Using compost bin as a heat pad for seeds

I have all my seeds in my unheated greenhouse. The trays have some clear plastic covers and there's a big cozy fleece over them all. Im in Scotland so not taking chances.
Peas and lettuce have sprouted.
My compost bins are not very hot on the top yet.
I'd like to hear if this works.

I have removed seed trays and put in the greenhouse as i was concerned they would not get enough light. Hopefully now i will see some results from the seeds i planted.

If it’s successful you might have hit on a good idea.

J52 exactly what i thought, nothing lost really if it doesnt work. I have put flowers seeds in there, dont really want to take the risk of loosing veg and salad seeds. I was just concerned about the lack of light, when the lid is in place. I have used seed lids with covers and put something round them to secure in place. Like you my Toms are in the house. I will check daily to make sure they are ok.

Seeds are all doing well in my unheated greenhouse, despite cold nights.
However, the tomato seedlings are inside in front of the French windows.
I’d be worried about light levels, damp and bugs in the compost.
But might be worth an experiment.