That's a pretty normal feature of modern heat pumps and thermostats. It is made possible/practical/economical by ECM blowers (electronically commutated motors). The electrical draw in the lowest speed mode is maybe 25 watts or so.
The idea is that the operation of the blower provides air filtering and "de-stratification". By moving the air around the house, even though there's no call for heat, isolated cold and warm spots are reduced.
The feature should be optional, and controllable by the thermostat. If the circulating mode bugs you, you can set it up to run only when there's a call for heat by changing the programming of the thermostat.
The thermostat I installed in my own house has an additional option -- in the "circ" mode the blower can be programmed to turn on and off randomly (it is on about 1/3 of the time when there is no call for heat). This garners most of the benefit of the circ mode while reducing fan-related energy use by 2/3 -- down to about the same as that of an electric clock.
Add this to three stages of heat and two stages of cooling, with blower speeds appropriate for each mode, and it has proved a quiet, efficient, effective setup.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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