It sounds like you've thought the design through well enough to where it will be far superior to any greenhouse that is around here. The ones around here in commercial plant nurseries are all a combination of plastic and glass in a three season arrangement without any provision for being warm outside of reasonable weather conditions.
Southern Ontario makes it a little easier as it is likely south of my climate(at least Toronto is) which should make it a little more mild than where I am and more reasonable for what you are doing.
I think you might have the information you need for your unit conversion, do you have other questions? Sounds like an interesting plan and hopefully you'll share more details as planning and implementation progress. Good luck.
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