Lennox 80 AFUE Furnaces
Lennox 80% AFUE gas furnaces from 30,000 to 132,000 BTU, in Merit ML180, Elite EL180 and EL280, and Dave Lennox Signature Collection SL280 models.
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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 -
Quick view Lennox ML180DF045E36A 80% AFUE 44,000 BTU 14.5" Downflow Gas Furnace
The Lennox ML180DF045E36A is a Merit Series single-stage gas furnace rated 44,000 BTU input and 36,000 BTU output...Regular price $1,132.84Sale price $1,132.84 Regular price -
Quick view Lennox ML180UH135E60D 80% AFUE 132,000 BTU 24.5" Gas Furnace
The Lennox ML180UH135E60D is a Merit Series single-stage gas furnace rated 132,000 BTU input and 107,000 BTU output...Regular price $1,355.22Sale price $1,355.22 Regular price -
Quick view Lennox ML180UH110E60C 80% AFUE 110,000 BTU 21" Gas Furnace
The Lennox ML180UH110E60C is a Merit Series single-stage gas furnace rated 110,000 BTU input and 90,000 BTU output...Regular price $1,329.85Sale price $1,329.85 Regular price -
Save $949.29Quick view Lennox ML180UH090E60C 80% AFUE 88,000 BTU 21" Gas Furnace
The Lennox ML180UH090E60C is a Merit Series single-stage gas furnace rated 88,000 BTU input and 72,000 BTU output...Regular price $1,276.12Sale price $1,276.12 Regular price$2,225.41 -
Save $945.40Quick view Lennox ML180UH090E48B 80% AFUE 88,000 BTU 17.5" Gas Furnace
The Lennox ML180UH090E48B is a Merit Series single-stage gas furnace rated 88,000 BTU input and 72,000 BTU output...Regular price $1,208.96Sale price $1,208.96 Regular price$2,154.36 -
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
Cabinets come in 14.5, 17.5, 21, and 24.5 inch widths, in upflow/horizontal (UH) and downflow (DF) versions.
When an 80% furnace makes sense
An 80% AFUE furnace is non-condensing and typically vents through a metal flue, which often makes it the simpler swap when you're replacing another 80% unit. The ML180 and EL180 are single-stage. The EL280 and SL280 are two-stage, with a low stage for milder days. If you want higher efficiency and can run PVC venting and a condensate drain, compare Lennox 93%, 95%, 96%, and 97% AFUE 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 80 AFUE Furnaces are known for.