I missed something to save money
Comments
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The gas/power consumption will depend directly on (1) the internal temperature set by the thermostat (2) the outside temperature changes during the period (3) how often the door is opened and for how long (4) the temperature and mass of new items introduced to the interior (5) the air movement past/through the ventilation grills (6) the age/efficiency of the particular unit.
So it might be easier to work out the length of two pieces of elastic!
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