Your AC is running but blowing warm air — one of the most frustrating things that can happen on a Pearland summer day. Before calling a technician, work through these checks. Some causes you can fix in 10 minutes. Others need professional service.
It sounds obvious, but check that your thermostat is set to "Cool" and not "Fan Only" or "Heat." Also verify the setpoint is actually below the current room temperature — if it's 74°F in the house and the thermostat is set to 76°F, the system won't run. While you're there, try replacing the thermostat batteries. A low-battery thermostat can behave erratically and cause it to misread the room temperature.
Pull out your air filter and hold it up to a light. If you can't see light through it, it's overdue for replacement. A severely clogged filter restricts airflow to the point where the system can't move enough air across the coil to cool effectively — and can cause the coil to freeze over, which paradoxically results in warm air coming from your vents. Replace the filter with a fresh one and give the system 30 minutes to see if cooling improves.
Go outside and look at your condenser unit. Is it running? If the outdoor unit isn't spinning, the compressor isn't working — and you'll get warm air regardless of what the air handler is doing. Check the outdoor disconnect (a small box on the wall near the unit) to see if it's been tripped. Also look for obvious debris blockage on the condenser coils — in Pearland's landscape-heavy environment, grass clippings and leaves can pack the coils and severely reduce efficiency.
Open your air handler access panel (or look at the refrigerant lines going into the unit). If you see ice, your evaporator coil is frozen — a sign of either airflow restriction or low refrigerant. See our frozen AC guide for what to do next. Don't keep running the system with ice on the coil.
If you've checked all of the above and your AC is still blowing warm, the likely culprits are: low refrigerant (requires a certified tech), a failing compressor, a bad capacitor on the outdoor unit, or a refrigerant metering device issue. These aren't DIY fixes. Pearland HVAC Repair provides same-day service — call (281) 819-0274 and we'll have someone out today.
Pearland HVAC Repair — serving Pearland, TX and surrounding areas.
Call (281) 819-0274If your AC blows cold during the day but warm at night, the most common cause is the outdoor coil overheating during peak afternoon heat and the compressor going into thermal protection cutoff. This often indicates a dirty condenser coil or low refrigerant. Have a technician check refrigerant levels and clean the coil.
Refrigerant recharge in Pearland typically costs $150–$400 depending on the type of refrigerant and how much is needed. However, simply recharging without finding and fixing the leak is a temporary fix — the refrigerant will leak out again. A proper repair includes leak detection and repair.
No — handling refrigerants requires EPA Section 608 certification. Purchasing and handling refrigerant without this certification is illegal under federal law. Home AC units use different refrigerant than car AC recharge kits. Call Pearland HVAC Repair at (281) 819-0274 for a proper refrigerant service.