Duct Sizing & Velocity Checker
Check duct velocity, equivalent diameter, airflow density, and noise-risk level.
Open ToolCooling Load Estimator
A planning-level HVAC calculator for estimating sensible and latent cooling load using area, occupancy, lighting, equipment, ventilation, envelope load, and project margin.
Inputs
Forms are empty on load. Use sample data to preview the workflow or enter your own project values.
Learn more
Formula logic, use cases, assumptions, and limits for this tool.
How this tool helps
Use this for early HVAC planning, tender checks, and sanity checks before detailed heat-load software is used. It combines people, lighting, equipment, envelope, ventilation, latent allowance, and margin into a practical cooling estimate.
Assumptions and limits
This tool provides a planning-level result. It does not replace detailed engineering design, approved software, manufacturer data, authority requirements, or project specifications.
Typical use cases
- Early estimation and tender support.
- BOQ sanity checking and technical review.
- Site discussion before final engineering verification.
- Comparison of alternatives using consistent assumptions.
Result interpretation
Read the recommendation, warning, and confidence sections together. A result without warnings is still not an approval; it only means the entered values did not trigger built-in planning alerts.
Related tools
Other tools in HVAC.
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Compare airflow by ACH, occupancy, cooling tons, and design margin.
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Exhaust Fan Sizing Calculator
Estimate exhaust fan capacity from room volume, ACH, equipment count, and margin.
Open ToolCalculation methodology
Total kW = envelope + lighting + equipment + people + ventilation, with latent allowance and design margin. TR = kW / 3.517.
Inputs are treated as planning assumptions. The calculator shows warnings when entered values fall outside practical thresholds or selected standard-profile limits.
Version history
- v1.3.6-prelaunch: Added methodology, standard profile support, version notes, and direct PDF report download.
- v1.3.5: Calculator page added with sample data, warnings, and print-ready report layout.
Stage 2 roadmap: optional saved projects, dashboards, and shared calculation history without forcing login for free use.
Trust and verification
Every result includes assumptions, warning logic, and a downloadable report. Final engineering decisions still need qualified review, local authority approval, manufacturer data, and project specifications.
Worked example
Use the sample data button to load a realistic scenario, then download the PDF report to review inputs, results, methodology, warnings, and disclaimers in one place.