ProCalcs addresses the needs of Builders, Architects, Engineers and HVAC companies by delivering high quality results and flexible turnaround to Homeowners, Residential/Commercial Builders and HVAC contractors.

HVAC System Design Form

Residential Load Calculations


Manual J Load Calcs – Determines the total amount of heat gained or lost externally or internally, residential homes.

We can quickly measure the amount of heat gained or lost in your home.

Manual J - Residential Calculations

  • Most proven Industry Standard for sizing home HVAC equipment
  • Required by many permit offices to meet code requirements
  • Ensures Indoor Air Quality, HVAC efficiency & everyday comfort
  • Based on r-values, location, orientation, windows, ect
  • Calculates room x room heat loss (winter) & heat gain (summer)

Want to make sure you pass your HVAC inspection the first time?