|I am building a custom greenhouse on my 3rd floor apartment balconey. I need to know if the greenhouse needs to have ventilation. Like space on the bottom of the greenhouse and toward the top. In Alaska, let me remind you.
|Yes, your greenhouse does need a ventilation method. On sunny days, it will heat up just as a parked car heats up. You might want to look into the automatic vent openers, especially if you are not always home during the day.|