We have a wooden house from 1909, insulated, but not to modern standards and many windows. The heating and hot water is provided via a 10 kW (out) modern heat pump with a 100 meter borehole into the ground. This is a fairly standard installation in Sweden. It provides all the heat needed, except for extremely cold days (-20c or lower) when a 7 kW immersion heater can provide support. This is not needed more than a few days a year where we are.

We have added a small solar installation (7kWp) and a battery pack (18kWh). It provides 90% of power needed in the summer and allows for decent peak shaving in the winter, to lower network costs.

Additionally we are Co-owners in a windpower cooperative that provides more than our share of electricity into the network. So we are essentially operating our home on wind and solar, as well as powering the electric car.

Better insulation makes cost savings sense regardless of what type of energy is used for heat