Furnaces Comparisons

Furnace type	Pros and Cons
Comparison Chart - Furnaces
90% AFUE gas furnace Where to Buy (*est. installed cost $3,000 and up)	Lower long term energy costs, but it may take a long time to recoup savings. Best balance for most since homeowners are likely replacing an older less efficient system.
Multi-stage modulating gas furnace, 92% to 97% AFUE Where to Buy (*est. installed cost $3,500 to and up)	Lower long term energy costs, but it may take a long time to recoup savings. High-efficiency systems may require new ducting and other modifications.
80% AFUE gas furnace Where to Buy (*est. installed cost $2,000 and up)	Generally requires less retrofitting and may be the better choice if you plan to sell your home within five years, or plan to use as a rental property.
Sealed-vent oil furnace Where to Buy (*est. installed cost $2,000 and up)	New oil furnaces, though lower in stated efficiency than gas furnaces, are still far more efficient than old models.