What do other orchid growers do ?Do you shut up the greenhouse and use fans
internally 24/7.This is what i do ,but i am thinking of installing (adding
to this) two 100cm round core vents at low level at each end of the
greenhouse grilled on each side so they will be permanently open to
introduce fresh are.Now i am thinking will this be beneficial and will it
effect heating costs/heat loss .
Thanks Keith