Calgary 14
If the furnace has a ECM motor it will cost you about 14 bucks a month to run continuously.
Ecm motors are variable speed fully modulating motors that use the least amount of power and ALL furnsces in the future will be equipped with these .
When ON they'll use circ speed(lowest speed) and store inertia and not only use a low amount of power but continue circulation of air at a minimum cost.
All 90+ % efficiency furnace are designed to operate this way....especially the carriers who have patented this technology only.to be copied by all other manufacturers but not entirely replicated as carrier motors , gas valves modulate up and down completely as compared to others that just go up and OFF.
Thermostats and ventilation switches have to be able to control.your ecm motors as well unless the control board has been set to automatically control the ecm motor as per the design.
There's allot more to be said but this is in brief how they work.
Lastly . You aren't harming the motor running it constantly if it's an ecm....there designed to run all the time.....dc motors and belt drive not so much obviously as the cost is 75% higher.
And don't forget ALL furnaces with air conditioning coils or high efficiency need monthly filter changes or.cleans to keep congestion out of them.
Hope this helps
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