Ice in the summer anywhere on a heat pump or central air conditioner is not normal. This includes the complete system, be it the indoor unit, outdoor unit or interconnecting refrigerant lines. It is possible to ice-up the indoor coil however, if the air conditioner is running in cold weather or if the thermostat is turned down extremely low in most any weather.
We recommend never turning the thermostat below 70 degrees. If air conditioning is needed during winter months, then an accessory, which cycles the compressor, keeping ice from forming is required and can be installed by a service technician.
If you see ice on a heat pump or air conditioner in the summer there is a problem. If you live in our service area, we can dispatch a technician to assess the problem. Call us at 865 925-2523. Below is a list of possible causes