A deep building retrofit can bring down energy use in a building by 50% to 80%, whereas a regular retrofit—when we're not thinking in terms of systems—is only 20% to 30%. If we focus on the method by which we'll do it, we can get those really deep reductions. That's how we're going to support populations, households and businesses in this energy transition, and concerns around any rising costs—for example, the inflation we're experiencing right now. That's a very protective aspect. It will also improve comfort and resilience for building occupants.
As I said, the technologies are out there. The innovation needs to be around business models that address labour, address investment and address convenience. A lot of these types of renovations are not convenient for people.