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" ... 9. Add weatherstripping. Weatherstripping applied around the frames of windows and doors helps boost winter warmth and cut energy costs. Add door sweeps to the base of drafty doors to keep heat in and cold air out. ... "
" ... Conventional ways to save energy are actually the world’s largest energy “source” today. Millions of small improvements over the past few decades—insulation, weatherstripping, better motors and engines, recovering waste heat, more-frugal chemical reactions, all the myriad fruits of careful engineering—add up to efficiency gains that now provide more global energy services than oil or any other fuel. Of the vast energy savings so far in producing each dollar of GDP, roughly two-thirds came from smarter technologies, one-third from shifts in the composition of economic output and in human behavior. ... "