- Why change your old furnace to a Rheem Classic 90? The Classic 90 furnace meets the Energy Star standards with an efficiency of 90%. With a stainless steel heat exchanger and the diagnostic system monitor this furnace is built to last. The heat exchanger has a lifetime warranty.
- Why is Rheem Contour Classic 90 plus a better furnace? The Contour has the above features plus these additional benefits. It runs at 94% efficiency, and is the only truly modulating furnace which means the temperature will be more even through-out your home and remains within 1/2 degree of the thermostat set point. With a high efficiency ECM blower motor, this furnace uses practically no electricity.
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