Is Your AC Not Blowing Cold Air? 4 Causes

Posted on: 8 July 2022


It can be an uncomfortable experience when your AC does not blow cold air from the vents. Not only will your home's interior be unbearable, but it will also cause your utility bills to spike. Therefore, you must schedule an appointment with an AC professional to conduct a diagnostic, establish the root cause, and make repairs or replacements for optimal cooling power. The following are some of the causes why your AC is not blowing cold air. 

Refrigerant Leak

The refrigerant facilitates heat transfer by absorbing heat as air passes through the evaporator coils and expelling it outdoors in the condenser unit. The refrigerant circulates seamlessly in a closed-loop system and hence does not deplete with usage. Therefore, if the lines carrying the refrigerant spring a leak, the refrigerant levels will decrease, impeding heat absorption. This results in your AC's reduced cooling power, thereby inadequately cooling your home. Hire an HVAC repair expert so they can patch the leaks and recharge the refrigerant for a peak cooling output.

Undersized AC Unit

If your AC is too small for your needs, it will run for longer periods and struggle to sufficiently cool your home. In addition to failing to cool your space, an undersized AC will short-cycle, accumulating more wear and tear as the system shuts on and off repeatedly. Therefore, you must consult an experienced AC technician to help purchase the right size unit for your home. They will calculate the square footage of your house, the number of windows and occupants, and the structure's insulation to determine the cooling output of your AC.

Blocked Registers

Supply vents distribute cold air throughout your home from the air handler. If dirt and dust accumulate in the air passages, they will restrict the airflow, causing warm air to be prevalent in your home. This is because pressure imbalances can cause holes and cracks in the ductwork, resulting in dirt and dust drawing into the ducts and depositing around the vents. You must engage an HVAC contractor to seal any leaks in the ductwork and clean the vents for an adequate cold air supply.

Damaged Compressor

A compressor moves the cold, low-pressure coolant from the evaporator coils, raising its temperature and transferring it to the outside air. Therefore, if your compressor malfunctions, the refrigerant temperature will remain constant, impeding heat transfer. Not only will an AC technician repair your compressor, but they will also service your system for any signs of deterioration and remedy them promptly.

If your AC is not blowing cold air as it should, you should engage an HVAC professional for repair service. They will examine your unit and fix the underlying issues to maximize the cooling power for a more comfortable experience. 

Contact a local HVAC service to learn more about air conditioning repair.