Lennox 42,000 BTU Air Conditioners
Lennox 42,000 BTU (3.5 ton) central air conditioners in Merit and Elite models, listed at 15.5 to 17 SEER2. Every unit here uses R-454B refrigerant.
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Quick view Lennox ML13KC1-042-230 15.5 SEER2 42,000 BTU Single-Speed Air Conditioner
Single-stage Merit
The Lennox ML13KC1-042-230 is a 3.5 ton (42,000 BTU) Merit Series central air conditioner with a single-stage scroll...Regular price $2,864.18Sale price $2,864.18 Regular priceSee matched systems Lennox ML13KC1-042-230 15.5 SEER2 42,000 BTU Single-Speed Air Conditioner -
Save $438.61Quick view Lennox ML14KC1-042-230 16.5 SEER2 42,000 BTU Single-Speed Air Conditioner
Single-stage Merit
The Lennox ML14KC1-042-230 is a 3.5 ton (42,000 BTU) Merit Series central air conditioner with a single-stage scroll...Regular price $3,265.67Sale price $3,265.67 Regular price$3,704.28See matched systems Lennox ML14KC1-042-230 16.5 SEER2 42,000 BTU Single-Speed Air Conditioner -
Quick view Lennox ML14KC1-041-230 17 SEER2 42,000 BTU Single-Speed Air Conditioner
Single-stage Merit
The Lennox ML14KC1-041-230 is a 3.5 ton (42,000 BTU) Merit Series central air conditioner with a single-stage scroll...Regular price $3,516.42Sale price $3,516.42 Regular priceSee matched systems Lennox ML14KC1-041-230 17 SEER2 42,000 BTU Single-Speed Air Conditioner -
Quick view Lennox EL15KC1-042-230 16.0 SEER2 42,000 BTU Single-Speed Air Conditioner
Single-stage Elite
The Lennox EL15KC1-042-230 is a 3.5 ton (42,000 BTU) Elite Series central air conditioner with a single-stage scroll...Regular price $3,771.64Sale price $3,771.64 Regular priceSee matched systems Lennox EL15KC1-042-230 16.0 SEER2 42,000 BTU Single-Speed Air Conditioner -
Quick view Lennox EL16KC1-042-230 16.5 SEER2 42,000 BTU Single-Speed Air Conditioner
Single-stage Elite
The Lennox EL16KC1-042-230 is a 3.5 ton (42,000 BTU) Elite Series central air conditioner with a single-stage scroll...Regular price $4,313.43Sale price $4,313.43 Regular priceSee matched systems Lennox EL16KC1-042-230 16.5 SEER2 42,000 BTU Single-Speed Air Conditioner -
Quick view Lennox EL16KC1-041-230 17 SEER2 42,000 BTU Single-Speed Air Conditioner
Single-stage Elite
The Lennox EL16KC1-041-230 is a 3.5 ton (42,000 BTU) Elite Series central air conditioner with a single-stage scroll...Regular price $4,486.57Sale price $4,486.57 Regular priceSee matched systems Lennox EL16KC1-041-230 17 SEER2 42,000 BTU Single-Speed Air Conditioner
What to compare at 42,000 BTU
Merit models (ML13KC1 and ML14KC1) are Lennox's entry line, and Elite models (EL15KC1 and EL16KC1) sit a step above. Every unit here is single-stage, so it runs at full output whenever it's on. SEER2 is a system rating, so the coil or air handler you pair affects the number you get. Size it from a Manual J load calculation, and treat your old unit's size as a starting point only. Want to narrow it down? See Lennox 16 SEER2 models at this size and Lennox 17 SEER2 models at this size.
Pair it with a Lennox furnace and evaporator coil, or a Lennox air handler. For a matched indoor side at this size, see Lennox 42,000 BTU evaporator coils and 42,000 BTU air handlers.
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 42,000 BTU Air Conditioners are known for.