Without an insulated space you want to do temperature control on, whatever heating you put in will be wasteful and ineffective.
Especially with extremes of temperatures. If it's 15C inside, what is the temperature outside?
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Today was -4c outside and managed to get up to 11.5 with heaters on :(
15C temperature change is massive and probably costs a lot of energy.
So above your brick wall and the roof... all of that just looks like steel.
So it's a massive plate heat exchanger. The more you insulate those parts, the less heat transfer will occur.