"I figure maybe it was too cold in the winter and cold air was drafting into the upstairs? Easy fix with some insulation against the back of the door in the attic right?" ----- That is probably why it was covered. Weather-strip the attic access door as well. Is the back of the side wall insulation covered with rigid foam board or house wrap? If uncovered and gable vent open, it will wind-wash that insulation creating convective loops negating the R-value. Use the foam board between the floor joist (below) and rafter (above) bays to prevent air movement robbing your heated spaces there. Leave 1-1/2" of air space or just touch the air baffles at the sloping ceiling/wall joint. http://www.buildingscience.com/docum...archterm=insul
Cold climate attic ventilation is mainly to remove the moist air and heat in the attic coming from below.
Hot climate ventilation helps remove solar-warmed attic air that causes extra loads on AC units: http://www.buildingscience.com/docum...on?full_view=1
Open one of the “related articles” in the box at the end of the article for further reading. Hope this helps…..
Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!