On Nov 11, 1:22*pm, Lobster wrote:
Clive wrote:
Basically I'm taking a £100 gamble on the dehumidifier to improve the
situation for the tenant and I can't make the situation worse.

Agreed; though the problem with buying a humidifier for a tenant is that
* once they realise how much they cost to run they tend not to want to
know; furthermore unless you get a model with a permanant drain they
don't work once their reservoir gets full and need emptying...

David

You could fit a vent fan (replaces internal damp air with dryer
outside air but with a heat exchanger to the heat stays inside)
through the wall. vent axia make them IIRC. They can be set to be
permamently on 'low' thus keeping humidity at bay but not losing heat
(becuase of the heat exchanger.

Robert