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I thought it would be a nice gesture to pass on savings I could get by purchasing in a larger quantity. Apparently, its not appreciated.

FYI, it is 3° Celcius per 1000' so in that hypothetical situation, 100°F is 38°C. -3°C/1000' = 8°C at 10,000'(or 46°F). Its still 100°F on the ramp while you're taxiing out which is where these units were intended to be used. Run them till you climb to cooler altitudes, then switch it off.

Roy, run time is an issue as is weight. We've experimented with freezing milk jugs and gotten much longer cooling times, not to mention the savings. On a longer trip, climbing to cooler temps is more practical and leaving the unit in the hangar would probably be best. Also, they are not completely full w/ 25 lbs of cubed ice. You do also have to add 2" of water, but you still want there to be room to prevent any accidental spillage during turbulence.