I am trying to study the energy consumption trend for different floor plates for different climate zones & cities all around the globe.
In most of the locations, the compact floor plates (like circle) is the most efficient one, while the cruciform design (see the image below), which has more perimeter spaces & envelope, is the least efficient one.
Although for the colder climate zones, the results tend to shift slightly but for couple of locations (for ex, Calgary) the cruciform is one of the most efficient floor plate. I looked at the numbers thoroughly & have done a thorough comparison between the kBtus figures, but it will be great if you folks can provide me an insite here.
I need to know what are the factors that can help the cruciform design to be efficient for the colder climates.
Assumptions here: 
Input Summary for the floor plates: 
Results: 
