Mr Little criticised the Government for taking a dividend from Housing New Zealand ($636 million over seven years compared with Labour's $281m) when it could be using the money so spend more doing up its houses.
Mr Key said he would take Mr Little more seriously if Labour had not suspended maintenance on houses when it was in Government in order to build more houses.
He said National had insulated 280,000 cold damp homes, 48,000 of which were state houses, it had spent $30 million providing heating at 10,000 properties and had installed thermal curtains at 17,000 house since 2013.
Mr Little: How can a man who grew up in a state house be OK with making a profit off our poorest families while they live in conditions that are killing their kids and making them seriously ill?
Mr Key: The Government does not make a profit out of Housing New Zealand. It spends $700 million on income-related rents. It spends $300 million maintaining them...Labour let those houses run down, it let those tenants get sick, and now in Opposition it wants to pass the buck to someone else. It is a disgrace, Mr Little.