pros (us).
6 Reasons Your AC Might Be Blowing Warm Air
1. Your thermostat settings are off
Double-check your thermostat:
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Set to “Cool”, not “Fan” or “Heat”
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Target temp is lower than the room temp
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Fan mode is set to “Auto”, not “On”
Easy Fix: Adjust settings or replace batteries if needed.
2. Clogged or dirty air filter
A dirty filter restricts airflow, which can cause overheating—or even frozen coils.
Tip: Replace your filter every 1–2 months, especially in summer.
3. Low refrigerant or a leak
If your system is low on refrigerant, it can’t remove heat properly—so you’ll feel warm air. Call a professional for this task!
4. Dirty or blocked outdoor unit
The outdoor condenser coil releases heat. If it’s dirty or blocked, your system won’t cool effectively.
Quick Fix: Rinse coils with a garden hose (power off first) and keep the area around it clear.
5. Blown fuse or electrical issue
Your indoor blower may be working—but if the compressor isn’t, you’ll only feel room-temperature air.
Pro Help Needed: Don’t DIY electrical repairs. Call an expert.
6. Leaky ductwork
If you have central AC and the ducts are leaking, cooled air might be escaping into the attic or walls.
What To Do Next
If your AC is still blowing warm air:
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Change the filter
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Reset the thermostat
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Check the outdoor unit
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Then call ECI for a professional diagnosis
The best way to prevent issues like this is with seasonal HVAC maintenance. Our technicians check:
Expert AC Repair & Maintenance from ECI Comfort
We’ve been keeping homeowners cool in Philadelphia, Bucks County, and the Delaware Valley for over 30 years. Whether you need fast AC repairs, a tune-up, installation or any energy efficient upgrades, we've got you covered! Schedule your AC checkup today and stay cool all summer long!
If you live in the Delaware Valley/Greater Philadelphia area and would like to find comfort within your home, visit our website or give us a call at 215 - 245 - 3200 to learn more.
