one thing i didnt see asked was if this house is paid for or if payments are still being made on it. if it is paid for - it makes more sense to stay where you are and invest in "upgrading" to a more energy efficient status. building a green home will save money in the long run, but is not so inexpensive to build to begin with. also, selling and moving to another home, depending on your area valuse might put you in a position where (if your current home is paid off already) you are paying more out in house payments than you would be saving in efficency. Money that you could have put into upgrading the current house. also, the money invested in the home you are in now will bring a return as "green upgrades" if you should decide to give in and sell later.
oh something else - a lighter color roof tile will help with your cooling in the summer - dont know if a new roof is in your immediate future or not, but its another thing to think about when the time comes.
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