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A conference will be told later that improving poor housing in Wales could save the NHS £67 million a year.
The Chartered Institute of Environmental Health also says £1.5 billion is needed to tackle the problem, with half of that needed for upgrading cold homes.
The Welsh Government says it's investing £36 million this year to make homes in some of Wales's poorest communities more energy efficient.
They also say there's an additional capital investment of £70 million to tackle fuel poverty over the next two years.
The Welsh Government says it plans to invest millions in improving housing in some of Wales's poorest communities.
The statement comes ahead of a conference of the Chartered Institute of Environmental Health, which is expected to hear that action and advocacy on housing could save the NHS nearly £70 million a year.