of transport or buildings. Buildings, okay. So what does that mean? So when I was presenting this model in the US Senate last February somebody suggested to pull the lever and one of the senators said what does that mean? So what does that mean? What is electrification of the building sector? So how do buildings use energy? Heating and cooling is the dominant. We also have lighting, we have hot water and you run your appliances in an office setting like here you've got copy machines and so forth in your home you've got your refrigerator and your other appliances. But the dominant use is heating and cooling and in the northern latitudes where many people live it's dominant heating in the tropical latitudes it's dominant cooling. So what electrification means is well give you the example of my home. My own home here in Lexington, Massachusetts 90-year-old structure and four years ago my wife and I did a deep energy retrofit on our house. This entailed a lot more insulation so more energy efficiency than you haven't pulled that lever much yet. High-quality windows lots of insulation tight in the building envelope I can say more about this later but it included we ripped out the natural gas that was the heating system and provided the hot water and we went with air source heat pumps. So air source heat pumps we could have done ground source heat pumps that's geothermal. What that does is it extracts most of the energy you need for heating in the winter or cooling in the summer from the outside air using a heat pump a compressor and that gives you about three units of energy, joules or BTUs in the United States for every one of electrical energy you put in. So it's dramatically more efficient that's what electrification is. Okay and so let's try that did I do it? Yes I did it it it made a pretty good difference there pulling that one notch. Terrific!