What should I do if my AC is blowing warm air intermittently?

Intermittent warm air usually means a thermostat issue, airflow restriction, or dirty outdoor coils. Do a few quick checks before calling.

• Set thermostat to Cool and a lower temperature.
• Replace/clean the air filter to restore airflow.
• Open supply vents and remove blockages.
• Clear leaves/debris around the outdoor unit and gently clean coils.
• Power the system off for 5 minutes, then test again.

Parrish Services provides 24/7 emergency diagnostics and AC repairs, including airflow and thermostat fixes, in Reston and across Northern Virginia. <br/> Updated: 2025-12-31 <br/> Need help in Reston, VA? Call (571)-650-1016 or book online.