There are two main types of spray foam insulation, open cell foam and closed cell spray foam insulation. But what is the difference? Well if you are still wondering “what is better open or closed cell insulation?” then you are in the right place, as we breakdown what insulation type is best for your project. At Evergreen Power, we have noticed a great number of people who have been misinformed or have not been informed by the difference between open celled and closed celled.