I've just removed the bottom panes from the doors in the top two greenhouses. I replace with wire mesh to keep the birds out. Top greenhouse, lower one of 2, middle greenhouse the bottom two of three. The door on the Darlingtonia House is polycarbonate so the wire mesh remains in all year round in the bottom half* and I cover with bubblewrap for the winter. I removed this bubblewrap a month or so ago.
Perhaps spring has arrived?
* removal or replacement of the polycarbonate sheet means a door rebuild so a sheet wired onto the permanent mesh is much easier.
It's a late one this year. The glass will be remaining in for at least another week. The forecasts are not looking very optimistic. Rain at least every day to next weekend and temperatures rising very gradually to a max of 19C next Saturday the 29th, then back down to 16C