90 percent AFUE Gas Condensing Furnace

Updated November 30, 2014
90 percent AFUE gas furnace

Bottom line

Also known as condensing furnaces, furnaces with AFUE ratings of 90 percent or greater condense the water vapor in exhaust gases to extract additional heat. Venting is directly through a wall to the outside through a PVC pipe, rather than through the chimney. This efficiency comes at a cost, however. Experts say a condensing furnace may cost about $1,000 more than a furnace with an annual fuel utilization efficiency (AFUE) rating of around 80 percent. Installation costs may be higher as well. However, because a condensing furnace will use less fuel over time, the energy savings may be enough to recoup the extra cost. In addition, a condensing furnace will emit less carbon dioxide, which may be an important factor for those concerned about pollution.

ProsLow long-term energy costs, Low CO2 emissions, You may be able to buy a smaller furnace, May qualify for local tax credits and utility company rebatesConsHigh initial costs, Less cost-effective in mild climate