MVHR indoor humidity
What MVHR does to indoor vapour, what it does not do to rising damp and leaks, and why Qordac has no invented plant partners.
Updated 2026-09-01 · 7 min read
MVHR changes air continuously. It cuts indoor vapour in tight envelopes. It does not dry a wall wet from below, and it is not a gadget to buy after an article.
For a studio with wet glass, the sequence stays: measure, air, maybe an extractor, maybe a dehumidifier. MVHR belongs in a project, not a shopping cart.
First check whether this is indoor vapourNo. There are no partners. If a lead channel is connected later, it will be labelled — no fake lists.
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10–25 €
Without a relative-humidity number, every tip is guesswork. A €10–25 hygrometer is the first useful purchase — before any dehumidifier.
When: Always, as the first diagnostic step.
Not when: It does not replace a moisture meter or a rising-damp survey.
Affiliate link not connected — a category, not a model review.
40–180 €
In a windowless bathroom this often beats a portable dehumidifier: it removes vapour at the source.
When: Bathroom mould, daily showers, poor air change.
Not when: It will not fix a thermal bridge in a bedroom.
Affiliate link not connected — a category, not a model review.
D.M. 26 giugno 2015 (Italia)
Criteri nazionali di prestazione energetica; rinvia alla verifica di condensa e muffa secondo la normativa tecnica.
Accessed 2026-09-01
CIBSE Guide A — Environmental design
Intervalli di comfort di umidità relativa per ambienti abitati, usati come riferimento di progetto, non come obbligo di legge.
Accessed 2026-09-01
Dehumidifier, extractor or MVHR: what you actually need
A method comparison, not a brand roundup: when to extract vapour at source, when to dry room air, when continuous ventilation is the job. No model rankings.
How to air a house in winter without wasting heat
Why a tilted window all day both cools and humidifies, and why three minutes fully open works better.
Mould in a windowless bathroom: extractor before dehumidifier
Why a portable unit in the lounge will not fix black silicone, and how to spec an extractor with a humidistat.