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They just cost what they consume. Major upside of the desiccant type is they output that heat into the room, super efficient if you do the science on it. So in a hot country yes extra heat is not what you want, but in the UK you just run them and offset it against your heating.
If you fire one in a room with a TRV controlled radiator your costs will be the same during heating season, if not a tad less as you are not heating the moisture suspended in the air.
If its just me in, I'll use a dehumidifier on in one room and close the door, 300w for a small/medium room is enough to keep me from being cold.
BrickMan-
So in a hot country yes extra heat is not what you want, but in the UK you just run them and offset it against your heating.
This is what I thought, but then I wondered if using gas to heat the room + compressor type dehumidifier would be less expensive as gas heating is an order of magnitude cheaper than electric?
FWIW I have two desiccant dehumidifiers and am shitting it on our 'leccy bill.
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From the blog:
Both compressor dehumidifiers extract more water at 15°C than a desiccant dehumidifiers and using around a third of the energy.
So I guess that's whether you want that wasted energy as heat. Personally I either have the dehumidifier in a hallway so the heat is pretty ineffectual or in a spare room with the door shut (often overnight) with laundry so I don't care about the temperature in there.
If you're dehumidifying the room that you are in then I guess it may make sense but is that common?
Howard
aggi
Meaco disagree with this now.
https://blog.meaco.com/why-desiccant-dehumidifiers-are-not-always-better-at-low-temperature/
I looked at dessicant but they cost a bomb to run. The Meaco ABC I have seems to be doing ok at ~ 16 degrees.