In theory, air is a good insulator, if it can be kept from moving. Experts believed that the 4" of "dead" air space captured inside the stud cavities of your walls, combined with a vapor barrier, was enough to keep heat inside your home. Conserving energy was just not very important. Half of the world's oil was produced in the U.S. That's because when your house was built a half-century or more ago, no one thought much about insulation. Is your old house drafty in winter, swampy in summer? Almost impossible to heat and cool effectively?
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