After you enjoy outdoor summer activities (like barbecues and hikes), you need a comfortable indoor space to cool off. This is where an air conditioner comes in. However, your AC can malfunction and begin to blow warm air. 

Here are the most likely reasons why your AC is blowing warm air. 

Clogged Filter

A clean air filter is vital for your air conditioner to work correctly. Your AC's air filter traps particles and contaminants that try to force their way into your home. This crucial component ensures that your AC only delivers clean and safe air to your home.

If debris and dirt build up in the air filter, air will not enter your system easily. As a result, your AC strains to cool your home and overheats. As a result, your AC only blows warm air into your indoor space.

Ideally, you should change the air filters every 1-3 months for your system to work efficiently. However, if you have pets, people who have allergies, or smokers in your home, you should replace the air filter more often to avoid compromising the air quality in your home. 

Refrigerant Leaks

The refrigerant (coolant) absorbs heat from the air in your home. If refrigerant leaks due to loose joints, a worn service valve, or poor assembly, the refrigerant levels reduce, and your AC loses its cooling power. Consequently, the air in your home will feel warmer than usual. 

One clear sign of low refrigerant levels is long cooling cycles. Other symptoms include: 

• Higher utility bills
• Frozen evaporator coils
• Hissing or bubbling sounds

You should never attempt DIY fixes because AC refrigerant is a dangerous substance. Instead, contact a professional to eliminate the leak and add refrigerant into the evaporator coils. If your AC still blows warm air after a refrigerant recharge, a technician can help you establish the underlying reason.

Electrical Issues

Your AC will blow warm air if the indoor unit is working, but the outdoor condensing unit has already failed. Power loss to the outdoor unit can happen if your AC draws too much power and overloads the circuit, which results in a tripped circuit breaker.

To fix this issue, simply locate the tripped breaker in your electric panel and reset the breaker. If your AC keeps causing the circuit breaker to trip, your unit likely has other electrical issues. You should bring a technician to diagnose and restore your AC system. 

If your system blows warm air, a professional can fix it before it breaks down. But ensure that you schedule regular maintenance appointments to catch serious issues on time so you can enjoy a trouble-free summer.

Contact an HVAC contractor to learn more.