Square Footage	Furnace BTU
1,000-1,200 sq. ft. Home	40,000 - 60,000 BTU
1,200-1,500 sq. ft. Home	60,000 BTU
1,500-1,800 sq. ft. Home	60,000 - 80,000 BTU
1,800-2,500 sq. ft. Home	80,000 - 100,000 BTU
2,500-3,500 sq. ft. Home	100,000 to 120,000 BTU

Coleman LX Series TM9T Review: High-Efficiency, Quiet, and Reliable Heating

Average Price (Installed): $4,000 – $4,750
AFUE Rating: 96%
BTU Input: 60,000 – 120,000
BTU Output: 58,000 – 115,000
Cabinet Height: 33 inches
Fuel Savings: Up to 36%

Top Features

Two-stage, 4-speed Direct Drive PSC compressor
Quiet inducer, burner, and blower operation
Supports indoor air quality (IAQ) options
Induced combustion design eliminates the need for a chimney
Compatible with Residential Communicating Controls for enhanced energy savings
Advanced safety features for overheating protection
Technician-friendly installation

The Bottom Line

The Coleman LX Series TM9T is a high-end, energy-efficient furnace that delivers consistent, comfortable heating while helping homeowners save on energy costs. Its advanced design, quiet operation, and robust safety and efficiency features make it a reliable choice for modern homes.

In-Depth Review

Energy and Heating Efficiency

The TM9T is designed to provide top-tier energy performance:

Two-stage design: Adjusts heating output to match the home’s needs for maximum comfort and efficiency.
4-speed Direct Drive PSC compressor: Optimizes airflow for consistent heat distribution.
Insulated blower compartment: Enhances thermal and acoustic performance.
Electronic Hot Surface Ignition: Saves fuel while increasing reliability.
Primary and secondary heat exchangers: Aluminized steel primary with stainless steel secondary ensures maximum heat transfer.
Condensing design: Extracts more heat from less gas, improving efficiency.
Blower-off delay: Enhances cooling SEER performance.
External air filters: Supports indoor air quality by removing particulates and allergens.

Quiet Operation

The TM9T is engineered to operate quietly throughout the home:

Reduced noise from inducer, burner, and blower operation
Insulated components minimize sound transmission
Maintains comfort without disrupting daily activities

Safety Features

Safety is a priority with the TM9T:

100% shutoff main gas valve
Protections against air intake, exhaust vent, or condensate blockage

Warranty Information

The TM9T comes with comprehensive coverage:

20-year limited heat exchanger warranty
10-year limited parts warranty
5-year Complete Assurance™ warranty pledge

Installation and Technical Information

The TM9T is installer-friendly and adaptable for most homes:

Low amp requirement for easier installation
Convertible to propane (LP) gas
Removable bottom panel simplifies conversions
24V, 40VA control transformer and relay supplied for add-on cooling
Flexible duct connectors and movable flanges for varied layouts
Supports upflow, downflow, and horizontal installations
2-pipe sealed combustion or single-pipe vent options
Rotating inducer allows easy venting conversions
Fully supported blower assembly ensures simple access and removal
Compact 33-inch cabinet fits most residential spaces
Quarter-turn knobs for easy door removal
Self-priming internal condensate trap prevents nuisance problems

Final Verdict

The Coleman LX Series TM9T is a top-of-the-line furnace for homeowners seeking energy efficiency, quiet operation, and long-term reliability. With a two-stage variable-speed compressor, advanced heat exchangers, and robust safety and warranty coverage, the TM9T provides dependable performance and comfort for years to come.