The top pick among the 80% furnaces is the Signature Collection Lennox SL280V with a two-stage gas valve.Lennox mid-price and high-price two-stage models run on low capacity most of the time for more balanced heating.But they run on full capacity and might heat past the thermostat setpoint Lennox single-stage 80% furnaces are affordable.So they transfer an inefficient 80% of the heat they create into your home’s ductwork The four Lennox 80% AFUE furnaces have single heat exchangers. Here’s a closer look at what the various Lennox furnace models offer: Performance: 5 single-stage furnaces from the Merit and Elite Series 3 two-stage furnaces in the Elite Series 2 variable-capacity furnaces in the Signature Series.Efficiency: 80% AFUE furnaces and 90%-plus AFUE furnaces.
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