wrote in message
oups.com...
Just wondering if the circulation function in programmable thermostat
means that it will turn the fan on 100% of the time when the heat or
cooling is on + it will turn the fan on 35% of the time that when the
heat or cooling is not on.

Can anyone clarify this?

umm, Circulation Function may mean Fan Only to simply circulate
the air with no heating or coolin?

"Many residential HVAC systems use different fan speeds for the different
HVAC functions. For example, the fan speed is lowest for the circulation
function, higher for the heating function, and highest for the cooling
function."