Beyond technical feasibility, climate policy has one big elephant in the room: the financing of measures. Often the money is not available for both - the installation of a heat pump and comprehensive energy refurbishment. So moving away from fossil fuels means switching to heat pumps first, including larger radiators to reduce the flow temperature and improving the control of the system. 15,000 kWh of natural gas that way affordable can be converted into 3,200 kWh of electricity.