RP wrote:

Some people say the COP of a heat pump can be less than one, but that
seems hard to believe. OTOH, they do wear out.

Sure it can, else there wouldn't be an economic balance point...

Seems to me it has to be greater than 1:1 for heating, since the compressor
heat ends up in the house. This requires good defrost control: turn off the
compressor and run the outdoor fan if the outdoor coil is about to freeze,
and turn off the whole shebang if the outdoor temp is less than 32 F. IIRC,
Carrier did experiments with heat pump coils covered with 2" of ice, and
the COP was still greater than 1.

http://www.cleanbutt.com/PRODUCT.ASP, with optional wireless remote control.

Thanx, very good site. The rim deflector is a must have item.

The remote adds $100. EXTREMELY obese people find it useful.

Nick