HeatWise gives engineering firms and consultants fast, accurate heating and cooling loads for commercial and residential buildings — built on ASHRAE methods and running entirely in your browser.
HeatWise is web-based load calculation software for HVAC design professionals. It handles the ASHRAE bookkeeping so you can size equipment with confidence and move on to the rest of the project.
A load calculation tool made for the people who do this work every day, not a homeowner utility.
Familiar territory if you've used Carrier HAP, Elite CHVAC, or MiTek Wrightsoft — without the friction.
Precise heating and cooling loads for whole buildings or single dwellings, using ASHRAE methods.
Nothing to install or maintain. Projects are shareable with coworkers for review and hand-off.
Firms and consultants switch to HeatWise for three reasons. Here's what sets it apart.
Other tools take hours of training before you calculate anything. HeatWise was built the opposite way — a clear interface and a built-in help system get you to results on the first day.
HeatWise runs in your browser. No installation headaches, no IT tickets, automatic updates, and access from any device. Share a project with a coworker in one click.
Load calculations are one part of your firm's work, so licensing is straightforward and affordable — one-month passes for single projects, subscriptions for regular use.
See pricingFree for 30 days, no card required. After that, pick a monthly subscription or a one-month pass for a single project.
Start here
Full access for 30 days. No credit card required.
Subscriptions
Commercial & residential load calculations, billed monthly.
Residential load calculations, billed monthly.
One-month passes
One month of commercial & residential access. No subscription.
One month of residential access. No subscription.
A side-by-side look at HeatWise against the load calculation tools most firms already know.
| Software | Learning curve | Web based | Import schedules | Output | Energy modelling | Cost | Support |
|---|---|---|---|---|---|---|---|
| HeatWise | Easy | PDF Excel | — | Low | Excellent | ||
| Carrier HAP | Hard | — | — | CSV PDF RTF | High | Limited | |
| Trane Trace | Hard | — | CSV PDF Word | High | Limited | ||
| Elite Chvac | Medium | — | — | CSV PDF Word | — | Medium | Limited |
| Wrightsoft Manual J | Medium | — | PDF Word | — | Medium | Limited |
Comparison based on publicly available information and user feedback as of 2026. Energy modelling is intentionally out of scope for HeatWise — it is a dedicated load calculator.
HeatWise is a focused load calculator, not an everything tool. Here's how to tell if it fits.
Still not sure? See if it fits your workflow — no card required.
HeatWise is increasingly the load calculator of choice for firms and consultants who want a modern workflow.
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!
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.
