Need to renovate an old house, built in the 50's, extended later in the 60's, 90's and 2000's. I want to calculate the heat loss, energy requirements to install a heat pump. So, I am writing a relatively simple Python program to compute the heat requirements (max total and max per room) to get the possible energy savings if changing windows, isolating etc.

By doing the calculations myself, I can play with different scenarios, I can also integrate the effect on the material quality uncertainty. Nothing fancy, but it fits my needs.