Air Conditioning Repair near 27th Ct NE. I received a call from a customer who reported that their air conditioner was freezing up. I arrived at the customer's house and inspected the air conditioner. I found that the air filter was dirty and restricting the airflow, causing the evaporator coil to freeze. I replaced the air filter and thawed the evaporator coil. I then checked the air conditioner's refrigerant levels and found that they were low. I topped up the refrigerant and tested the air conditioner, confirming that it was now cooling efficiently and no longer freezing up.