How to use
How to use the HVAC Load Calculator
HVAC Load Calculator is built for contractors who need a practical HVAC load calculator during estimating, dispatch planning, or proposal review. Use it to turn job details into a clear working number before you finalize pricing in Dabe or your operating system.
When to use this HVAC load calculator
Use this for an early cooling-load estimate when discussing equipment options, replacement scope, or whether a deeper Manual J load calculation is needed. It is a screening tool for HVAC load calculation conversations, not a substitute for a full design.
Step-by-step workflow
Work through the fields in order. The calculator is designed so the most important job inputs come first and supporting assumptions follow after.
- 1.Enter square footage and ceiling height.
- 2.Select region, insulation, sun exposure, windows, and tightness assumptions.
- 3.Add occupant, kitchen, glass-room, and device assumptions where relevant.
- 4.Compare calculated load and recommended BTU range with your field assessment.
How to read the result
The calculator returns a cooling load in BTU, tons, and a recommended equipment range. Use the result to frame replacement package discussions, then confirm final equipment sizing with field measurements and appropriate Manual J methodology.
Before you use the number in an estimate
Review the output against your company pricebook, local market, jobsite constraints, and customer expectations. If the result affects equipment sizing, margin, financing, or scope, document the assumptions in the estimate notes so the team can audit the decision later.