QUEBEC CITY - The great divide between HVAC contractors and engineers is probably at its widest point where residential load calculations are concerned. Contractors don't see a practical way to do ...

What is a load calculation? A load calc determines just how much heating and cooling is needed for a specific house or building. It takes the guesswork out of sizing HVAC equipment. Its methods have ...

Why is it essential to provide a load calculation before retrofitting a new heating and cooling system in an older house? To make sure the right size systems get installed, use Manual S. To design the ...

Based on the 2020 National Electrical Code. Article 220 of the 2020 National Electrical Code (NEC) contains the requirements for calculating demand loads for branch circuits, feeders, and services.