There are shades of green. Some “green” buildings may simply have a couple of efficiency improvements that don’t make a huge difference and thus its efficiency is similar to that of a non-green building. Other buildings might have massive efficiency improvements and in fact may live entirely off the grid if solar panels are installed. In general, older buildings will have old, inefficient insulation and appliances. Newer buildings built with the intent of being sustainable will have substantial efficiency improvements over these older ones.
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