My AC has always worked fine. A couple months ago I replaced a battery powered thermostat with a Honeywell Wifi smart thermostat. The new thermostat needed a "C" wire for power and there was an unused dark blue wire behind the old thermostat so i connected it to the "C" port at the furnace...

Right before my unit stopped cooling I had the temp on a normal setting I always have it on. All of a sudden it got really freezing, ice cold, in the house. I turned the system completely off, when I needed it to cool again and tried to turn it on- the outside unit, blower, fan, everything...