A rebuild from scratch is your perhaps one and only chance to do it right. Make the new structure superinsulated (aka "heats with a candle"). Even codes are getting more stringent on insulation levels, air sealing, and elimination of thermal bridges. But remember that a house just built to code is one that barely passes the test - the grade is a D-minus. Build to a better standard, and you'll be glad you did. It costs surprisingly little extra to build a better, more comfortable, more durable, and less expensive house to heat and cool. Most builders won't give you a house like this on their own. You have to specify just what you want, and that means you have to do your homework first. There is plenty of information online covering all of this.
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