Regarding your orginal question - screw caps will not continue to age as only the packaged oxygen is available for aging (so the theory goes..). A cork may let more oxygen in via porousity and cycling movement with temperature changes. A bit of a mute point.
Some screw cap wines are packaged with nitrogen - thus will not age in the tradition sense. They are "always ready to drink". An example would the Molleydooker range.
Back to storage - I had 3 vintec wine fridges and found them incredible inefficient! They where cycling all the time with 2 of the 3 always on!
It is actually cheaper to have a refrigerated cellar than wine fridges, you get more volume and lower running costs. Also you have the booze on site, I tried off site, but could never get the good stuff when I "felt" like it..
A refridgerated concrete cellar with refrigeration panels gives excellent insulation, with virtually no temperature cycling.
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