Manual J Load Calculations: frequently asked questions
These answers are general. For your situation, check the official sources listed below or ask a professional.
What is a Manual J?
The ACCA standard method to calculate a home's heating and cooling loads, room by room.
Is it required?
The residential code requires equipment sizing from Manual J or an equivalent; enforcement varies by building department.
What information is needed?
Plans, orientation, window types and sizes, insulation levels and air tightness assumptions.