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Most manufacturers carry variable-speed furnaces.

Most manufacturers carry variable-speed, or ECM, furnaces in their line. Focus on Energy not only requires the furnace to have a variable-speed blower for a Cash-Back Reward but also requires the furnace to have multi-stage firing. It's when the furnace is running at low-stage heating that the variable speed blower really saves energy and money. A list prequalified furnaces can be found on the Focus website.

Published Monday, March 07, 2011