Quote:
Originally Posted by H16bill
OilPan 4,
That's what the literature for the Aura series says (-22F/-30C). The Senville Leto series goes down to 5F. Sounds like that might be what you have.
AC_Hacker
The HSPF4 is 10.2 for the one I'm looking at. Its not 12 but seems ok. That's why I am posting to see if I am missing something before I dive in.
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You can take the HSPF and devide by 3.14 to get COP.
If you really dig into the literature for your heat pump choices, you should be able to find charts that illustrate the decline of COP as a result of temperature decline.
In the end, it's not only money but also the amount of coal burned (CO2 created) to provide heat.
-AC