2000 sq. ft. x 5o (based on climate zone)=100,000 btus so; between 80k-100k
(100,000 Btu's needed) 80% Efficient furnace: 125,000 Btu capacity; 90% Efficient:
110,000 Btu capacity; 95% Efficient: 105,000 Btu capacity.
go here.
http://www.gasfurnacepricesonline.net/22/what-size-furnace-do-i-need-for-a-2000-square-foot-house/
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