Why Does My HVAC System Stop Blowing Cold Air When It’s Hot?


AC Installation is completed in many homes in Fontana to provide comfort in the harsh summer months. They keep rooms at a pleasant temperature. It can be frustrating when your AC system breaks down and stops blowing cool air.

There can be several reasons your AC system is not blowing cool air. You should find the fault causing the AC system to malfunction to fix the problem permanently.

The Most Common Reasons Why Your Air Conditioner Isn't Cooling Your Home.

Although it can be a concern that the air conditioner is blowing warm air rather than cold, many reasons for this can be easily fixed.

  • Thermostat Problems

If you’re concerned about the office or home air conditioner blowing warm air, the thermostat is the first to look at. They are often changed due to others in the household or business changing the temperature.

Check that your thermostat has been set at COOL and the fan is set to AUTO. It is also important to ensure that the temperature set is less than the outdoor air temperature. Replace the batteries if it has been ages since you last replaced them.

  • Dirty Air Filter

A dirty or blocked air filter can impede airflow and must be maintained. While the air conditioning is turned on, the filter collects dust, pollen, hair, lint, and other air particles to keep the rest of the air conditioning system running smoothly. Our AC installation in Fontana expert advise that if the air filter gets blocked, the air conditioner is under stress and may cause the air cooling system to stop blowing cold air.

If your system’s air filter is clogged or dirty, the airflow is limited through your home, which leads to the AC being unable to blow cold air. If there isn’t enough airflow, the system could shut down. Ensure to wash your filters frequently or replace them every three months to avoid sudden breakdowns and expensive repairs.

  • Evaporator Coil Issue

Like the condenser unit and an air filter, the evaporator could fail or become clogged with particles. When dirt accumulates around the evaporator’s coil, the cold air can cause condensation to freeze, resulting in a frozen coil.

It leads to an air conditioner blowing warm air instead of cold air. The evaporator coil could need replacement if it is damaged, which is done by our expert AC Replacement technician in Fontana, CA. The AC blowing warm air can increase the humidity in the home, coupled with high summer temperatures, it can be hazardous if felt unresolved.

Bottom Line

If you’ve tried checking your thermostat, changing your filter, and resetting your breaker but have had no luck, call our HVAC specialist to have your AC diagnosed professionally and promptly fixed.

If you attempt to fix yourself it can be dangerous; air conditioners are full of moving parts and dangerous chemicals, and you could be causing more harm to your AC system or yourself. Schedule an appointment for your AC repair with 4 Points AC and Heating. Call 909-970-4440 to schedule an appointment with AC Replacement experts in Fontana, CA, today for all your cooling needs