Derek Cole walks through why your AC might not be working. Start with the easiest fixes: check that your thermostat is set to cool mode and swap out a clogged air filter. If that doesn't work, call an HVAC technician.
Chapters
It could be a few different things. A faulty thermostat, low refrigerant, could be a clogged air filter. It could be a clogged drain line. The simplest thing for you to check is the thermostat and the air filter. Maybe you're in between seasons, you haven't changed it over to heat from cool, or you haven't changed it from cool to heat. So make sure your mode on the thermostat is set to the right temperature you want. And then also check your air filter, make sure it's not clogged, make sure it's changed out on a regular basis. Check that first. If beyond that you're having trouble, You probably need to call a professional.