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At 32 to 40 degrees if the only gas appliance running is the furnace, then one tank should last a week or better, depending on thermostat setting. Also, try electric heaters to keep the furnace from running any more than necessary.
With temperatures in single digits (F) and water heater running only on propane, we used to get three days on one 30lb (7+ gallon) bottle.
A lot depends on the thermostat setting and whether the water heater is on propane.
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