[gunn427]

First thing to check is your furnace filter, blower belt (if it's not direct drive). If the air flow is reduced across the evaporator the suction pressure will be reduced and along with it the evaporator temp. This is the most common cause of ice ups. Most coils run at 34F, if you don't flow enough air that temp will fall below 32F and will build frost,as the frost builds, less air, the ice begins to build and will travel back the suction line to the compressor. If your air flow checks out you may indeed need a tech. If its a filter or belt, change it and your good to go.