Summer is the season that tests glass here. Hillsboro airport normals put the July and August dew point near 53°F, only about 2°F below a 55°F cellar, so, by our reading of these figures, a single pane chilled close to cellar temperature leaves little margin against fogging on the room side, particularly in a house without air conditioning. Insulated double-pane glazing keeps the room-side surface well above that point.
July and August also average highs near 82°F at the Beaverton 2 SSW station, with about 15 days each year hitting 90°F, so glass adds heat at the moment the cooling is most stretched. A glass front on an existing basement or spare room therefore needs cooling sized for those afternoons; permits for any new walls or wiring follow the Oregon rules explained on our basement page and come from the City of Beaverton Building Division.