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Erect a solid perspex partition or create curtains of bubble wrap insulation to divide your greenhouse so that you only need to heat the part that contains your tender plants. Only heat the area that you need toĪvoid heating your entire greenhouse for the sake of a few delicate plants by creating a greenhouse within your greenhouse. Prevent foliage being desiccated by the flow of warm air by angling the heater to direct the airflow above any nearby plants. Place your electric fan heater in an open, central spot at one end of your greenhouse, away from water. If you’re lucky enough to have a conservatory, use it to overwinter your most delicate plants – those which can’t cope with temperatures lower than 13C (55F). This is also a good temperature if you’re protecting young plants and plug plants while growing them on. As a bare minimum, you can keep your heated greenhouse frost free at 3C (37F), but tender plants like pelargoniums, half hardy fuchsias and citrus trees are happier with a minimum temperature of 7C (45F), and safest at 10C (50F). If you are looking to install heating into a glass structure that is directly attached to your house, a separate. Electric, hydronic, propane, and gas models are all available. Image: Geranium 'Quantum Red' from Thompson & MorganĪvoid wasting energy and money on maintaining higher temperatures than your plants really need. Solar Innovations offers several heating options for warming your glass structures, including conservatories, sunrooms, pool enclosures, and greenhouses. The solar panels are mounted on the roof of the greenhouse and the thermal energy is used to heat the air or water inside. Pelargoniums don't like the temperature to fall beneath 7C A solar panel greenhouse heater is a device that uses solar panels to convert sunlight into thermal energy, which is then used to heat a greenhouse or other enclosed space.