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AC Blowing Warm Air

AC Blowing Warm Air

Scheduling AC Repair in the Winter – Why it’s Wise

Although cooler temperatures mean you probably won’t use your air conditioner, when the AC is blowing warm there is good reason to go ahead and schedule a repair with a Cypress Heating and Air Conditioning HVAC technician.  First, if your AC happens to be a package heat pump and the unit is not functioning properly, the heating function is likely to also be experiencing problems. A heat pump utilizes the same components to produce both heating and air conditioning. A component called a reversing value reverses the flow of the refrigerant gas to change between the AC and heat. Therefore, if the AC is not properly working, neither will the heat, and vice versa.

Next, if your AC is separate from the heating system, you still need to schedule repairs now, and not next spring. For example, when the AC is blowing warm air, it may be due to a refrigerant leak, one of the most common causes. If the unit is low on refrigerant and you wait until next spring for repair, it is also highly possible the compressor will require replacement by spring. The compressor is the component of the system with the highest cost. In fact, most homeowner’s will buy a whole new system rather than replace the compressor.

There are additional reasons that may be behind an AC blowing warm air, and some are issues you can take care of yourself.  The following information can assist you in determining the cause, and may provide a quick fix without the need to call your technician. However, if the AC is blowing warm air after checking the following, contact Cypress Heating and Air Conditioning to schedule repair.

Check the Thermostat Setting

It isn’t uncommon for homeowner’s to turn the fan on manual. A burned meal, a smoking fireplace, and using the fan to pull in fresh, clean air through a window or door are all common practices. The problem occurs when we forget to return the fan to the automatic function. The fan will run continuously, even when the AC compressor doesn’t cut on. This can give the appearance of the AC blowing warm air. Check the thermostat to ensure the fan is on the automatic setting, and the setting is on cool.

Check the Breaker

Occasionally, the breaker or breakers controlling the HVAC system can trip, and may allow the fan to run while the compressor doesn’t. Ensure the breaker is “ON”.  Typically, on a package heat pump there will be a breaker controlling it, and potentially one controlling the heat strips if present. In this situation, when the AC is blowing warm air, the breaker shouldn’t be tripped. However, if the heat pump is a split system, there can be 2 to 3 breakers controlling the system. One breaker is for the outdoor component containing the compressor, one for the indoor component which contains the blower fan, and one for heat strips if present. The outdoor component can experience a thrown breaker, while the breaker for the indoor blower unit can continue to operate, resulting in the AC blowing warm air, because the compressor will not be operating. If you are uncertain, turn the breaker(s) off and back on again. Check for operation by lowering the thermostat.

If the breaker was “off”, and pushing it back to on causes it to trip again, there is likely a problem with either the air conditioner or the breaker. Contact Cypress Heating and Air Conditioning AC repair in Katy. Breakers are a common cause of the AC blowing warm air, and the system may have internal breakers in addition to those in the electrical panel. Contact our NATE certified technicians for AC repair in Katy.  Power surges are a possible cause for a tripped breaker, as long as the surge wasn’t powerful enough to damage the HVAC system, resetting the breaker can potentially take care of the problem.

The Dirty Filter

Check the filter and replace if dirty. A dirty filter will also soil the system and ducts, and can cause damage to components.

Dirty Condenser Coil

Ensure the area around the exterior unit is free of vegetation and clear of debris to provide adequate airflow. If the condenser coil is in need of cleaning, contact a Cypress technician for service.

Dirty Evaporator Coil

In a split system, the interior portion of the system contains the fan blower and the evaporator coil. The air filter is located in this area, and helps to protect the evaporator coil from damaging debris and soiling. The coil will eventually require cleaning, although the routine changing of the air filter will reduce the frequency. A dirty coil can cause reduced performance, and the AC blowing warm air.

Refrigerant Leak

A refrigerant leak is a top cause of the AC blowing warm air. The repair of a leak can only be provided by a qualified HVAC technician. The signs of low refrigerant can include:

  • The refrigerant line is frosted over
  • The sound of bubbling or a hissing noise
  • The AC blowing warm air

The AC is a closed system and as long as there is not a leak, additional refrigerant is not required. A refrigerant leak can lead to costly damage to the system. Schedule an AC repair in Katy right away.

Cypress Heating and Air Conditioning NATE certified technicians have the expertise to provide a wide range of reliable HVAC services. If your AC is blowing warm air, give us a call. We serve Katy, Plano and the surrounding areas, and are a member of the BBB with an A+ rating.