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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

Brock furnaces

96% Variable Speed, Two-Stage Non-Communicating 35-IN Condensing Gas Furnace

• Variable-speed, constant-torque ECM blower motor,
two-speed inducer motor, and two-stage gas valve.
• Fully-insulated casing including blower section.
• Aluminized-steel primary heat exchanger.
• Stainless-steel condensing secondary heat exchanger.
• Silicon Nitride Hot Surface Igniter.
• Adjustable blower speed for heating, cooling, continuous
fan, and dehumidification.
• All sizes meet ENERGY STAR® Version 4.1 criteria for gas
furnaces: 95.0%+ AFUE.