At 08:04 PM 6/28/2015, george jannini wrote:
>   As for which mode cools better, when I am plugged in, I turn the
>thermostat _all_ the way up.  Overnight, a thermometer set on the top shelf
>on the right side, will generally read 29°.
>
>   If I can't plug in, running on propane the pointer is set horizontal
>(pointing to 9 as on a clock) or even lower to achieve 29-32.

You might try using the lower setting -- the knob 
is a true thermostat, switches the electric and 
the main flame on and off at the setpoint.  Pilot 
flame (bypass around the main valve) runs 
continuously.  All off but pilot on MIN, all on on MAX.

If electric isn't cooling as well as gas, check 
for correct heater consumption (85W) and good 
conduction heater to boiler.  Flakes of corrosion?  Oxides are insulators.

Yrs,
d