Passive environmental control

The following is posted on behalf of an acquaintance who wishes
ultimately to bequeath a property to one of the national heritage
bodies.

The property includes a separate garage which is to be rebuilt as a
general museum store. The property is not always occupied and
air-conditioning in the store is not practical. The building will be
well-insulated. Minimal heating will be used in winter to raise the
temperature and relative humidity above outside conditions to safe
levels. The problem is in summer. A prolonged hot spell will
eventually cause the temperature and relative humidity to rise (and
stay high due to the insulation). Can this effect be simply negated,
possibly by automatically controlled vents or reflectors? (It will
be in direct sun every morning). Does anyone know of any similar
successful projects or suitable suppliers (in the UK)? Would
photovoltaic vents be suitable? Are there screens in vents to keep
out dust/insects? Any suggestions appreciated.


                                  ***
                  Conservation DistList Instance 22:57
                   Distributed: Monday, April 6, 2009
                       Message Id: cdl-22-57-012
                                  ***