Hello @kajakskak. Can you get hold of a greenhouse heater? Maybe you could insulate your greenhouse with some bubble wrap, the kind with big bubbles is best. The other thing we use here in the UK is gardeners fleece. We have been warned of a frost, so some of my babies (plants that is ) are wrapped up at the moment.
Just being in the greenhouse gives a little protection, But as Tatters says Heaters Powered by Paraffin, Oil, Electric or just fleece line or bubble raping.... I protected my Red Banana plant by rapping in a Duvet lol In the during winter & now I'm placing a Large dustbin over it every night in the garden. I uses anything that is at hand just about if it fits the job
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