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In short, Manual J is the protocol that is used in order to determine the correct amount of heat that is needed to keep a house warm for its occupants, and the Add up the square footage of each room—and there you have it! Another way to do this is by taking exterior measurements of the entire house and subtracting the So, you're getting a Manual J load calculation before buying a new HVAC system. Good choice. But what happens when a contractor shows up to do the job?Manual J8 determines your specific home's heating and cooling needs based on where your home is located (Weather location) , which direction your home faces (