HVAC Load Calculations Made Easy
Get fast, precise load calculations with HeatWise, our online load calculator. Made for engineering firms and consultants.
30-day free trial
ASHRAE compliant
Get fast, precise load calculations with HeatWise, our online load calculator. Made for engineering firms and consultants.
Why choose HeatWise over competing software like Carrier Grade HAP, Elite CHVAC, or MiTek Wrightsoft? Here's what sets us apart.
Other software can take hours of training to get started. We were frustrated by this complexity and designed HeatWise to be different. With our built-in help system and intuitive interface, you can calculate results on the first day.
Unlike competing software, HeatWise runs in your web browser. Avoid installation headaches, get automatic updates, and access your projects from any device. Seamlessly share projects between co-workers for collaboration.
We know load calculations are just one part of your firm's work, so we made HeatWise licenses straightforward and affordable. We offer one-month passes for single projects and subscriptions for frequent users.
See pricing →Free for 30 days. No credit card required to get started.
Full access for 30 days. No credit card required.
One-Month Passes
One-month access to residential load calculations.
One-month access to commercial & residential load calculations.
Subscriptions
Subscription to residential load calculations.
Subscription to commercial & residential load calculations.
See how HeatWise compares to other HVAC load calculation software on the market.
| Software | Learning Curve | Web Based | Import Schedules | Output Formats | Energy Modelling | Cost | Support |
|---|---|---|---|---|---|---|---|
| HeatWise | Easy | PDFExcel | Low | Excellent | |||
| Carrier HAP | Hard | CSVPDFRTF | High | Limited | |||
| Trane Trace | Hard | CSVPDFWord | High | Limited | |||
| Elite Chvac | Medium | CSVPDFWord | Medium | Limited | |||
| Wrightsoft Manual J | Medium | PDFWord | Medium | Limited |
* Comparison based on publicly available information and user feedback as of 2025
HeatWise is designed for specific use cases. Here's how to know if it's the right fit for your projects.
Still not sure? Try HeatWise free for 30 days to see if it fits your workflow.
Start Free TrialHeatWise is increasingly being used by firms and consultants looking for a modern load calculator. Here are a few testimonials from our users:
"HeatWise has been a fantastic solution for our load calculations. We were looking for something that checked all of our boxes; cost friendly, easy to use, easy to access, great support, continuing to innovate/improve, and next level reporting and HeatWise checked them all. I have used multiple programs for measured load calcs, this is the best experience I have had! I have a had a few questions and even a feature request and they have been quick to respond and added the feature right away! Highly recommend HeatWise to other contractors and engineers!"
"When our IT department restricted downloads of our outdated, unsupported load calculation software, HeatWise provided the perfect solution - its web-based platform eliminated approval bottlenecks and deployment hurdles while delivering straightforward, accurate calculations for our needs in an industry that has become unnecessarily complicated with new energy modeling platforms and different calculation methods."
"I used HeatWise to calculate heating/cooling loads for a fourplex project. I'm stunned by the user-friendliness, interface, and the graphics provided at the end of the calculation. I'll use HeatWise for my projects going forward and recommend it to HVAC engineers!"
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.