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I'm an evangelist for both (within reason).
Robovac is really good for regular cleaning. We do the kitchen floor most nights for instance. You'll still need to go round with a regular vac or a duster every so often though to get the bits it can't reach. They also need the floor clear to do a decent job. Wires, shoelaces, small toys and stuff are all bad news.
I'm in a victorian end of terrace that doesn't get that warm during the winter. Using a dehumidifier gets heavy clothes dry overnight rather than in a few days (and obviously also cuts down on the moisture). If you're in a warm house with decent ventilation it may not be as worth it.
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Heat pump tumble dryer is more efficient and quicker than a dehumidifier for drying clothes plus you have the added benefit of not losing a room just for drying.
Initial outlay is a fair bit more so not sure how they'd balance out cost wise over the long term but as someone who used dehumidifiers to dry clothes I'd never go back after getting a heat pump dryer.
Did either you or @hippy end up buying a robovac thingy? I'm also considering it but don't really want to spend Megabucks so the eufy ones are a consideration.
Alternatively I might spend on a dehumidifier for clothes drying but I'm not convinced either are going to make a huge difference to either a); getting the hoover out b) drying clothes on a rack near the radiator.
Are there any evangelists for either robovacs or laundry drying dehumidifiers to help me make up my mind?