Familiar capabilities from tools like HAP and CHVAC, plus the time-saving extras that come from building on the modern web.
Get started immediately using our app's integrated help system. No need for extensive training or a huge manual.
HeatWise runs right in your browser. No need to install software or worry about operating system support.
Our calculations are based on the ASHRAE 2021 Fundamentals Handbook, an industry standard for HVAC load calculations.
We handle ventilation/infiltration, walls, roofs, floors, windows, doors, skylights, shadings, buffer spaces, and more.
HeatWise is under active development. We release new features almost every week, which you'll receive automatically.
Give co-workers read and write access to your projects. Export results to Excel for further analysis.
The methods behind the numbers, with screenshots from the app.
HeatWise has a modern, focused interface. Many inputs have an automatic mode that calculates values from your building's specifications, so you spend less time digging through reference manuals and ASHRAE tables.
Quick Help guides you through every page of the app, so you're never left guessing. Calculate loads start to finish without a training course, with clear explanations of each calculation so you can sanity-check the results.
Every run produces detailed load breakdowns with exportable PDF and Excel reports. See exactly when peak load occurs and how each component contributes to it.
Calculations follow the 2021 ASHRAE Fundamentals Handbook using the Radiant Time Series method. HeatWise computes system cooling loads for each hour of a design day in every month — 288 samples — then reports the peak with a component breakdown.
HeatWise uses your location data to compute the solar irradiance entering the building through windows and skylights. Review irradiance charts across the day and tune glazing for efficiency, with support for scheduled external and internal shading.
Load ASHRAE weather-station data for locations worldwide, and adjust any value to suit your project. HeatWise uses this data to estimate outdoor temperatures and solar irradiance throughout the year.
HeatWise is built to be learned in an afternoon and trusted on every project. Try it free for 30 days — no credit card, no install.
