EECA team manager of residential projects Jenny Lackey said Auckland's low uptake was because it was a large metropolitan area with a large number of houses, while Marlborough and the West Coast also had fewer insulations because of their large geographical areas and small populations making it harder to reach. These areas had not attracted as much third party funding as other regions such as Gisborne where more than a quarter of homes had been insulated.
Eastland Community Trust general manager Leighton Evans, whose organisation had provided more than $4 million in funding to low-income households in Gisborne, said the main advantages had been to people's health as there had not been a noticeable reduction in the power bills.
Mr Evans said the cost savings could not be seen because residents were now heating their entire houses rather than just the main living room. Research into the benefits of the programme found that for every $1 spent on insulating homes there were $5 of benefits and 99 per cent of the total benefits from the scheme were health related.
Marlborough District Council - one of the regions with the lowest uptake - struggled to pinpoint why it lagged behind the rest of the country.
Mangere Budgeting and Family Support Services chief executive Darryl Evans said a lot of his clients' landlords refused to take advantage of the scheme which he found baffling.
"Uninsulated homes is a major problem for our families as the houses out here are more often than not, cold, damp and miserable.
"Many of our families report the kids are often sick with respiratory illness, which includes coughs, colds and pneumonia. As a result many turn on all the heaters to try and combat cold and as a result they end up with large unmanageable power-bills. Others don't turn the heaters on and so get sick quite often."
Mr Evans said some families had even put bubble wrap on the windows.
But Property Investors Federation president Andrew King disagreed and said a recent survey found 5300 rental properties were well insulated. Mr King said most of the properties had been insulated before the scheme was introduced and felt since 2009 providers were charging well above the store price.