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> The minimum house temperature your home should be kept at to avoid damp, mould and condensation is 18°C, according to health and energy experts.

That article and the supposed experts are idiotic. Condensation is a function of relative temperatures and humidities. If your house is warmer than outdoors, then you're not going to get condensation from outdoor air.

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The outdoor air isn't really relevant, the issue is human activity (breathing, showering, laundry, etc.) raising the indoor humidity when combined with low indoor temperatures causing surfaces to approach the dew point. Particularly external walls or windows that will be a lower temperature than the room as a whole.

At 70% RH and 15C air temperatures, the dew point is 10C - which could easily be achieved along the exterior walls of an older more poorly insulated house.

If only there were some way to circulate expired air out of a building, perhaps with open windows...

My house is bone dry in winter with the windows regularly open. The humidity concern is idiotic.

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