Act on CO2 says that the key to being green and reducing one's carbon footprint is making simple changes at home.

It claims that people can save money and energy at the same time by changing their attitudes and making adjustments to their property, the Journal has reported.

One of the organisation's top tips is attic insulation. It claims that around half of a home's heat loss escapes through the roof and the walls, so insulation can dramatically reduce this loss.

However, the insulation added to the attic must also be of adequate thickness. Act on CO2 recommends homeowners have insulation that is 270 mm thick.

Global Home Improvements claims that many Irish houses, particularly those built before 1980, are very wasteful of energy - so anyone who owns a home that was built prior to this may benefit the most from attic insulation.