Quote:
Originally Posted by trebuchet03
Not directly at least.... They do have defrosters which is why the data has this footnote 
Page 41 explains the frost detection and defrost cycle (up to 12 minutes max).
I like these cooling systems - much more efficient than window units and are scalable But that said - electric heating elements have less losses than any heat pump  |
The way I understand Reverse-Cycle Defrosting, is they turn on the AC mode
for a while to pump heat to the outdoor coil, melting the ice.
(No electric heating elements needed).
Which, it seems would only frost up if it was both cold and humid outside.
Around here in the winter, it stays pretty dry when it's cold..
From what I've read about regular heat pumps, it seems like they add on
some 10 or 20 KW heating elements to turn on when it gets real cold..
(Making your electric meter spin like crazy).
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I don't understand what you mean by, "But that said - electric heating elements have less losses than any heat pump".
Isn't a heating element is just a direct 100% conversion of electrical power to heat??
Whereas a heat pump is just moving existing heat?
Comparing power usage vs BTU out, a space heater is 100% efficient
and a heat pump is about 300 or 400 percent efficient.?.
(At least this is what I've read)..
That low power use per BTU is the main reason heat pumps are so
popular these days.. Electrical baseboard heat around here (20 cents per KWH)
will do a job on your paycheck..