I have stored my scopes in a 3mtr x 3mtr shed for years with no ill effect. Dust is a bit of a problem in sheds so I keep them well wraped up. I use a $12 Kmart sleeping bag over my 10" dob. I think that condensation in the cooler weather is more detrimental.
If you do store your scope in the shed be mindfull of any chemicals you also store there, ie pool chlorine is very corosive.
Rick
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