Heating systems “rediscovered”: steam/hot water, “bark” stoves (moist heat), manure as a heat source and charcoal heaters (though, high sulfur coal was found to be phytotoxic). Greenhouses were built with flues in the floor for below-ground heating. Note: Since greenhouses started in northern Europe, heating was emphasized. *1700’s – Greenhouse designs continue to improve in Europe and then in the USA, including multi-span structures. The first greenhouses with glass on all sides were built in Boston…
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