A full assessment of your home is in order. Many utilities do this for free and it will give you the "low hanging" fruit that is easy to do and will return the most money.
Replacement windows are obviously one of those early steps.
Before putting $ in PV panels, do the simple and boring insulation and infiltration upgrades. They return FAR more $ than a PV system.
For example, how much insulation is in the attic? Have your utility do a blower door test to determine infiltration and check if the work you have already done is adequate.
Great looking house!
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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