We have just got our planning permission through in Cork and were looking into the option of combination system of geothermal and oil (upstairs), wood pellet or oil combined with solid fuel. However the main problems with geothermal is the installation cost (a crowd from Kerry were quoting somewhere in the range of around 18,000. Running costs about 800/900 pa - this is a lot of money. Alternatively, the wood pellet solution - I think it sounds good, however, you have to consider building a self contained room which must be drylined, that can store aprox 3 tonne (we have been told my Kerry crew that this bulk delivery is most cost efficient). I hate to admit that even though I'm very much from the school for eco friendly energy, I'm half thinking of the oil option with a solid fuel cooker - oil will be on a timer, then when time allows, we would light the fire which would also heat up the radiators. We are lucky that our house is in the countryside, therefore the raw materials are more accessible. Would anyone know price comparisons - our house is a 2850 sq ft house. Thanks for any thoughts on this