On 4/2/2014 10:19 AM, nathan984 wrote:
For the past few days its been quite foggy and damp and i walked into
today and the humidity was 99% i opened the window and door to circulate
the air but had to close it after 10 minutes because the temperature
was lowering anyway it lowed the humidity about 5%. I know that the
humidity is to high so i was wondering if there was anything i could do
to lower the humidity like a small computer fan to circulate the air.

A fan will not remove humidity. It will merely circulate the moisture
around the interior of the greenhouse.

An exhaust fan at an open vent will remove existing moist air, bringing
in fresh cold air through another vent. A heater will then raise the
temperature. Warm air has a greater capacity to hold moisture. If no
moisture is added, warming the air will lower the relative humidity.

The only other alternative that comes to mind is a complete heating and
air conditioning system. As it cools the air, the air conditioner
removes moisture; this is why air conditioners require drains. Then the
heater warms the air to lower the relative humidity. When the windows
in a car become fogged with condensed moisture on a cold night, this is
the recommended method for clearing the windows -- cool the air and then
heat the air.

--
David E. Ross
Climate: California Mediterranean, see
http://www.rossde.com/garden/climate.html
Gardening diary at http://www.rossde.com/garden/diary