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Why Your AC Turns Off and On Too Often

Short cycling warns of a system fault. Learn what causes rapid on and off cycles.

Short cycling raises energy use and speeds up system wear in homes in Philadelphia, PA. The pattern also signals a fault. You need to find the source and correct it.

Small refrigerant leak
Low refrigerant lowers coil temperature. The system trips off. When pressure rises, it restarts.

Dirty coil
The system overheats from restricted airflow.

Faulty thermostat placement
Thermostats near windows or supply vents read the wrong temperature and turn the system off early.

Oversized system
The unit cools too quickly and shuts down. Humidity stays high. This is common in older homes in Philadelphia, PA.

Actions
• Replace the filter
• Clear supply vents
• Ask Air Pro HVAC to test refrigerant levels
• Request a coil cleaning
• Confirm thermostat location

Short cycling reduces lifespan. Call Air Pro HVAC at (215) 240-8466 when you see repeated on and off cycles.

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How to reduce indoor humidity?

Aim for 40–50% RH. Run exhaust fans, seal air leaks, and keep filters clean for steady moisture removal. Use ‘auto’ fan so coils stay cold and dehumidify properly. If air stays clammy, add a whole‑home dehumidifier or right‑size the system to stop short cycling.

Disclaimer: This information is provided for general guidance only and should not replace advice from a licensed HVAC professional. Signs like rooms cooling quickly yet feeling clammy or an AC that short‑cycles may indicate an oversized system. A qualified technician can perform a Manual J load calculation — the recognized standard for determining a home’s precise heating and cooling needs.Always consult a pro before making decisions about system sizing or installation.