![]() Most Efficient Gas Furnace (SLP98V) 98.7 AFUE You can find a lot of positive feedback for this heat exchanger online. The Lennox Signature Collection SLP98V gas furnace achieves a best-in-class 98.7% annualized fuel efficiency ( AFUE) just 2.3% of the heat produced is lost with the combustion gas exhaust. This Lennox gas furnace is built with primary and secondary heat exchangers and condensing technology to capture and transfer more heat than any other gas furnace available today. ![]() This superior efficiency level is also achieved in the SLP98V with a modulating gas valve that, like cruise control, runs at the optimal level needed to keep temperatures perfectly balanced without overheating. The variable-speed blower contributes to efficiency by effectively utilizing the heat produced and transferred, never blowing unheated air at the beginning or end of the cycle. This is another feature that makes the unit very reliable and durable. Lennox claims the Silicon nitride construction ensures the product lasts for years without regular breakdowns. This might be true, but almost all brands claim their units are reliable and strong. Related Article: How to Choose Furnace Ignition: Standing Pilot vs.
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