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 TM8Y Review: Economical and Reliable Mid-Efficiency Furnace

The Coleman LX Series TM8Y is a mid-efficiency gas furnace designed for homeowners seeking a balance between comfort, performance, and affordability. With its two-stage burner and variable-speed ECM blower, it delivers consistent heating while optimizing energy use.

Average Price (Installed): $3,800 – $4,800
AFUE Rating: 80%
BTU Input: 60,000 – 120,000
BTU Output: 48,000 – 96,000
Burner Type: Two-Stage
Blower Motor: Variable-Speed ECM
ENERGY STAR® Certified: No
Warranty: Base – 5 years (Parts), 20 years (Heat Exchanger); Registered – 10 years (Parts), Lifetime (Heat Exchanger)

Top Features

Two-Stage Burner – Runs at lower capacity during milder conditions and ramps up for colder days, improving energy efficiency.
Variable-Speed ECM Blower – Optimizes airflow and maintains even indoor temperatures while reducing noise.
Flexible Installation – Supports both upflow and horizontal setups, fitting into tight spaces like closets or basements.
Strong Warranty Coverage – Lifetime coverage on the heat exchanger when registered, offering long-term peace of mind.

The Bottom Line

The TM8Y is a reliable, budget-friendly furnace for homes in mild climates. While it lacks ENERGY STAR® certification, its two-stage burner and variable-speed blower enhance comfort and efficiency compared to traditional single-stage furnaces. Strong warranty options make it a solid long-term investment for homeowners.

In-Depth Review

Heating Efficiency

With an 80% AFUE rating, the TM8Y effectively converts fuel into usable heat. Key efficiency features include:

Two-Stage Burner: Uses less energy during mild weather and full power during colder days.
Variable-Speed ECM Blower: Adjusts airflow to match demand, improving temperature consistency throughout the home.

Comfort and Performance

Consistent Heating: The two-stage burner maintains a steady indoor temperature without frequent cycling.
Improved Airflow: The variable-speed blower reduces hot and cold spots while keeping operation quieter.

Noise Reduction

Quieter Operation: ECM blower runs smoothly compared to fixed-speed blowers.
Sealed Cabinet Design: Minimizes sound for a more peaceful indoor environment.

Safety Features

Automatic Gas Shutoff: Prevents potential gas leaks.
Pressure Switches: Ensures safe airflow and proper combustion.
Sealed Combustion System: Reduces exposure to harmful gases and improves indoor air quality.

Warranty Information

Coleman provides strong warranty coverage for the TM8Y:

Base Warranty: 5 years on parts, 20 years on the heat exchanger
Registered Warranty: 10 years on parts, lifetime on the heat exchanger
Unit Replacement Warranty: 5 years

Installation and Sizing

The TM8Y supports upflow and horizontal installation, making it a flexible option for various home layouts. Its compact size allows for easy installation in closets or basements.

Final Verdict

The Coleman LX Series TM8Y is a cost-effective and dependable mid-efficiency furnace. Its two-stage burner, variable-speed blower, and strong warranty make it a step up from single-stage models, offering better comfort, quieter operation, and energy savings. For homeowners in mild climates seeking a reliable, mid-range furnace, the TM8Y is a solid choice.