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| 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 | 
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