Polytunnel doors

[brooklynodog]

It struck me that a lot of cold air and draughts come through the standard green mesh at the top of the doors. I realise in summer thats essential, but right now when its cold at night, is it acceptable to rig up a blind of fleece or even left over film?

[kentvegplot]

I stapled some spare film over the net doors - it doesn't make the tunnel frost proof, but does help with the wind. Once it gets very warm, I just pull the film away, or open the doors.