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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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