We did an addition on our house and installed a two zone heat system with one of the HVAC units in a small room in our unfinished attic. There are insulated ducts in the attic also coming from the room for this system. The problem we are having is that we cannot get the temperature in the attic under about 40 degrees. We have added additional roof venting (both soffit and top of roof) with little effect. We want to get the temperature closer to the outside to prevent ice dams and condensation problems.
The HVAC room is drywalled and has insulation. The ducts are insulated the flexible insulated variety (R-4?). It seems like the only explanation is that there is heat coming from the HVAC room or duct work. Any suggestions?
Note: we live in Northern Illinois.