On 21 Sep 2011 16:40:15 GMT, Bob Eager wrote:

I used an indoor/outdoor thermometer with built in alarm.

Put the 'outside' temperature sensor inside (thin wire stright over the
door seal) and set it to shriek if the temperature rose past a certain
point.

Me too. Took a bit of looking to find one with programmable alarm limits. But it
was cheap...


Thomas Prufer