Thanks to Jeff for the detailed explanation...I will look to a
prgrammable thermo -

Scott, my system is inefficient because one of my big radiators is not
getting too hot. I think its a valve issue, so to get the house
confortable, It has to go to 72.

48 degrees !!

I have a 18 year old cat in the house - don't want a catcicle when I
get home. Maybe I will drop it to 62 and see how that goes.

Bluesman