what happens if your air conditioning unit runs out of freon
Then when that ice melts you will get water leaking in the furnace and on the floor. Water will damage the furnace and just make your problems worse. Majority of service calls for my a/c is low on freon turns out to be just a plugged air filter. It is important that you change your furnace filter every month if you use a standard 1 thick filter. Signs A/C is low on Refrigerant. 1  You feel low airflow coming from registers. 2  Air starts to feel warmer from registers. 3  Water on floor by your furnace.  Ice building up on copper lines from a/c to indoor 1  coil. High electrical usage.  House takes longer than normal to cool off.