In a typical year, this house needs 14,725kWh for space heating and 2,081kWh for hot water. In a particularly cold (1 in 20) year, it might be 14% higher. Space heating and hot water requirements are evaluated annually as well for a typical day in each month of the year, also covering electricity requirements for air and ground source setups with standard, oversize radiators and underfloor heating. Analysis is derivied using hourly weather data for the property's exact location going back to 1940 covering air temperature, soil temperature, wind and air pressure. For the heat pump options, where the efficiency of the appliance is also weather dependent this means that the projections are internally consistent.