The lifetime credit limit is based on tax returns filed by you from tax year 2006 to the present. So the lifetime is your lifetime, not the lifetime of different homes you may have owned over the years.
Some of the 'energy' credits, such as the one for solar electric property, will allow the cost of installation to be considered for the calculation of the credit. The credit for making energy-saving improvements to your doors and windows does not allow you to include the installation cost. So, you may need to get that itemized bill to break it down.
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