Our load calculator is designed to meet the needs of today's engineering firms and consultants. You'll find familiar features from tools like HAP and CHVAC, along with time-saving extras.
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.
Here are more technical details, along with screenshots from the app.
HeatWise is designed to be easy to use and learn, with a modern user interface. Many inputs have an "automatic" mode where we calculate the values for you based on your building's specifications. This saves you time digging through reference manuals and ASHRAE standards.
Our integrated Quick Help system guides you through the input process. It provides in-app help for every page of the app so that you are never left guessing. Calculate loads start to finish without time-consuming and expensive training courses. We provide detailed explanations of the calculations being performed so that you can sanity-check results.
When you calculate loads, we give detailed load breakdowns with exportable PDF and Excel reports. Figure out exactly when peak load occurs and break it down by component.
Our calculations are based on the 2021 ASHRAE Fundamentals Handbook, using the Radiant Time Series calculation method. We calculate system cooling loads for each hour of one day of each month, for a total of 12x24 samples. We then find the peak loads and show a breakdown by component.
We use your location data to calculate the precise solar irradiance entering your building through windows and skylights. See detailed charts of solar irradiance throughout the day, and tweak your windows for maximum efficiency. We also support external and internal shadings, which may operate on a user-defined schedule.
Load ASHRAE weather-station data for locations across the world. Adjust any location data values to suit your needs. We use this data in our calculations to precisely estimate your building's outdoor temperatures and solar irradiance values throughout the year.
Let us take the headache out of load calculations for you. We designed HeatWise to be easy to learn and use so that you can get results fast.
