More goes into a house or building than insulating it. There is structural. The building needs to stand. You can’t really make it like a cup and expect it to be sturdy.
But honestly. If your building a home to code, it’s most likely better than that cup. Some homes will only loose a few degrees in 8 hours. A yetti,while keeping the liquid warm, will keep it warm for 4 hours. That’s pretty good for a cup of coffee, but it’s got nothing on a well insulated home. Even in an older home that looses 1 degree per hour, in 10 hours you only lost 10 degrees.
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