You could have downloaded Houstrad 1.0.0.1 from our software library for free. Houstrad lies within Home & Hobby Tools, more precisely Shopping. The most popular version of the Houstrad is 1.0. The Houstrad installer is commonly called houstrad.exe. This free tool was originally produced by CanmetENERGY.
From the developer:
HOUSTRAD software provides an easy-to-use method to demonstrate compliance to the envelope requirements of the Model National Energy Code of Canada for Houses (MNECH) using trade-offs.
You may want to check out more software, such as SSSort or Torque on an Electric Dipole in a Constant Field, which might be similar to Houstrad.