It’s never convenient when your air conditioning system stops working. It’s even worse when the weather is hot and humid. Air conditioner repair is costly, especially if you have to wait for the technician to come out. However, a little troubleshooting can often help you avoid an emergency repair call and keep your house cool while you wait for the technician.
The first thing to check is that your thermostat is set to AC mode and the circuit breaker isn’t tripped. It’s also a good idea to make sure the air filter is clean, and that the fan motor is running. If all of that is in order, but the fan isn’t running and you hear the humming sound from the condenser coil, turn the unit off or to “fan only” mode and allow it to thaw for 24 hours. Then, replace the air filter and try turning the system back on. If you are unable to cool your home after that, contact a professional.
Frozen evaporator coil: The constant operation of the system at night, low refrigerant levels, and poor circulation can cause the evaporator coil to freeze up. This makes the air coming out of your supply registers feel warm, but the fix is simple. Turn off the system and allow the evaporator coil to thaw. Then change the air filter and reseal the ductwork around the unit to prevent the coil from freezing in the future.
Dirty air filter: Dirty filters block the flow of air, causing the system to work harder to circulate cold air. The aluminum fins on the evaporator and condenser coils can also become bent, blocking the airflow. Air conditioning wholesalers sell a tool called a fin comb, which will straighten the coil’s fins, improving airflow.
High energy bills: The extra work your system must do to cool your house in summer causes it to use more electricity, which shows up on your utility bill. If you notice a significant increase in your bill, it’s a good idea to inspect the system for signs of problems.
An aging system: The average air conditioner lasts about 15 years, but it can last much longer with regular maintenance. If you’re planning to sell your home soon, it might be worth the investment of replacing an older system to get a higher sale price.
If you’re a homeowner, the best way to minimize AC repair costs is to have a professional tune up twice a year. A trained technician can check the system for things that homeowners can’t do on their own, such as checking refrigerant levels and cleaning ductwork. This maintenance will ensure that your system is working properly and efficiently, extending its lifespan. This is also a great time to replace the air filters, which should be replaced at least once per season. If you have a window unit, the seals around it should be checked periodically to ensure that they are tight and free of cracks or gaps.