We performed a payback period analysis on options to make a house more energy efficient. We examined photovoltaics, appliances, solar hot water, geothermal heat, windows, and insulation to determine which versions of each was the most efficient and cost effective for an average Massachusetts home. We found that the majority of these technologies are feasible. The exceptions to this are Icynene insulation and photovoltaic panels which require additional subsidies in order to become affordable in residential building.
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