> low-e glass windows > South-facing windows are backed by local stone floors that capture and radiate heat in winter.

Have you done any analysis or testing on low-e vs normal glass windows in the wintertime? In summer, obviously you want the low-e glass to block the radiant energy. But in the winter, you'd want to allow that radiant energy through, which the low-e glass is not doing.

It seems like low-e glass is only good for summer, and not winter. Have you put any thought into this? Maybe I am missing something crucial about the situation though.