Why is my AC not cooling my house?

Your AC may not be cooling due to several common issues, ranging from simple fixes like a dirty filter to more complex problems requiring professional repair. The most frequent culprits are restricted airflow, refrigerant issues, or thermostat problems.

Start with the basics first. Check your air filter - a clogged filter is the #1 cause of cooling problems and can reduce efficiency by 15-20%. Replace it if it's dirty or hasn't been changed in over 3 months. Next, ensure your thermostat is set to "cool" mode and the temperature is set lower than the current room temperature. Check that all vents throughout your home are open and unblocked by furniture or curtains.

If those basics don't solve the problem, you're likely dealing with a mechanical issue. Low refrigerant levels from a leak can prevent proper cooling - you might notice ice forming on the outdoor unit or copper lines. A failing compressor, dirty evaporator coils, or electrical problems can also cause poor cooling performance. In Ottawa's climate, outdoor units can get clogged with cottonwood seeds, leaves, or debris, restricting airflow to the condenser.

Don't ignore safety signs - if you smell burning, hear grinding noises, or see sparks, turn off the system immediately. AC repairs in Ottawa typically range from $200-$700 depending on the issue, while a full system replacement runs $3,500-$5,500 for most homes.

Turn off your AC and call a licensed technician if basic troubleshooting doesn't restore cooling. Continuing to run a malfunctioning system can lead to more expensive damage, especially to the compressor. For reliable AC repair and a free diagnostic, Ottawa HVAC Pro can quickly identify and fix the problem to restore your home's comfort.

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