I estimate it costs around $100 for the electricity when outside temp is below 45 degrees or above 90 degrees. how much equipment do you have and how much does it cost to run it ?
most of my plants were without many leaves or dry brown leaves before I added humidity
they are now sprouting and doing much better. The other thing I have done is to water twice a week even if the pots are not dry. The bananas are sending up new growth. The brugs are sending out new leaves. Many perennial plants are sprouting in their 1 gallon pots. the EEs just sit there not responding
The attached graph shows my progress for the 1st 10 days of January 2008
My greenhouse is the 10' x 12' Harbor Freight modified to have two layers of double layer plastic on 2 sides, the normal roof, snuggled against the east wall of my house and the south wall of my house. (GH cost $700)
the equipment currently running in the GH is an 3,000 cfg evap air conditioner, 2 each 1500 watt oil core electric heaters, two circulating fans, and a charlies greenhouse humidifier and humidistat (Equip cost $950) see more details on my web site at http://www.rader.org/garden/my_garden.htm
I can now control the humidity (before the humidifier the GH was running 30% - 40% humidity)
the two heaters raise the temp between 20 degrees and 25 degrees. (there is no sign of humidity in the GH, zero moss or mold)
most of the advice you will hear is for a more humid climate. I am near Sacramento California zone 9, 70 feet above sea level and about 100 miles from the ocean) where we only get rain a few times between dec and feb. No precip the rest of the year. we do not get moss on the north side of anything !
