After using your oven in the winter, turn it off and leave the door open so the leftover heat can spread into your home. Of course you need to keep small children away until it cools, but when it comes to conserving energy and money every little bit sure adds up.
Here's some other related ideas. Let your dishwasher air dry, and let that hot air out in the cool months; if you can crack the door vs. fold it all of the way out, that's much safer (in the hotter months, run it overnight!). In addition, if you have stoneware, that gets extremely hot, I found. Use a heat mitt to take those out of the dishwasher and they radiate heat like crazy.
I do this too, plus after I use a stove burner (electric), I put my full tea kettle on it. The heat left warms the water, allowing that warmth to radiate from the kettle.
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