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What size furnace should I buy?

Square FootageFurnace BTU
1,000-1,200 sq. ft. Home40,000 - 60,000 BTU
1,200-1,500 sq. ft. Home60,000 BTU
1,500-1,800 sq. ft. Home60,000 - 80,000 BTU
1,800-2,500 sq. ft. Home80,000 - 100,000 BTU
2,500-3,500 sq. ft. Home100,000 to 120,000 BTU
Coleman LX Series – TM9V Review
Coleman LX Series – TM9V Review

Coleman LX Series – TM9V Review

AFUE: Up to 96%
ENERGY STAR ®: Yes
Burner Type: Dual Stage
Blower Type: Variable Speed
Price: $4,000 – $4,750
BTU Output: 38,000 – 115,000
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Coleman LX Series TM9V Review: Quiet, Efficient, and Reliable Heating

Average Price (Installed): $4,000 – $4,750
AFUE Rating: 96%
BTU Input: 40,000 – 120,000
BTU Output: 38,000 – 115,000
Height: 33 inches

Top Features

  • Two-stage gas burner with variable-speed ECM

  • Quiet inducer, burner, and blower operation

  • Built-in self-diagnostics

  • Induced combustion design eliminates the need for a chimney

  • Compatible with Residential Communicating Controls for enhanced energy savings

  • Advanced safety features prevent overheating

  • Technician-friendly installation

The Bottom Line

The Coleman LX Series TM9V is an energy-efficient, quiet, and reliable furnace. With a 96% AFUE rating and two-stage variable-speed operation, it provides consistent, comfortable heat while reducing energy costs. Its compact design, safety features, and installer-friendly setup make it ideal for modern homes.

In-Depth Review

Heating and Energy Efficiency

The TM9V is designed for top-tier energy performance:

  • Variable-speed ECM drive: Enhances cooling SEER, optimizes airflow, and supports continuous fan options for indoor air quality.

  • Insulated blower compartment: Improves thermal and acoustic efficiency.

  • Electronic Hot Surface Ignition: Saves fuel while increasing reliability.

  • Primary and secondary heat exchangers: Tubular aluminized steel with stainless steel/aluminum fins maximizes heat transfer.

  • Condensing design: Extracts more heat from less fuel, ensuring efficiency without sacrificing warmth.

This combination allows the TM9V to deliver warm, even heat throughout the home while reducing energy consumption.

Quiet Operation

The TM9V is engineered to operate as quietly as a whisper:

  • Quiet inducer, burner, and blower operation

  • Insulated blower compartment reduces noise

  • Maintains comfort without disrupting daily life

Safety Features

Safety is a priority with the TM9V:

  • 100% shutoff main gas valve

  • Protections for air intake, condensate blockage, and exhaust vent

  • Self-diagnostics for safe operation

Warranty Information

The TM9V comes with comprehensive warranty coverage:

  • Lifetime limited heat exchanger warranty

  • 10-year limited parts warranty

  • 5-year Complete Assurance™ warranty pledge

These warranties provide peace of mind and long-term reliability.

Reliability

This furnace is built to last for years:

  • Silicone nitride hot surface ignition ensures dependable starts

  • Supports indoor air quality options

  • Complete Assurance™ warranty reinforces durability

Installation and Technical Information

The TM9V is technician-friendly and adaptable to most homes:

  • Low amp requirements make replacement easy

  • All models are convertible to propane (LP) gas

  • Removable bottom panel simplifies conversions

  • 24V, 40VA control transformer and blower relay supplied for add-on cooling

  • No knockouts required, simplifying installation

  • Easy access to controls for wiring and power connections

  • Movable duct connector flanges allow flexible placement

  • Compatible with upflow, horizontal (left/right), and downflow installations

  • Venting options: 2-pipe sealed combustion or single-pipe vent using indoor air

  • Inducer rotates for easy venting conversion

  • Communicating control system ready with 4-wire bus connection

  • Fully supported blower assembly allows easy removal

  • Compact 33-inch cabinet fits tight spaces

  • Quarter-turn knobs for easy door removal

  • Patent-pending internal condensate trap manages condensate and is self-priming

Final Verdict

The Coleman LX Series TM9V is a safe, quiet, energy-efficient, and reliable furnace. Its two-stage variable-speed ECM blower, efficient heat exchangers, and condensing design ensure maximum comfort while reducing energy costs. Compact, durable, and easy to install, the TM9V is an excellent long-term heating solution for modern homes.

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