Gas-based energy system with no renewables used.
This house is using a hybrid energy system with heat pumps, solar energy and gas boilers intelligently at the same time. The heat pumps extract thermal energy from the air or ground and use it to heat the house. The solar panels convert sunlight into electrical energy which is used to power the heat pumps. The gas boilers are used as a backup when the other two sources are not available. This system is very efficient and environmentally friendly. It is also very cost-effective in the long run.