Diagnosis: name the damp before you buy
Most wasted spend in this niche starts with a skipped diagnosis. A dehumidifier, anti-mould paint or a salt tub treat different physics.
This cluster is the method: watch where the problem appears, measure relative humidity, estimate dew point, and only then choose a fix.
Guides
Damp at home: diagnose it before you buy anything
A step-by-step way to tell condensation, indoor vapour, rising damp and leaks apart. What to measure, what to watch, when not to buy a dehumidifier.
Rising damp: how to recognise it (and what not to buy)
Stains from the skirting, salts, crumbling plaster. How to tell it from condensation and when you need a surveyor.
Hygrometer: how to use it (and why it is the first purchase)
Where to put it, what error to expect from a cheap unit, how to keep a small log.
Active electro-osmosis: costs, when it helps, alternatives
What active electro-osmosis is, when it belongs with rising damp, and when it does not. No price list: the factors that move a quote.
How to measure humidity at home and in walls (limit values)
Air relative humidity and moisture in the wall are not the same number. The EN ISO 13788 mould threshold (about 80% at the surface) and how to use a hygrometer and a moisture meter.