A standard 80% AFUE furnace is usually sufficient. The extra cost of a high-efficiency unit may never be recovered because the furnace runs so infrequently. 2. Consider Installation Complexity
The physical location of your furnace can significantly change the "real" cost of upgrading. Should I Get An 80 Or 95 Percent Efficiency Furnace? what efficiency furnace should i buy
A 90%–95% AFUE model often provides the best balance of initial price and monthly savings. A standard 80% AFUE furnace is usually sufficient
Buy a 95% AFUE or higher furnace. In these regions, the heating season is long enough that the 15%–20% fuel savings compared to a standard model will typically offset the higher upfront cost within a few years. what efficiency furnace should i buy