Government grants have been targeted at landlords with rental properties occupied by low-income tenants since mid-2016, and Ms Collins said landlords should act promptly to get a grant.
"Landlords must insulate their rental properties by July 1, 2019 so I would advise them to get in quick and secure a grant while these are available. It's a case of first in, first served."
Over the past eight years about 300,000 homes had been insulated through the Warm Up New Zealand insulation programmes- Heat Smart And Healthy Homes.
The programme was due to end in June 2016 but Budget 2016 allocated $18 million to extend the Warm Up New Zealand programme for a further two years until the end of June 2018.
"Analysis shows the avoided health costs to New Zealand from insulating a house are on average $854 a year for Community Services Card holders."
The Energy Efficiency and Conservation Authority runs the Warm Up New Zealand: Healthy Homes programme - find details at www.energywise.govt.nz.