Sounds like the room is / was quite cold? Putting some heat in to it will persuade the walls to let more of it go.
Yep :) Had a heater running in there 24/7 as well - worked out the cost in electricity the other day. eye-watering.
@Quincy started
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Sounds like the room is / was quite cold? Putting some heat in to it will persuade the walls to let more of it go.