"Zyp" wrote in message
...
ambient. When the temp. outside drops to 50º F the COP really starts to
take a dive and the gas fired furnace becomes the winner. [More
efficent.]
Suggest take a *good* look at some typical heat pump performance charts that
show outdoor temperatures v/s btu output, and charted along with compressor
draw before attempting to give advice.
--
SVL
|