Peter Garrett has opened Bradford Insulation's new Brisbane plant and launched the national register of insulation providers, kick-starting the main phase of the government's $4 billion Energy Efficient Homes Package.

All installers on the register are required to hold minimum skills and competencies and their work must comply with Australian standards. More than 3,000 businesses are already on the register.

"If the total cost of installation is less that $1,600, homeowners will have no more to pay because the registered insulation installer will claim the assistance directly from the government," Garrett said.

There is also insulation assistance of up to $1,000 available for renters and landlords. It is expected that approximately 2.9 million households across the country will take advantage of these offers.

The Energy Efficient Homes Package also provides a rebate of $1,600 to help eligible homeowners, landlords or tenants replace their electric storage hot water systems with solar or heat pump hot water systems.