Not sure about the energy saving, but you lose either 15 or 20% of your heat through the floor. Can't remember which it is, but you can look it up.
I looked up your greenhouse. Nice size.
Triple poly. Great. I have triple poly too, 16mm triple-wall poly
I would cover North and East walls. (I haven't covered my east wall yet in this new greenhouse, but I did in my old greenhouse.) If I remember correctly, AFC sells a bubble wrap that is made specifically for greenhouses. Looks durable. Don't buy cheap bubble wrap. It won't hold up. Even better, think about using Reflectix.
https://www.lowes.com/pl/Refle... It is a thin layer of bubble wrap with aluminum coating on each side. It is better than plain bubble wrap if you install it properly (air space between the Reflectix and wall) and reflects the heat back into the greenhouse. I've used it in both my greenhouses.
You'll love it in the cold Chicago winters. Sometimes I spend a good part of winter afternoons just puttering in the greenhouse. I also bought 2 high deck chairs so we can sit and relax in the winter.
