How can I estimate the correct size fo a gas furnace?Post created: 2013-01-30 Type of Equipment: Furnace Views: 677
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On 2013-01-31 JB wrote:
This is hard to do if you don't have much experience. There are a number of variables that need to be considered such as layout of the house, regional climate, size of rooms, duct work, insulation R value and so on. Most professionals do what is called a manual J calculation.
That said you can go here for an online Manual J: http://www.loadcalc.net/. However, I have no idea of the accuracy of this program, but it may help provide a sense of what you need. You can also learn more here: http://blog.heatspring.com/tag/manual-j-calculation/.
To keep legal happy, let me just say that I am not an HVAC contractor, and you should never even look at your furnace without having a qualified, liability accepting HVAC contractor present. To keep sales happy, let me just say that you can find an HVAC contractor that's happy to take your money here: http://www.furnacecompare.com/perl/find_contractors.pl.
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