Here are three no one else has mentioned yet:
Don't run the water while brushing teeth, rinsing dishes, etc. If your dishwasher won't clean the dishes well enough without prerinsing, fill your sink with just a couple of inches of water to rinse everything in before it goes in the machine.
Or you can use the industrial method of low-water hand-washing by setting up three dishpans of shallow water, adding soap to the first and a small amount of Chlorox to the third. Scrape the dishes well, soap, rinse in the second, dip in the third and airdry on a rack.
Second, dress for the seasons. I'm amazed at the people I see wearing long pants and flannel pajamas in the summer with their AC turned way up, and short-sleeves inside in the winter. Wearing long underwear, turtlenecks and the like inside will allow you to keep that thermostat set appropriately in January. (If you need mittens and jackets inside, you may be overdoing it.)
Third, not the easiest but very effective--move to a smaller place. We have a mindset that bigger is better and that everyone needs their own room, even the cat. I recently moved from 4,000 sf to 1,000 (not by choice at first), and there's not one thing I miss (except my yard). Next move will be to an even smaller place. Think hard about how much of your space you actually use. If you rent, there's no harm trying the smallest size you think will be comfortable and then moving up or down from there. If you're stuck in a really big place, you can close off some rooms, close the vents, windows and so forth, or even rent out space to someone else. Not only will you use less energy in heating, cooling and lighting, but you'll be able to recycle some of your excess furniture, saving in the energy costs of buying new ones for the next person, you'll use fewer cleaning products, you'll save time spent taking care of the space and the possessions filling it, and you'll get to know your family better.
I don't own a dryer, but hang clothes to drip dry on folding racks or on hangers on the shower curtain rod.
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