Quote:
Originally Posted by CateP
So in an older house (that has stood the test of time), if previous owners have updated the major systems (electric, plumbing ) and replaced windows and the roof, what really is the big difference?
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Many houses built in the 80's or earlier used 2x4 wood framing, so only 3" of insulation can be in the walls. From mid-80's on, most houses used 2x6 framing, and have five inches of insulation. All other things equal, that makes a big difference in how much heat escapes. Of course, today, foam insulation may be used instead of fiberglass, and provide even a tighter cage for the heat.