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As I mention in my post, at present we no longer have the problem the humidity levels were 60,+ with the PIV system currently it is 50° with the dehumidifier in operation on low setting. Perhaps the PIV was actually introducing humid air being as the outside readings were higher than inside.

Condensing dryer.That is not a cause as we were away from the house for two weeks in January the central heating was left to run as normal and the PIV was in operation. On our return to the house at 09:30 there was considerable condensation present.

The problem

We have a detached bungalow with loft conversion which has been suffering from condensation and had a PIV system installed which included a roof vent for the air intake as the reduced loft space due to the loft conversion was deemed to be inadequate,diffusers were installed on the upstairs...