Cheapest to run and most eco friendly types of home water and room heating systems?

Question by Shane N: Cheapest to run and most eco friendly types of home water and room heating systems?
I am moving into a house along with family that my father built.What would be the ideal form of heating systems?Electric?Geothermal?Are there other eco-friendly types?
I dont have a heating system yet as its for a house my dad built with the heating and electrical wiring being set up

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