I had an overnight low of 36* on saturday night, only 41* last night. But the Propane boiler was needed Saturday night and last night..
I put a few hours of work into the AA boiler, but if it gets seriously cold and looks like it will stay that way for several days, I'll fire up the big boiler with the 'Iron Fireman' stoker. I have five tons of Buckwheat coal for it to burn.
It is supposed to warm up into the 80's this week, so we just had a 'warning' from MommaNature.