Great thread you've got going here! I first wanted to fit a dehuey in my soon-to-be greenhouse but thanks to you i've decided to install a proper heater! Would anyone care to comment on a few points i've come across?
My greenhouse size will be 15-20 feet long, 10 feet wide and 7 feet at peak height. A small greenhouse
here we have hot summers and usually wet and a cold falls. I plan to run my heater in september and october...by then usually all of my plants finish
my main concern is high RH during flowering due to which i usually lose a lot of flowers.
1. I can choose between 4mm,6mm,8mm and 10mm twin-wall polycarbonate. Should i just choose 10mm if i can afford it or will that be an overkill during the summer? I don't plan to provide cooling in my greenhouse. The standard here is 4mm and sometimes 6mm.
2. How many times per day should the air be changed inside the greenhouse? I plan to use 1 exhaust fan (1600 cfm or greater power) and two intake shutters on each side. To keep the humidity low i plan to exchange the air in the morning/during the night and then heat it so my RH drops.
3. I plan on using 2 electric-ceramic heaters (2-3kw each...online calculators say i need about 15.000 BTU's to heat effectively). Where would be the best place to put them? Blowing hot air directly into the plants is probably a bad idea?
4. I have the option to install a roof mounted automated window. I guess it would do good during the summer? Yes or no?
5. We have good soil here so i plan to plant directly into the ground. I should probably provide some cover so the water doesn't evaporate directly into the greenhouse and cause RH issues? Geotextile maybe? Your thoughts on this.
I'm planning to eventually trick out the greenhouse with automation based on raspberry pi.
I will be very grateful to everyone who provides an insight on this! Kudos