Steve@carolinabreezehvac posted for all of us....

Ok, I'll accept what you say, but I don't understand it.


Ok...then you are familiar with why heat pumps require a 2nd stage of heat
form right?

You are also familiar with the use of an outdoor stat to keep the strips, or
whatever 2nd stage is from coming on if the temps outside are high
enough...I know you have seen us talk about it in the other group.

You might also recall some conversations about an outdoor stat that will
keep the heat pump OFF if the temps drop low enough, and only run the
strips...

the lower the temps, the lower the output of the unit....higher the temps,
the higher the output of the unit..

Look up,
Coefficient of performance
HSPF ratings.




Thanks, Steve,

Ok, I understand what the function is of the outside stats. I will look up
your references, just having major brain block. I can't get it through my
thick skull how running a heat pump at say 50 deg & extracting the heat out
of it can be more than 100% efficient. Let me do a little more research and
thinking so I get back on track. Am I confusing efficiency with COP?
--
Tekkie