Edwin Pawlowski wrote:

wrote in message

If the light uses 15 watts and the fridge uses 5, on average, that's
20x24h = 480 Wh/day, ie 175 kWh/year if the room were always 40 F or
26x24h = 624 Wh/day if the room were always 70 F. It would be nice
to get this down to 100 Wh, like the Mt. Best chest freezer fridge
modification.

With better controls, it might only need 5x23h = 120 Wh/day.

Or 24h(40F-10F)1Btu/h-F/3.41Btu/h/W/3COP = 70 Wh/day, ie 26 kWh/year
worth $2.60 per year at 10 cents/kWh, with a 10 F freezer compartment
and a 40 F fridge compartment in a 40 F room.

The thermostat unit heats just that tiny portion of the unit to make the
freezer be colder.

But the thermostat's in the fridge compartment, no? The fridge wants to
be about 34 F...

To warm the entire refrigerator box with a 40W bulb is wasteful and will
warm the contents a bit.

Who mentioned 40 watts? A bulb in the box would not change the box temp.

Nick