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Heat loss for Basement Sumps

It's hard to get a good pictures with my tiny basement, but here's a shot at it...
Looks more like an outdoor greenhouse indoors, that's technically the "door".
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Here's the sump wrap. Nothing but praise for that reflective bubble wrap.
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And here's another view. The fan is mounted under the table holding the tote with the red lid, the duct rises vertically behind it. The drain and return lines, outside the poly are wrapped with reflective stuff. The diagonal pvc line pumps "old" tank water out to the curb during water changes. It exits thru a small hole in a window, running along my foundation and emptying into a street level gutter. Awesome for driveway ice management.
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Forgive the wires, mostly low amp/low wattage stuff. It's not as bad as it looks:D

Still tweaking it, I may put up one more layer of poly around the outside of it for a little more heat retention.
 
The poly sheets really work at retaining heat? How cold does your basement get? Have you noticed a substantial reduction in costs since using the poly. I understand there are other variables to consider.
 
As far a making a barrier to hold heat, it works pretty well. Also, there's styro sheets in the corner of it to manage the cold coming off the stone foundation. The basement gets about 55ish thru the winter. If it's wicked chilly, maybe upper 40's/low 50's. Not too bad, but the foundation radiates so much cold, it was one of the big problems with my sump in the basement. The other was moisture and I nipped that almostt 100% in the bud with the exhaust fan.

The biggest improvement I've seen is no need for additional and/or larger heaters. Putting the extra sheets up will help out some more with some dead-ish air to further insulate. If I had my way, I'd go the styro sheet shack. But my basement is so damn small.
 
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