The two of us live in a small terrace at the moment (2 bedroom + converted loft, 4.3m x 7m on ground floor and first floor) and we try to stay low on energy usage. In February, we used around 240kW electricity + 425 kWh gas. We try to avoid heating, me and the Mrs gets skin irritation when the heating dries the air up. That's why a house that minimises heating need is going to be ideal for us.