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AC Repair: Blowing Hot Air

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An air conditioning system is designed to provide cool and comfortable air, so when it starts blowing hot air instead, it can be frustrating and uncomfortable, especially during the hot summer months.

Here are some common causes of an air conditioner blowing hot air and troubleshooting tips to help you diagnose and potentially resolve the issue.

Common Causes and Solutions

Several factors can contribute to this issue, ranging from minor problems to more significant AC malfunctions.

  • Thermostat Settings: start by checking the thermostat settings. Ensure that the thermostat is set to the cooling mode and that the temperature is set lower than the current room temperature. Sometimes, the thermostat may accidentally switch to the heating mode or have incorrect temperature settings, causing the air conditioner to blow hot air.
  • Dirty Air Filter: a dirty or clogged air filter can restrict airflow and cause the AC unit to struggle to cool the air properly. Check the air filter and clean or replace it if necessary.
  • Refrigerant Leak: low refrigerant levels due to a refrigerant leak can result in the air conditioner blowing hot air. Refrigerant is responsible for absorbing heat from the air, and if there is a leak, the AC system won't be able to cool the air effectively.
  • Condenser Issues: the condenser unit, located outside the house, plays a crucial role in cooling the air. If the condenser is dirty or blocked by debris, it can restrict airflow and affect the cooling process. Check the condenser unit and clean it if necessary.
  • Electrical Problems: electrical issues, such as a tripped circuit breaker or a blown fuse, can disrupt the power supply to the air conditioner, causing it to blow hot air. Check the electrical panel and reset any tripped breakers or replace blown fuses.
  • Compressor Problems: the compressor is a vital component of the air conditioning system that compresses the refrigerant to facilitate the cooling process. If the compressor is malfunctioning or not functioning at all, it can result in the AC blowing hot air. Compressor issues are typically complex and require professional attention to diagnose and repair.
  • Ductwork Leaks: Leaky ductwork can allow hot air from the attic or crawl spaces to mix with the cool air, resulting in the AC blowing hot air. Inspect the ductwork for any visible leaks or disconnected sections. Sealing ductwork leaks can improve cooling efficiency and prevent the escape of cooled air.

When your air conditioner starts blowing hot air, it's important to identify and address the underlying issue promptly. Start by checking the thermostat settings and ensuring a clean air filter.

If the problem persists, consider refrigerant levels, condenser cleanliness, electrical connections, compressor functionality, and ductwork leaks. In many cases, it may be necessary to consult a professional HVAC technician for a thorough inspection and AC repair. For more information on cooling repair, contact a professional near you.