("Energy Simulation Tools" should probably be a Sub-Forum. I have compiled a pretty big list of other tools that Ecorenovators might want to try.)
I have located another Energy Simulation Tool, this one on the Build It Solar website. This tool has a very straight-forward interface. You'll need to enable JavaScript in order to use it. IMHO, it would be more useful if it were in Excel or equivalent form, so that heat-loads could be established, while off-line.
This tool is called
Home Heat Loss Calculator, check it out...
Regards,
AC_Hacker