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It seems obvious that when a homeowner replaces an old appliance or fixture with a more efficient model, it is always a good thing. Surprisingly, it is not so clear-cut. A number of studies have found that some kinds of residential energy efficiency retrofits not only do not result in significantly less power usage but end up increasing power usage. The positive news is that many utilities are offering solutions to address this challenge by using disaggregation tools to offer homeowners information as to why their energy bill increases rather than drops.