The main reasons why a central air conditioner might not be blowing cold air include:
- Thermostat settings being incorrect, such as the fan set to "on" instead of "auto" or the temperature not set low enough.
- Low refrigerant levels due to leaks, which impair cooling efficiency.
- Dirty or clogged air filters that reduce airflow.
- Frozen evaporator coils or dirty condenser coils.
- Blocked or clogged outdoor AC unit or ducts causing poor airflow.
- Malfunctioning compressor or thermostat.
Common initial steps to troubleshoot include checking thermostat settings, replacing batteries, changing or cleaning air filters, inspecting the outdoor unit for debris, and ensuring vents are open. If issues like refrigerant leaks or compressor problems are suspected, it is best to call an HVAC professional for repair and servicing.
