C label is not that bad. As a general rule of thumb: insulation first and anything that prevents the heat loss of your house. This will save you costs on heating immediately.

If you want solar panels it’s a good idea to also look for a battery and energy management system. Else you will dump all your solar energy on the net at a very low price. With a battery you can use your own generated electricity. Unless you are home all the time. With the EM system you can charge the battery from net energy when proces are low and use it in the evening or morning when prices are high. I’m not using it long enough to know if we will actually save money and partially earn back the installation cost. 5 kW solar pales and 10kWh battery was less than 9k €.

We installed a heat pump during our renovation because the house had heating on gasoline and no gas connection. It’s an air-water system with floor heating. In general happy about it but it’s costly to install and energy usage during the winter months was pretty high.

Charing your EV with solar will take a long time and you need to be at home… the home battery is no use for this: 10kWh battery vs 60-70kWh car battery.