insulated grow box

Hi all, brand new here and building 1st setup. Using a metal 2 door stationary cabinet. Need advice on if the cab needs to be stored inside home or can be in a garage (cold) also want to know if using foam foilboard to insulate inside of cab + panda white is going to be better or worse for...

Growing in cool temperatures is a problem for many, but I haven't seen much to deal with it. I have some ideas and hope others can contribute. I'd like to make a grow box of foil faced foam insulation. I'm hoping to get by with minimal air exchange to keep the heat and humidity inside, but have...