It is possible to have the doors open fully regardless of the temperature, as long as the temps are not too extreme. On my D, the coldest temperature I have had it out in was about 15-20 F. The doors opened fully to the highest point without any help on my part. However, I am very careful with them in the summer with temps approaching 100 F. The door opens what I would call quickly at high temps and I keep it from opening too quickly so as to not damage or bend the door hinges. If I were in your shoes, and keeping in mind the average temps in Norway, is to have the torsion bars adjusted on a day that is of average temperature for your climate. With this in mind, they should open fully without help most everyday of the year. It is totally up to you. Whatever you decide, best of luck to you. Regards, Darren Decker #5000