On Feb 28, 1:31*am, krw wrote:
Bull****. *In the winter here it's almost always below freezing at
night and *rarely* below freezing during the day. *That has *nothing*
to do with the interior humidity.

With *HIGH AIR CHANGES PER HOUR* the OUTSIDE humidity will
DIRECTLY affect INTERIOR humidity if there is *INSUFFICIENT* heating.

UK house with ACH 5+ from 8-12 vents and 2 gas fire open flue chimney:
- 2 open flue chimney draught SUCK in damp air ALL OVER THE HOUSE.
- Humidity in the 2 gas fire heated rooms is LOW, temps 21oC.
- Humidity in the UNHEATED rest of house is HIGH, temps 16-12oC.

UK houses with LIMITED heating and HIGH 5+ ACH are *DAMP*.

UK houses with WHOLE-HOUSE heating are NOT damp.
UK houses with WHOLE-HOUSE heating CAN become damp if people dry wet
washing on radiators and stuff up every vent to reduce ACH 1 in order
to reduce energy - instead of fixing the non-existent insulation.