Average annual electricity use of common home appliances from the EIA's Residential Energy Consumption Survey, how to turn watts into kWh and cost, and how to measure your own appliances.
C-wire requirements for Nest, ecobee, Amazon, Honeywell Home and Sensi smart thermostats, how to check for a spare wire, and which maker adapters work when there is none.
How much smart thermostats really save, why maker claims run higher than ENERGY STAR's average, the setback settings ENERGY STAR suggests, and the heat-pump exception.