Strelitzia won't like an unheated conservatory in zone 7. They need a minimum of +10C/50F so take it into your house and give it a sunny position.
It should be easy enough to establish if your solarium is double glazed and also check how draught proof it is but definitely a good idea to install a thermometer and monitor temperatures.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
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It should be easy enough to establish if your solarium is double glazed and also check how draught proof it is but definitely a good idea to install a thermometer and monitor temperatures.