"twfsa" wrote in message
news:WK8%e.11343$GK2.9266@lakeread07...
Edwin.

Are you really saving anything as the furnace will run a longer period of
time to catch up to a temperature that your comfortable with.

Tom

The subject has been debated for a long time. Generally, if the down time
is more than the time to recover temperature, yes, there is a savings. ( we
also like it for sleeping comfort)

Heat is always seeking equilibrium to a cooler place. The higher the
differential between the two spaces, the faster the transfer. This is why
it is cheaper to maintain 68 degrees instead of 70 degrees and why 64 would
be even better in any given situation of a lower outdoor temperatures. .
It is not only the temperature of the air, it is also the sensible heat
being stored in your furnishings that come into play They are absorbing and
giving off heat as the settings change.