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In Canada, are options available to subsidize conversion of a house into an energy efficient house?
There may be more, but a good starting point would be the ecoENERGY Retrofit Grants and Incentives.  Natural Resources Canada's ecoENERGY Retrofit program provides financial support to implement energy-saving projects. There are different application processes for homes, commercial and institutional buildings and industrial facilities. Together we can reduce energy-related greenhouse gases and air pollution, leading to a cleaner environment for Canada. Also, there was a temporary home renovation tax credit about a year back, but that no longer exists and nothing has replaced it yet.