Picture posting is enabled for all :)
I am really surprised that the minimum temperatures are so similar. That the internal greenhouse doesn't stay warmer.
in previous winters I've noticed the difference in temperature on my greenhouse benches to the border, usually by several degrees.
I'm curious Kg what is all the greenery around the mini greenhouse?
This was then placed under a slatted shelf and the heat from the bulb warmed up the tin and radiated the heat upwards.