Okay, the results are in!
First off, here's my car in its usual parking spot:
It's 11:00 AM. I park facing east, and as you can see, the trunk will be baking for the rest of the day.
Here's inside the trunk (That cooler sat in the garage for a long time. I should have dusted it off before I took the pic!
) :
L-R: GHB and wide-brimmed hat, Cooler, Toolset and junk bag, unused floor mats, and reusable grocery bags.
And here are the results:
Trunk Cooler Outside*
M 120/** 94/** 95/67
T 128/80 96/87 99/66
W 135/82 97/90 102/68
Th 137/84 94/89 106/68
F 137/86 97/95 106/73
Outside temperatures taken from US Weather Service reports.
*My car is garaged at night and doesn't experience the full low.
**I forgot to note the lows before I hit reset
As others suggested, a cooler doesn't prevent stuff from getting warm, it just smooths out the curve. What I didn't realize was that meant it would also delay things cooling off!
I've had four .7L bottles of store-bought water in that cooler for two weeks (along with 2 1L bottles in the GHB). I cracked one open just now, and other than being tepid, it tastes fine. I intend to continue that over longer and longer periods, to get a feel for how long I can leave water in my trunk.
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