On 10 Apr 2007 20:59:56 -0700, "Mr_Bill" wrote:

Dave -

Thanks for the reply.

I would have thought that the load that the compressor presents
to the compressor motor is more or less constant.

I would think that the outside temperature is to the desired inside
temperature, or the closer the inside temperature is to the desired
temperature, the less the refrigerant would be warmed in the
evaporator. So the less effort it would take to compress it at the
next stage.

This is sort of the corollary to, You don't get something for nothing.

You also don't usually have to expend effort for nothing. If you get
so much cooling for so much effort, you can usually get half as much
cooing for somewhat more than half as much effort.

If so,
then the power factor, whatever it might be, is also constant,
and is factored into the SEER.

I agree that the SEER rating is based on some set of operating
conditions, and that in the real world the efficiencies might
go down (for example, if it is really hot then the compressor
radiator becomes less efficient). I would think, however, that
the BTU would go down, and the electrical power consumption
would remain constant.

I dson't think the electric would stay constant. Same reason as
above.

But, obviously this is more complex
than it seems at first glance.

Anyway, thanks for the reply.