I don't know if they are still made, or if they would help in your situation, but here goes...
When I was but a wee lad, my dad installed two ceiling fans in our house. They plugged into an outlet and had an inline switch. Our installation included a chain to form a swag.
Perhaps, as long as your sunroom can support the weight of the fan, a fan such as this would be easier to install than a hard-wired fan.
