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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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