Ask a home inspector you are considering if he'll do a blower door test. If he doesn't know what that is, find someone else. This has come up before. A blower door test measures the amount of air exhausted from a house needed to depressurize the house to a standard 50 pascals difference. It's a measure of how tight the house is. A leaky house could be very uncomfortable in winter and cost a small fortune to heat. Major air leaks can be identified this way, many of which are fairly easy to seal up.
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