Bit late commenting on this but we also have an old house and the
council did free energy evaluations, but because of its age replacing
the oil boiler with another was the best option.
Insulation is the key either on the outside or inside, we renewed the
roof which helped a lot but compared to modern builds its very
inefficient in terms of storing the heat.
Our neighbour has a heat pump but they had to go very deep and I think
it cost them 80000 swiss francs.
IanW
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