On a perhaps pedantic note. Why does energy used never include the sun directly? In the summer we use less heat because the sun is giving us the energy instea

On a perhaps pedantic note. Why does energy used never include the sun directly? In the summer we use less heat because the sun is giving us the energy instead. So maybe we should be counting the heating we don't use during the summer as renewable heat instead. I suppose this would help account for efficiency also. If a house is deemed to need X kWh to heat a year. The difference between the gas used can be used to derive a figure for the 'renewable' energy used, whether from renewable electricity, solar heat, or negawatts.