Hello all. I've been teaching myself C++ programming and had an idea for a project. I am building a calculator for the heat loss of a room when an outside door/window is open. I'm currently writing out the functions I need to make this happen... Now what I need help with is this. I can't seem to stumble upon a formula I can use to test ambient air to outside air temps through the means of wind or just exposing the two through the door. I guess it's not the best explanation but do you get what I mean?? I plan to add in three variables if necessary to match if higher wind speeds were forcing more cold air in. Anyway any help on how to solve this would be much appreciated.