Help Heat Homes with Ecogain : A woman who declares that she is passionate about saving energy describes the action of Anglian Ecogain glass windows. She uses animated arrows to show how ordinary windows reflect some of the incident heat back out of the house, and how Ecogain windows retain the heat and help lower heating bills. She adds that Anglian offer a £2000 trade-in to customers upgrading to Ecogain, as they can recycle the old windows; the ones that were specifically bought 10 years earlier with reflective glass to reduce the retained heat.