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Manual J Doesn’t Tell You Equipment Capacity

The amount of heating and cooling your house needs isn’t the only factor in determining the size of your heating and cooling equipment

Posted on Mar 8 2017 by Allison A. Bailes III, PhD
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Here's a little conundrum for you. To get the right amount of heating and cooling to each room in your home, you need a load calculation. Rules of thumb don't work. But if you do a load calculation, the result isn't the size of air conditioner, heat pumpHeating and cooling system in which specialized refrigerant fluid in a sealed system is alternately evaporated and condensed, changing its state from liquid to vapor by altering its pressure; this phase change allows heat to be transferred into or out of the house. See air-source heat pump and ground-source heat pump., furnace, or boiler you need. It's only the first step to sizing your system.

Do you know why? Let's take a look.


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  1. Energy Vanguard

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Outdoor Wood Boilers

Posted on Mar 10 2009 by Alex Wilson

Over the past few weeks, we’ve been looking at wood burning—a popular and affordable heating option in rural New England. Ten or 15 years ago, a new option started showing up. Driving along country roads, we began to see shed-like structures with smoke billowing from smokestacks. These are outdoor wood boilers (sometimes called outdoor wood furnaces), and they have been the focus of considerable attention and debate in recent years, mostly over the pollution they generate.


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