Part of the whole ROI equation is implicitly connected with how much energy conservation mods one has already done. The quick ROI stuff will benefit you no matter how green your home already is. The longer ROIs usually depend on how much effort you have already made to make your home conserve energy.
For instance, if the walls in your home are, ex windows, at R10 on average, then it wouldn't make economic sense to put in energy conserving shades. Maybe even LEDs wouldn't be the greatest investment then. However if you have already gotten to the point where all areas have the recommended insulation values for attic and floors/crawl space for your area and air sealed everything tightly, then it makes economic sense to get LEDs and energy conserving shades.
Thats why the quick ROI stuff is so important. They are easy and they ALWAYS make economic sense. There seems to be an order in which we are meant to accomplish things, even if we don't always do it that way.
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