What's the problem with adding a bit extra heat to the hot, high pressure
gasses. One way or another, the heat will have to be carried away. With
the "sealed" system (whereby often the compressor is insulated!), the extra
heat ends up in the condensor coils which it it carried to the user (in a
heat pump) or dumped outside.
These is a slight loss of efficiency because these gasses are further
"superheated" before being compressed. But the savings come from not
having a separate system to coil the motor windings and not having to worry
about wear and tear in a rotating, high pressure, seal.
Well, most "window" A/C units do place the fan motor in "un-conditioned"
space but they usually have one fan motor power both fans.
Placing the air handler fan in "un-conditioned" space may not be worth the
A much better pay off is using variable speed high efficienty fan motors.
Some of those old 3 speed motors had terrible efficiency to as low as around
50%. The variable speed motors have efficiencies up in the 90's.
BTW: home HVAC systems are much more reliable than their automotive
counterparts. A home HVAC is "pumping" at least 2,000 hours a year.
4,000 hours isn't unusual (that's a 50% duty cycle.)
Cars are typically used less than a total of 2,000 hours in a year. (At an
average speed of 20 mph, that works our to 40k miles/year. Throw in a 50%
duty cycle and you get 1,000 hours.
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