If your air conditioner is freezing up, the first thing you should do is turn it off. If you continue to run it, the compressor could be damaged.
Check the following items:
Thermostat temperature setting. If your thermostat is set below 70 degrees it could be causing your air conditioner to freeze up — and it’s actually not cooling your home any faster.
Refrigerant level. If your refrigerant level is low, this could signal a larger issue and we’d recommend calling a professional to have a look.
Air filter. A clogged, dirty air filter could be causing the issue. As mentioned above, change the filter if it’s been more than a month since the last change.
Vents. Make sure all vents are open to ensure air flow to the evaporator coil.