The Government is forcing landlords to insulate rental properties.
It says changes to housing regulations will make rental homes drier and safe, but a third of cold houses will be exempt and rents are likely to increase.
There's an urgent need to act. Last month two state house deaths were revealed. Toddler Emma-Lita Bourne and 37-year-old Soesa Tovo both battled pneumonia and both lived in cold, damp houses.
There are 280,000 rentals which need insulating, but only two thirds will be - 100,000 simply cannot and that is because of the way they're built.
Watch the video for Tova O'Brien's full report.