Your Home, Estimated - Fermi problems and a home energy audit

Before you start. This lesson uses the others on this shelf, one idea each. From The Socket Is a Waterfall - volts, amps, watts and the bill: watts are joules per second, and the bill counts kilowatt-hours, watts times hours over a thousand. From Cold Is a Lie - fridge, AC, heat pump: a heat pump moves heat for a fraction of the electricity a heater needs to make it. From Why a Fan Cools You, Not the Room - evaporation & boundary layers: a fan cools you, not the room, and lets an air conditioner run warmer. From Twice the Speed, Four Times the Stop - braking, crumple zones and seatbelts: a moving car carries energy that braking turns into heat. Nothing else is assumed.