It’s fairly simple when you think about it. Both porches and sunrooms act as transitional spaces between indoor and outdoor environments. But a porch is typically open to the elements or protected only by a mesh screen that offers scant shielding from pollen, precipitation, dust and dirt, while a sunroom lets in natural light through an abundance of windows. A sunroom may be considered habitable (four-season with heating or cooling mechanisms) or inhabitable (three-season with no heating and cooling) depending on the types of materials used for the windows and the level of insulation. Sunrooms can have glass ceilings, skylights or no overhead glazing at all.
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