air the house in winter
Why a tilted window all day both cools and humidifies, and why three minutes fully open works better.
Updated 2026-09-01 · 6 min read
In winter you need air change, not a crack for eight hours. Moist air from laundry and showers has to leave; walls should not cool to dew point.
Usually not: it chills reveals and glass and changes little air. Short, full openings work better.
en
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10–25 €
Example desktop hygrometer for diagnosis. Without a relative-humidity number every tip is guesswork. Not a lab review.
When: Always, as the first diagnostic step.
Not when: It does not replace a moisture meter or a rising-damp survey.
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50–110 €
CO₂ monitor to see whether short winter airing is enough. It measures, it does not purify. Not a dehumidifier and not a mould detector.
When: You air little in winter and want a number, not a “stuffy air” feeling.
Not when: It does not replace full window bursts, an extractor, or a surveyor if the fabric is wet.
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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
Window condensation: when it is normal and when it is a warning
Why glass runs with water, how to use dew point, and what changes between single glazing, double glazing and a cold reveal.
Indoor laundry: how much moisture it adds (and what to do)
A full wash can put litres of water into the air. When to air, when to dehumidify, when to move the rack.
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.
MVHR and humidity: when it belongs (and when it is another project)
What MVHR does to indoor vapour, what it does not do to rising damp and leaks, and why Qordac has no invented plant partners.