HVAC Load Calculations Made Easy
Get fast, precise load calculations with HeatWise, our online HVAC load calculator. Made for mechanical engineering firms and consultants.
Try HeatWise free
No credit card required.
Get fast, precise load calculations with HeatWise, our online HVAC load calculator. Made for mechanical engineering firms and consultants.
No credit card required.
Use HeatWise to calculate heating and cooling loads for commercial buildings and houses. Design your building envelope, internal loads, system details, and more.
Calculate accurate heating and cooling load breakdowns. Find the 'just right' equipment size for your client's buildings. HeatWise is designed to be much simpler than other load calculation software, such as HAP or Chvac.
Our calculations are based on the 2021 ASHRAE Fundamentals Handbook, using the Radiant Time Series calculation method. Contact us for technical details.
HeatWise supports both commercial buildings and houses.
HeatWise is suitable for new construction or renovation projects.
HeatWise is free for 60 days, and we need your feedback! Try it today and see if it's right for your team.
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.
Our calculations are based on the ASHRAE 2021 Fundamentals Handbook, an industry standard for HVAC load calculations.
HeatWise runs right in your browser. No need to install software or worry about operating system support.
Get started immediately using our app's integrated help system. No need for extensive training or a huge manual.
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.
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.