The Australian Federal government are billing it is as the” largest-ever energy efficiency rollout” in the country. It’s their $4 billion Energy Efficient Homes Package designed to get ceiling insulation into the roofs of 2.9 million Australian homes, by 2012. Even in sunny Australia winter heat loss and summer heat gain through a residential ceiling is calculated to be between 25% and 35%, so there may be some truth in the government’s hyperbole.

As you might expect, given that they are giving home owner-occupiers a $1,600 AUD insulation rebate and $1,000 to landlords or tenants for rental propert…