Lennox 66,000 BTU Furnaces
Lennox gas furnaces at 66,000 BTU input, in Merit ML180, ML193, ML196, and ML296, Elite EL196, EL280, and EL297, and Dave Lennox Signature Collection SL280 models.
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Quick view Lennox ML180UH070XE36B 80% AFUE 66,000 BTU 17.5" Gas Furnace
The Lennox ML180UH070XE36B is a Merit Series single-stage gas furnace rated 66,000 BTU input and 53,000 BTU output...Regular price $2,686.57Sale price $2,686.57 Regular price -
Quick view Lennox ML180UH070XE36A 80% AFUE 66,000 BTU 14.5" Gas Furnace
The Lennox ML180UH070XE36A is a Merit Series single-stage gas furnace rated 66,000 BTU input and 53,000 BTU output...Regular price $2,686.57Sale price $2,686.57 Regular price -
Quick view Lennox ML180DF070E36B 80% AFUE 66,000 BTU 17.5" Downflow Gas Furnace
The Lennox ML180DF070E36B is a Merit Series single-stage gas furnace rated 66,000 BTU input and 54,000 BTU output...Regular price $1,186.57Sale price $1,186.57 Regular price -
Quick view Lennox ML180DF070E36A 80% AFUE 66,000 BTU 14.5" Downflow Gas Furnace
The Lennox ML180DF070E36A is a Merit Series single-stage gas furnace rated 66,000 BTU input and 53,000 BTU output...Regular price $1,186.57Sale price $1,186.57 Regular price -
Save $907.00Quick view Lennox ML180UH070E36B 80% AFUE 66,000 BTU 17.5" Gas Furnace
The Lennox ML180UH070E36B is a Merit Series single-stage gas furnace rated 66,000 BTU input and 53,000 BTU output...Regular price $1,107.46Sale price $1,107.46 Regular price$2,014.46 -
Quick view Lennox ML180UH070E36A 80% AFUE 66,000 BTU 14.5" Gas Furnace
The Lennox ML180UH070E36A is a Merit Series single-stage gas furnace rated 66,000 BTU input and 53,000 BTU output...Regular price $1,107.46Sale price $1,107.46 Regular price -
Save $962.32Quick view Lennox ML180UH070V36B 80% AFUE 66,000 BTU 17.5" Variable-Speed Gas Furnace
The Lennox ML180UH070V36B is a Merit Series single-stage gas furnace rated 66,000 BTU input and 53,000 BTU output...Regular price $1,402.99Sale price $1,402.99 Regular price$2,365.31 -
Quick view Lennox ML180UH070V48B 80% AFUE 66,000 BTU 17.5" Variable-Speed Gas Furnace
The Lennox ML180UH070V48B is a Merit Series single-stage gas furnace rated 66,000 BTU input and 53,000 BTU output...Regular price $1,508.96Sale price $1,508.96 Regular price
Ratings run 80% to 97% AFUE, in 14.5 and 17.5 inch upflow/horizontal (UH) and downflow (DF) versions.
Choosing a 66,000 BTU Lennox furnace
The ML180, EL280, and SL280 are 80% AFUE and typically vent through a metal flue, which often makes for a simpler swap when you're replacing another 80% furnace. The ML193, ML196, ML296, EL196, and EL297 are condensing furnaces, so plan for PVC venting and a condensate drain. The ML180, ML193, ML196, and EL196 are single-stage. The ML296, EL280, EL297, and SL280 are two-stage, with a low stage for milder days. Size the furnace from a load calculation, then match the cabinet width to your space and your evaporator coil.
To compare by efficiency, see Lennox 80%, 93%, 96%, and 97% AFUE furnaces. Need a different size? See Lennox 60,000 BTU furnaces and Lennox 80,000 BTU furnaces.
Call (913) 364-0070, Monday to Friday, 9am to 5pm CST, and we'll help you confirm sizing and an AHRI-matched pairing before you order. Free shipping on major equipment from our Kansas City warehouse to every state and D.C. except Alaska, Hawaii, Washington, Oregon, and Idaho, where you pay the shipping rate shown at checkout. Each product page shows whether an item qualifies. HVAC USA is an authorized Lennox reseller, and everything we sell is new factory equipment. Your full Lennox warranty applies when a licensed, manufacturer-certified contractor installs your system and registers it within 60 days.
Get Expert Help
Not sure which of these systems is right for your application? Our team can help you compare models, sizes, and configurations to ensure the best fit for your climate and space.
Reach out to us at (913) 364-0070 or info@hvacusa.store. Reach out to find the right system to help you experience the long-term reliability and performance that Lennox 66,000 BTU Furnaces are known for.