Laptop helps keeping my hands warm during the winter. I can always clog the laptop vents and open some high CPU/GPU demanding processes on the background to increase temperature to keep my hands warm when weather outside gets under -20 C. This can be also very helpful before starting to watch porn to prevent cold handed masturbation... Continuously re-charging my dumbphones keeps the adapters and phones warm to add comforting warmth to rooms.
I also have my electric kettle on a heavy use at times, which leaks warmth to the house and turning lights on also helps bringing some extra comfort heating. Cooking something in the oven has been also proven as pretty efficient way to bring some warmth inside. Then I of course have this refrigerator/freezer combination where compensator builds up heat inside that little cupboard above the refrigerator. Opening the door of that cupboard can be used to temporarily bring in some extra heat inside to house when warmth spreads over the room. Oh, and that vacuum cleaner will make you sweat in no time by just standing nearby when it's turned on. Downside is that huge noise makes this method pretty unfavorable for heating.
Then I also have window blinds, which can be used to control and reflect the sunbeam when used properly, to bring in some natural warmth to keep the room warm. My own body warmth also helps keeping me warm when I sit on my computer chair, warmth from my butt enters to the chair and then further keeps my ass warm by reflecting that warmth back to my arse. That's the way to put all the idle energy from sitting to the use for maximum effect.
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Then last, but not the least. The very mighty sauna stove will keep sauna and even shower room warm if door is kept open. Hot water from the shower can also warm the air momentarily inside the bathroom for add some extra comfort heating besides bathroom lights...
lasma: