OK, yet another refinement of refrigerator cooling efficiency - not radical, but effective.
Many here are familiar with the small dual-fan accessories that attach to the refrigerator interior cooling fin assembly - they work pretty effectively in circulating interior air for better cooling clear done to the lower shelves of the refrigerator.
I tried one, and liked it - but figured a pair of the Ebay cheapie PC cooling fans - the larger ones for circulating air inside the whole PC - would work even more efficiently in air circulation due to their larger size, covering more area of the refrigerator fin assembly.
BUT, I wanted a more gentle airflow, rather than the relative blast these fans are capable of - so I wired a pair in series so that each fan was operating at half power and speed - here's how they look installed:
How do they work? Well, my refrigerator is pretty well packed solid with stored food - stuff we'd really preferred frozen, but at least far cooler than typical interior freezer temps - so here's how ours is working with the thermostat set to it's lowest setting, temp at top shelf nearest cooling fins:
Not bad - 8 degrees - and down at the lowest shelf?
About 26 degrees - typically more like 20 degrees, but the displayed temp had increased slightly as I set up for the camera shot. Needless to say, the stored stuff is being kept quite decently cold - cold enough to keep ice cream well frozen at the top shelf - and only about a 12 degree increase in temp from the top to bottom shelf - in a VERY tightly packed and loaded refrigerator.
Connected in series, these fans only draw 180ma - about 2.5 watts - and are extremely quiet due to their reduced speed, but the gentle and even airflow is clearly doing the job!
YUP - I'm a happy camper!