Drip systems water in small amounts which helps plants fully absorb moisture. It is easier to regulate how much water your plants are getting with a drip system. You can build a basic drip system yourself. When installing your drip system be sure to bring a chair to reduce wear on your body– the process can easily wear out your arms and legs from stretching and kneeling.
If you're unsure as to whether you need to worry about the humidity in your greenhouse take a few measurements. Find out the desired humidity range for your plants, then take several readings of the humidity in your growing area--try late at night, early in the morning, noon, and evening. Chart your data and find out if the humidity is with-in range.
What really makes a greenhouse, a greenhouse, is environmental control. When using thermostats, remember to place the thermostats in the center of the room at plant-height, and to shield them from the sun.
Remember, though you start out small, in time you may need a larger greenhouse. To not have to rebuild your greenhouse every time your gardening becomes more ambitious start out with an expandable greenhouse. A greenhouse made of PVC piping will easily refit, and check out Hobby Gardener for their quality adjustable greenhouses.
