HAd a remodel last years where we changed the pitch on a roof and added another 4000 square foot onto the house. The HVAC contractor decided to install the furnace in the attic after we changed the pitch from 2/12 to a 6/12. now when it gets cold the rafters ice up. We made sure to cut holes in the old roof above the soffits to make sure of proper ventilation. so I believe the furnance could be bringing in extra moisture. should the furnace itself be insulated? Should I insulate the new rafters inclosing the attic? The home owner has complained of water running out of the soffits need to figure this out. My first thought is that having the furnace in the attic was a bad idea. just need confirmation on my thoughts.