Or, you could consider PIV ventilation
I had to google that, and it set off my snake-oil alarm. Is it good, then?
No idea.
I was recommended it by a Damp Proofing expert who I had asked to check out the reason for the damp in my house. He concluded it was just 'living conditions' and nothing serious like wet walls, leaks etc.
The guy said he installs quite a lot of the units in older properties that suffer from bad condensation/damp.
I don't have £500 to spend, so plumped for the dehumidifier.
I also wasn't keen on blowing air from the loft (very cold) into the house - figured it would wreak havoc with heating bills over the winter, and I only have a condensation problem in the autumn/winter so it would be a waste of time for 8 months of the year.
Also, the PIV units are supposed to work by slightly pressurising the air in the house, thereby forcing the damp air out through vents and what not (and generally creating circulation).
My double glazing does not have trickle vents, and there is no venting in the house other than opening windows (which we don't much in winter due to the cold), therefore I figured the 'venting' theory may not work optimally.
So, no comments from experience, just my thought process. I might go back to the guy at sometime to discuss in more detail.