Thermostats are the control center of your air conditioning system. If your AC isn't working, the first place to check is the thermostat.

Make sure your thermostat is set to "cool" and not just "fan". Double-check the temperature setting to ensure it's lower than the current room temperature.

Sometimes, the problem is as simple as a power supply issue. AC units require a steady and reliable power source to function.

Check your home's electrical panel for blown fuses or tripped breakers. Resetting a breaker might be all it takes to get your AC running again.

Refrigerant is essential for AC systems since it absorbs and expels heat. A refrigerant leak can significantly impact your AC's performance.

• Listen for unusual hissing or bubbling noises which could indicate a refrigerant leak.
• Check the evaporator coil; if you notice ice build-up, it's a strong sign of a refrigerant issue.