I have had two contractors in to price out a new high efficiency (90%) gas furnace for my 25 year old home located in Calgary Alberta. So we get some pretty cold days
Both have said that a new horizontal exhaust is required out the side of the house. Both contractors will also drain condensed water from the furnace to a floor drain inside my basement.
One didn't recommend the high efficiency furnace. He said that the new exhaust will produce a sizable condensation cloud which will frost over a window which is about 3-4 feet above the exhaust. As well he thought condensation would freeze on my neighbors house which is about 6-8 feet away.
Does a high efficiency gas furnace really produce a cloud of condensation? (It gets quite cold here, with a lot of freeze thaw cycles over the winter)
Would the furnace exhaust come out with enough force to frost up my neighbor's exterior wall 6 feet away?