My partner takes various medicines which have storage requirements such
as "between 15 and 30C", "less than 25C" and so on.

Pharmacists are be required to have storage facilities capable of a
range 8 to 22C.

In a domestic context, it is difficult to find a suitable location in
the warmer weather. Nowhere in our house is cool enough. Standard
fridges are too cold. Travel cool boxes (and similar) that I have seen
do not have proper thermostats. Wine coolers (the best so far!) are
overpriced and too large.

Any ideas how I could cobble together something that achieves:

Reliability
Reasonably accurate, selectable temperature (8 to 22C would be
suitable).
Reasonable efficiency
Small volume (only a few packets of pills, etc.)
Quiet
Low cost!

I have a little bit of spare 50mm Kingspan...


Rod