Register with us or sign in
Apparently there is a litle nut somewhere on a vent that can be adjusted for the opening/closing. Fortunately not had to adjust mine, so not reall ysure.
I have a thermostatic oil-filled heater on a timer in my greenhouse, along with an electric fan for circulation. It is timed to go on at dark and off at dawn. I keep the temp @ 10*C at night. I adjust the timer as necessary.
Because of the high cost of heating,I have moved away fro overwintering plants such as fuchsia,s and pelargoniums and buy plugs in spring.Also any seeds which need sowing before mid march again I buy plugs.The result is I do not incur heating the green house between October and April
I do have automatic vents but find them a nuisance in the winter period, and do not control temperatures effectively,I find shading from the low winter sun more effective.Also strong winds have damaged auto vents.