If you are having a hard time working on your build in the summer heat, especially welding, here's a product that may help you. It's called a STACOOL vest and is classified as a BODY CORE COOLING SYSTEM. stacoolvest.com I have used one for several years when my work locations get over 80-85 degrees, especially when I'm welding in a hot environment. It uses what is commonly called a reverse thermal battery, a fancy name for a vest full of cold packs. There is a shield between the packs so the cold doesn't freeze burn your skin. This cold vest doesn't compromise my mobility. Mine lets me arc weld in 100-degree heat with protective gear for about 2-hours without hardly breaking a sweat. If I'm not welding and doing light work I can go about 3-hours. I have extra inter-changeable cold packs units and it takes about 4-minutes to change out with a fresh set. This one is priced right for the average guy. There are even more advanced units from Coolshirt technology, circulating cold liquid cooling and even freon cooled units if price is no option. vertigo