It might be the time to check your air con properly.
There are few reason why your air conditioner freezes up after sometime you switch on the air con. It might cause leak while the ice is melting. It also mean the cool air will not be discharged properly and ice may built up on the coil parts.
1: restricted air flow might cause this problem
2: Low refrigerant / leak of freon > this is the most common issue cause "Icy on the coil "
while the freon level in the air con system is low / leaks, there will be a decrease in the saturation point temperature of the system.
