Calculating Furnace Size?


The best way to calculate a furnace size is to ask a contractor. They are trained in things like this and can ensure your sizing is done properly. The scientific method used is called The manual J load calculation.
Q&A Related to "Calculating Furnace Size?"
1. Use a furnace calculator, such as HVAC Equipment Size Finder, Home Heat Loss Calculator or the Energy Star Furnace Calculator, to determine the amount of BTUs needed for your home
1. Determine if you are measuring a two-dimensional ventilation duct or a three-dimensional ventilation duct. Figure out where the beginning and end of the duct measuring points are
1. Measure the total distance around the circular side of the tank in inches. This is the tank's circumference. For this purpose, assume a circumference of 62.8 inches. 2. Divide
1. Measure the inside diameter of the pipe. This measurement is from the inside wall, across the diameter of the pipe, to the other side of the wall's interior. For pipe under 14
1 Additional Answer
There are many ways to calculate the right furnace size for your house, and it is important that you do so. The most accepted method is the Manual J Load calculation that factors in construction material, insulation levels, windows, and sizes of rooms among other things. The software to do this calculation is available for purchase. If you are replacing an existing furnace you can simply replace it with a model that has the same output BTU.
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