Why is my AC not cooling my house properly

Your AC may not be cooling properly due to several common issues, with a dirty air filter and low refrigerant being the most frequent culprits. Start by checking your air filter - a clogged filter restricts airflow and forces your system to work much harder while delivering less cooling.

Airflow problems are often the easiest to fix yourself. Beyond the filter, check that all vents are open and unblocked by furniture or curtains. Your outdoor unit also needs proper airflow - clear away any leaves, grass clippings, or debris around the condenser unit, and ensure there's at least 2 feet of clearance on all sides.

Refrigerant issues require professional attention and are common in Ottawa's climate. Low refrigerant levels, often due to small leaks, will cause your AC to run constantly without reaching the set temperature. You might notice ice forming on the indoor coil or copper lines. Only licensed technicians can safely handle refrigerant, and in Ontario, this work must be done by certified professionals.

Other potential causes include a failing compressor, dirty evaporator coils, or an oversized/undersized system for your home. In Ottawa's hot, humid summers, even a properly functioning AC can struggle if it's undersized for your square footage or if your home has poor insulation.

Check your thermostat settings first - ensure it's set to "cool" and the temperature is set lower than the current room temperature. If the fan setting is on "auto," try switching it to "on" temporarily to see if that improves air circulation.

If these basic checks don't solve the problem, it's time for professional diagnosis. AC repairs in Ottawa typically range from $200-$700 depending on the issue, while refrigerant recharges cost $200-$400. For a thorough system inspection and repair estimate, consider having a licensed HVAC technician evaluate your system before the problem worsens in Ottawa's peak summer heat.

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