The frosts have arrived and everything is slowing down in the tunnel.
We always have fresh salad on Christmas Day for breakfast (with sliced smoked venison and a small sloe gin) ... real local, high quality, low priced produce. Yes, I know venison is dear (sorry) but pound for pound, higher quality, less is more, enjoyment over over eating.
I digress ... the upshot is, we need to keep the polytunnel warm now the frosts are with us and desire, nay, need salad etc. We do not have a quiet period in the tunnel ...
We usually put hay bales into the spare areas of the tunnel (back door, side paths etc.) which absorb the heat of the day, store it and let is out through the night. It seems to work, we don't get vermin nesting, there's somewhere to sit and there's always that musty smell ;o).
Being plastic, the tunnel cannot have a stove... we didn't put in an electricity supply so tube heaters are not an option (plus we wanted to be as eco as possible).
If you guys have any extras or better ideas, it would be good to hear them. Have fun in your gardens ... keep warm !