Is it a false economy to turn off radiators in rooms we don’t use?

Every week a Guardian Money reader submits a question, and it’s up to you to help him or her out – a selection of the best answers will appear in next Saturday’s paper.

This week’s question:

We live in a big old Victorian house, but on a low income. We turn radiators off in rooms we don’t use. Now a friend says it’s a false economy, risking damp and making the whole house cold. Should we turn them back on, or do you have any other tips?

Do you have a problem readers could solve? Email your suggestions to money@theguardian.com or write to us at Money, The Guardian, Kings Place, 90 York Way, London N1 9GU.