On Thu, 22 Aug 2019 15:22:51 +1000, "Rod Speed"
wrote:



wrote in message
.. .
On Wed, 21 Aug 2019 19:05:44 -0500, Arthur Conan Doyle
wrote:

Ralph Mowery wrote:

For heat pumps you can say that electricity is more than 100% efficient.

The heat transfered from the outside is more than the heat produced by
electricity if used as resistance heating.

True. However, heat pumps are decidedly more expensive than conventional
furnaces to install and maintain, so that does need to be considered.

If you live in a place where heat pumps actually work, you probably
have an A/C anyway. The incremental cost for the reversing valve is
minimal.

There's more involved than just a reversing valve.


But the incremental cost on the line is minimal. Just because of the
economy of scale most small HVAC systems might be heat pump by default
and it is the special order to delete it. It is getting that way with
mini splits here now.