Join Date: Feb 2008
Location: Toronto Downtown, Bell VDSL Fibe
bb_c: For starters you're looking at a high-efficiency furnace, venting outside through a side wall. Existing furnace owes you nothing, and you will save operating $$ on new model. Two-stage worth considering.
However, you may want to consider your existing water heater at the same time and go for a "hydronic" setup, with water heater providing heat and airhandler circulating it via heat exchanger. May make sense if there are constraints on venting (eg condo). Pricier solution, but long term benefits.
And you or your contractor should do a heat-loss calculation to determine the size of furnace required - back of envelope would be existing furnace @ 60% vs new furnace at 90% efficiencies. (eg 100*0.6=x*0.9; suggests 65K Btu, if original 100K Btu).
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