New Jersey homeowner guide

Why Is My AC Not Cooling?

Common reasons a central air conditioner may stop cooling properly and when to request HVAC service.

Updated 2026-08-27 • Educational content

When an air conditioner runs but the home stays warm, possible causes include thermostat settings, restricted airflow, indoor or outdoor equipment problems, electrical issues or refrigeration-system faults. Homeowners can check simple items such as the thermostat and filter, but equipment diagnosis should be left to trained service personnel.

What you can observe safely

  • Note exactly when the problem happens and whether it is constant or intermittent.
  • Write down the brand and model number if it is easy to access safely.
  • Take a photo of visible leaks, error codes or control displays when appropriate.
  • Avoid disassembly, live electrical work, gas work or anything that creates a safety risk.

When to stop using the equipment

Stop use and request qualified help when there is active leaking near electrical equipment, a burning smell, smoke, repeated breaker trips, suspected gas odor, flooding, sewage backup or another condition that may create property damage or a safety hazard.

Request service in New Jersey

Broad Home Services serves customers throughout New Jersey. Send your city or ZIP code, the symptoms, and the brand/model when available.

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Tell us the problem and your New Jersey ZIP code.

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