When deciding between glass panels and polyethylene film covering, there are several factors you need to take into consideration. These factors include how much you can afford to or are willing to spend; environmental factors required for the hydroponic plants you are growing; and how permanent, or temporary, you want your greenhouse to be.

Glass is the most expensive covering for a greenhouse, costing on average six times more than polyethylene film. The framework of your greenhouse will also be more expensive, as glass is heavy and needs a stronger framework. Glass, however, can withstand extremes in temperature better and will not need to be replaced as often as polyethylene film. This being the case, within twenty-five years, you are looking at the same general cost for covering and the difference comes in the amount spent on the framework. If you are unsure about how long you plan on maintaining a hydroponic garden, you may wish to go with the less initial outlay.