Furnaces come in two stage and two speed heat ratings. Boilers call it hi
and low fire usually. It can be automatic change over by a thermostat in the
water jacket that reads the hot water temp, an outdoor therm that switches as
the temps outside get colder.
In the case of electric, a sensor in the duct detects the heated air temp
of a warm air system and fires up more electric heat if the temp drops below a
set point.
In the case of two stage, additional gas, electric, whatever is added to
the operation. In the case of two speed, the unit stops and re-starts as the
fan continues to run the entire time. In the case of a two speed or two stage
variable speed, the unit will transition from one speed and volume to the other
and back. Multiple speed units always start in low output and will return to
low output again before turning off normally.
The idea behind two speed and two stage units is extremely even temps are
maintained for comfortability and max savings on operating costs. Turning the
thermostat off will defeat any purpose in having even heat or cool since the
wall temp it is mounted to needs to be even also for proper operation. These
new thermostats are accurate to less than one half degree, where as the older
styles of thermostats are only designed for a min of a 3 degree swing.
.....................bob
[Non-text portions of this message have been removed]
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