On Sun, 01 Jan 2012 18:50:23 -0600, IGot2P wrote:



You will find that they have a minimum setting of 40 degrees. Yeah,
33 would save fuel, but 40 give a safety factor in case the heater
break down.


Some also have an internal failsafe
switch that will close at around 40 or so in case the batteries
are dead. I'd check the min temp before you buy one. The
ones I've had for sure will not go down into the 30's. Think
45 might be the lower limit.
(snipped)

I do believe you are correct about the 45 degree F lower limit. I looked
all over a couple of years back to find one that would go down into the
high 30's with no success....45 was the lowest I could find.

Don

Look at Honeywell. I checked a half dozen models and the specs are 40
degrees.