How To Keep Your Furnace Running During a Power Outage. The electricity can be down because of many different causes like a heavy snow storm, wind, fire, tsunami, earth quake, hurricane, tornado, etc. The power can be down for a couple of hours, a couple of days, or weeks or months, but if this happens in the middle of the winter with temperatures way below freezing while having family and little children living with you, this solution can help turn the heat back on depending on the size of the house and the size of the furnace at least for some time. The temperature of the house can be brought to a very high temperature and try to conserve that energy through the night until the batteries get charged back up by a car alternator or solar panel. If one has multiple heavy duty deep cycle batteries, they can cycle on and off for days or hours, they will be discharged during the night and recharged during the day.
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