No. And manual-defrost chest freezers tend to be very efficient, using
half as much electricity as modern frostless refrigerator-freezers.
It's possible your freezer costs only $25 a year to run. Consider
filling it with milk when its on sale, taking care to remove at least
1/2 cup per gallon and purging the air to allow the containers to
expand as the water turns to ice.
It will take some energy to chill water and get it down to temperature.
Once that is done, there will be less air exchange when the door is opened
so there will be some energy savings in the long run. In the event of a
power loss, the thermal mass will keep things from thawing as rapidly also.
Supposedly a full freezer is more efficient than an empty one. I had a
large chest freezer and used bags of ice and soda bottles filled with water
to fill up the space. It seemed to reduce the fluctuations in temp
whenever the lid was opened. It also helped A LOT to keep the temp cold
when the power would go out for hours at a time. I kept mine at -10F.
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