Insulation for garage

[georgelee]

I am not sure to ask my question here in DIY topics (Apologies for this) but want to ask something related my garage. I am not a professional mechanic but my most of time spend in garage for the reason of my love with ATV. There (At garage), too much cool air passed from the door side even if the door remains close. I'm get tired for continuous use of electrical heaters because they did not work as much as like they have to. I really want to save my bill by minimize the electrical consumption. In this regard, I did a lot of research on Insulations for home and the most effective types of insulation that should work for both heat and cold. I also get through home insulation FAQs but for now not sure to have this solution for my garage or not. Any suggestions?

[SpongeBob]

Greetings all! I found out about the dew point that, as many people mentioned, would accumulate condensation between the wall and insulation. However, the dew point is fluctuant and can vary under different conditions (e.g. temperature, humidity, pressure). This is why the condensation would be formed if only the dew point reached the space between the wall and insulation, but, I think, only for a short time. Please, help me sort out this issue. I would prefer Penoplex for insulation over the foam plastic (which I wanted to choose first) to protect it from an invasion of mice.