Quite certainly Ed is. I know I am, with deep setbacks and woodstove
supplement. And ... quite comfortably, thanks.
Typical furnace is most efficient when it's essentially off (setback)
or essentially on (recovery), not to mention the reduced loss to
ambient durning setback.
Just don't want pipes to freeze, nor to have resistive heat-strips kick
in with heat-pump.
This has been discussed ad-nauseam, if you DAGS on "thermostat setback"
you'll find lots of hits: 70K on websites, and 1550 on GoogleGroups.