Heat always moves from Hot to Cold. When we "COOL" down, we are in reality we are removing heat. (heat transfer). A refrigerated trailer out in direct sun light has to fight off this heat. Once something is heated (an outside of a car or refrigerated trailer) it then conducts heat through every material it touches. This heat is convection heat. That is the heat we need to stop to keep "COOL".
How do we keep everything "COOL"? We insulate ourselves or our product from the heat "convection". We use materials as heat shields. Fiberglass insulation in a house, Foam insulation to a refrigerated trailer. The thicker the shield the better. Ask us how we insulated our trailers to stop the Heat and stay "COOL".