Lennox 42,000 BTU Evaporator Coils
Lennox 42,000 BTU (3.5 ton) evaporator coils from the CHX35, CK40DT, and CK40HT families, for 17.5 and 21 inch furnace cabinets.
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Quick view Lennox CHX35-42B-6F 17.5" Width 42,000 BTU Coil
The Lennox CHX35-42B-6F is a cased horizontal evaporator coil for 3.5 ton R-410A systems, with a factory-installed check/expansion...Regular price $1,026.87Sale price $1,026.87 Regular price -
Quick view Lennox CK40DT-42B-01 17.5" Width 42,000 BTU Coil
The Lennox CK40DT-42B-01 is a cased downflow evaporator coil for 3.5 ton R-410A systems, with a factory-installed R-410A...Regular price $1,580.60Sale price $1,580.60 Regular price -
Quick view Lennox CK40DT-42B-71 17.5" Width 42,000 BTU Coil
The Lennox CK40DT-42B-71 is a cased downflow evaporator coil for 3.5 ton R-454B systems, with a factory-installed R-454B...Regular price $1,546.27Sale price $1,546.27 Regular price -
Save $848.51Quick view Lennox CK40HT-42C-71 21" Width 42,000 BTU Coil
The Lennox CK40HT-42C-71 is a cased horizontal evaporator coil for 3.5 ton R-454B systems, with a factory-installed R-454B...Regular price $943.28Sale price $943.28 Regular price$1,791.79 -
Save $709.92Quick view Lennox CK40HT-42B-71 17.5" Width 42,000 BTU Coil
The Lennox CK40HT-42B-71 is a cased horizontal evaporator coil for 3.5 ton R-454B systems, with a factory-installed R-454B...Regular price $1,022.39Sale price $1,022.39 Regular price$1,732.31
The letter in each coil model (B or C) tells you which furnace width it fits.
Matching a 3.5 ton Lennox coil
The coil has to match your outdoor unit's refrigerant and capacity, and your furnace's cabinet width. By refrigerant, R-454B: CK40DT-42B-71, CK40HT-42B-71, and CK40HT-42C-71; R-410A: CHX35-42B-6F and CK40DT-42B-01. Each product page lists the refrigerant and width. Browse every size on the Lennox evaporator coils page, or match the outdoor side with Lennox 42,000 BTU air conditioners.
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. Everything ships from our Kansas City warehouse, and each product page shows whether an item ships free. 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 42,000 BTU Evaporator Coils are known for.