 Operation of houses, so energy is needed, cooling and we do have a very typical distribution of the demand of energy and that would be that we have the lion's share is going into heating or cooling and after that there is water heating for showers for taking a bath and then it's lighting and fridges, freezers a lot less cooking and well standby power is this issue is addressed now so many units are now turning really off and then other applications are taking around 16% so almost 40% goes into heating and or cooling depending where you are but for the heating at least we can build passive houses that don't need heating anymore so we can get rid of this in cold climates but it's a lot more difficult to get rid of air conditioning in very warm climates especially in humid tropical climates because life without air conditioning there can be very uncomfortable depending very very much on humidity in the air so a humid 35 degrees is hard to bear but dry 35 is very pleasant and this is something where air conditioning is something that most people want to have but if the construction is made in a proper way you need a lot less energy for air conditioning than if it's just with single pane windows and losing a lot of the energy just to the outside