Spray foam insulation kits are relatively inexpensive, and easy to use. They are self contained, and do not need the use of power sources to apply the insulation. Included in most all kits will be several feet of polyurethane spray hose for ease in moving around, a dispenser gun, a regulator to keep the flow consistent, an output fan for blowing the insulation and calibration tips for the gun. You assemble as instructed, and spray the insulation into the areas that you want to insulate. The kit can be reused if you properly clean the kit after using, being certain that you do not allow the insulation to dry on the parts. You just need to buy more insulation.