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LoopCAD 2021

Heat loss calculations in LoopCAD are for residential applications. For commercial applications it is recommended to use the Manual Heat Loss mode.

Activation Help Topics

Upgrade Software with Active Subscription

Applies to: LoopCAD 2022, HeatCAD 2022, PlumbingCAD 2021

LoopCAD and HeatCAD include an automated activation feature making the process of upgrading and activating your software easier and faster. If the following applies to you, then you can successfully use this upgrade and auto-activation feature:

  • You have an earlier licensed version of the program, and
  • Your subscription is active, and
  • You are still using the same computer.

If your subscription has expired, see the Subscription Renewal help topic for instructions on how to renew as part of the upgrade process.

If you need the setup file to install the software, go to the corresponding downloads page:


  1. First install the newest version of the software (use links above).
  2. Run the program on the computer that you want activated.
  3. If the Activation window does not automatically open, click the Activate link.
  4. Now click the green Update Activation button.
  5. Complete the login when prompted.
  6. The activation code will be generated and automatically applied to your computer. Just click OK after it is completed.
Activation Help Topics