What are your techniques. Do you mind sharing to us young Pediwans?
Living in southern Ca helps a lot as our weather is pretty mild here. Every garage is different, depending on the amount of sun, size, insulation, height construction and other factors. My garages were and are some what insulated and situated in such a way I don’t get huge temperature increases in the summer. They do get cold in the winter however. Some years are worse that others. I have storage in another garage that gets colder in winter and much hotter (110 degrees) in the summer. The cost of keeping a tank there would be much higher at best.
All my garage tanks were insulated, some more than others. For a while I had 3 60 gallon tanks stacked one above the other. The one end and half the back had 2” of pink insulating foam enclosing them year round. When it got cold I would enclose the rest of the back and other side with 1” of pink foam. The front of the tanks would be closed with a 4x6’ sheet of the same pink styrofoam on colder nights. So in winter I had a big 4x2x6’ pink box in the garage. In summer a fan on a controller was all I needed to keep the temp in check.