... as a renewable energy installer I would be uncomfortable
recommending that you spend money on RE until you've solved the waste
So, in terms of a better heating solution, given your requirements and
the fact that there's not much you can do about the structure of the
building and insulation and so on (apart from the shutters as
mentioned), I would probably recommend a CHP [combined heat & power] type setup. Preferably
running on biomass or waste vegetable oil.
Given that you are tenants and don't want to mess with the existing
systems too much, an external plant, with ducts taking warm air into
the east side of the building (basement and cafe area) will probably
be of most use.
Realistically, forget about heating the upstairs hall with anything
other than the big gas boiler. Just try to manage your usage of that
place so that you're not heating it unnecessarily.
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