As a first pit-stop I'd recommend: https://en.wikipedia.org/wiki/European_Union_energy_label https://en.wikipedia.org/wiki/European_Union_energy_label The 'sel

As a first pit-stop I'd recommend: https://en.wikipedia.org/wiki/European_Union_energy_label https://en.wikipedia.org/wiki/European_Union_energy_label The 'self installing geothermal' is probably Ground Source Heat Pump technology and is quite good. Whether or not you need to become an electrician will depend on your jurisdiction.