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Why Your AC Smells When It Starts

AC odors signal a problem. Learn what causes common smells at startup.

Odors from your AC point to moisture problems or electrical faults. Homes in Philadelphia, PA experience this during long cooling seasons. The smell is a sign of contamination or overheating.

Musty smell
Moisture sits on the coil or in the drain pan. Dust mixes with moisture and produces odor.

Burning smell
Dust sits on electrical parts during long idle periods. When the system starts the dust burns away.

Actions
• Replace the filter
• Request a coil cleaning from Air Pro HVAC
• Ask for a blower compartment inspection
• Have Air Pro HVAC test electrical connections

Odors do not improve without service. Call Air Pro HVAC at (215) 240-8466 to schedule a cleaning and safety inspection.

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Side discharge ac: what should I know?

Start with easy wins: clean filter, clear the drain, and confirm thermostat mode and batteries. Keep outdoor coils clear and allow 2–3 feet of space for airflow. If comfort lags, ducts or refrigerant may be the culprit—time to call a pro.

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.