WORD LIST:  air conditioning, arc, copper, damper, drawing, drywall, ductwork, floor joist, flue pipe, furnace, hammer, heat, insulation, nails, offset, pliers, rectangle, register, return, roof jack, round, sawzall, screwdriver, sheet metal, snips, solar energy, square, stainless steel, supply, thermostat, tinner, toolbox, triangle