Dehumidifiers - can they help dry your washing faster??

[AvadaKedavra]

We have a small damp problem and have borrowed a dehum, it's been on all day today and collected lots of water, quite shocking really - but have just noticed that washing that is currently taking around 4 days to dry out on the airer is almost dry after just being put on last night! Am amazed! Seriously considering buying one of my own now just for this

Is this a universally known thing or have I stumbled upon something revolutionary? [imagines making a million out of this somehow...]

And can anyone recommend what to look for in buying a decent dehum for a one bedroomed flat - budget - as little as possible!

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The one we've borrowed makes about as much noise as a fan/fan heater/microwave when it's on. I couldn't sleep with it right next to my bed but out on the landing I couldn't hear it at all.

we keep ours in the landing cant say I`ve heard it but I am a bit hard of hearing :)

Can anyone recommend a dehumidifer? Are they easy to move about or do you have to keep them in the same place? Not sure what I'm supposed to be looking for but we have a damp 50's house with a 7 month old blw boy so washing is daily at the moment!
Was going to get a tumble dryer but Mumsnet has come up with the goods again and changed my fickle mind! - thank you for all your advice!!

Ours is a Challenge. I think it was from Argos, we have had it a few years. Not too expensive in the first place.