I can grow lettuce year round but they just start seeds for 6-8 weeks.
Very basic we started the room as a hobby then bought the farm 4 months afterwards it works for now.
Discussion
We have the greenhouse since autumn last year. So far just to have tomatoes a bit longer and safe plants from winter.
I started to grow from seeds in my basement this winter. But now all of them are in my greenhouse.
Except the chilis they are on the windowsill