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Heat Loss Calculation

Posted by Raymond VinZant Plm Prof on January 19th, 2003 04:12 PM
In reply to new gas furnace for 100-yr-old house, top flat by Nancy on January 18th, 2003 11:13 PM [Go to top of thread]

You really have to do a heat loss calculation of the building. You need to know the R Value of the walls, the roof, and the windows. Take them into a Wholesaler or a HVAC contractor. They can make the calculation before you buy the unit. The windows will have a R value from the installer. The walls can be calculated aproximately, if you know the thickness, and the basic type of insulation (there may be none). The same applies with the roof. If you have the square foot you will be able to decide the size of furnace. In addition, think about wall insulation. A new energy efficient furnace is only as good as the insulation of the building
Raymond VinZant

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