Living in the Northeast means that many farmers must utilize greenhouses to get a jump on the growing season.
These green houses must be heated in order to have the seedlings thrive.
Depending on the size of the greenhouse used there are various ways that you can supply you must need a heat to the space. If you are commercial grower, you may want to look into a commercial unit that will supply both heat and humidity as needed into the space while filtering out mold and mildew that can damage the plants. These larger systems are placed in a central location and normal use a boiler to produce heat and steam. They can also utilize a larger variety of fuel sources. 4 smaller greenhouses you may be able to take advantage of either Radiant Heating or even a mini split HVAC unit to control the temperature and humidity levels. There are many variables that come into play when trying to control the environment in a greenhouse. One of the most important is the type of crop that you are trying to grow. For this you need the advice of a gardening specialist but for the heating and cooling you need to contact your local HVAC dealer and let them know your needs. They are qualified Personnel who can look into your specific situation and make recommendations based on them. Utilizing both of these tools you will have a successful growing season and even though it is still frigid outside, you will be able to enjoy the fruits of your labors over the summer and into the fall.