# Place a greenhouse: how to orient it for the best effect?

I'm looking for the best orientation (North-East-South-West) of a greenhouse (simplifiable as a rectangular solid).
My question is more specifically about the sun position effects (over the times of the day and over the days of the year).
With sun effect I mean both solar exposure for plants and temperature increase within the greenhouse. Anyway I think both aspects go hand-in-hand.

Thus, how can I calculate the position of the greenhouse?

PS: if can help to better focus my question, the question could also be re-arranged e.g. for house's rooms: which is the coldest/hottest room in my house?

EDIT: solar exposure's issue was solved. Now it remains how to deal with temperature gain. In short: with maximum solar exposure I will get automatically the higher temperature inside the greenhouse?

• Have you considered how the planting shelves are oriented inside the greenhouse? What position will give them maximum sun? Commented Dec 3, 2017 at 14:14
• @SolarMike in my mind shelves (or the lines of cantilevered plants) are parallel the longest side of the greenhouse, this for work convenience. And in my mind this parameter is fixed, thus when I say "shelf orientation" I automatically mean the whole greenhouse orientation. If with "maximum sun" you are talking about sun exposure, this is a part of my question. Anyway, I may have to precise what sun effects mean: temperature reached within the greenhouse or the exposure for plants? I think both aspects go hand-in-hand. Commented Dec 3, 2017 at 14:22
• So, what sunshine data are you using? From your latitude and any objects causing shade this should be easy... Commented Dec 3, 2017 at 15:20
• I am starting from a blank paper (excel sheet), please explain what do you mean. Commented Dec 3, 2017 at 16:16
• You should start by finding out where the sun is in the sky each month. Commented Dec 3, 2017 at 16:25