My local electric company will come and do a free inspection of your home to show you where inefficiences are. A coworker had one done to her home and other than the obvious things, like light bulbs and insulation, it was very minor and inexpensive things that made a difference. Caullking and weather stripping are both cheap, and even window coverings make a difference.
Also all those mini-fridges and other appliances can be a fire hazard, so that may be another good reason to limit them.
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