The Importance of Energy Efficiency Upgrades

In terms of retrofits, what are the main things we're talking about here? Make this very real life for people. The simple stuff is things like LED light bulbs and putting insulation on heating pipes that are currently exposed. There's a lot of new software and products for that kind of approach. And then there's big capital improvements like a much better boiler or furnace,. windows that are much better sealed, better insulation, better roofs, a better elevator.