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<font face="Times New Roman, Times, serif">I've done a couple of
load profile studies for heat pumps and solar and unless the load
is primarily air conditioning it's a bad match. Ground sourced
heat pumps in general only pencil out if there is a big air
conditioning load.</font><br>
<br>
The only time I'd recommend a heat pump with an off grid system is
if there was a wind turbine that massively over-produced in the
winter. The PV production curve is exactly backwards.<br>
<br>
The clients should take half the money they would have spent on
installing a heat pump and do a thermal efficiency/passive solar
retrofit. Better ROI.<br>
<br>
Best,<br>
<br>
Hilton<br>
<pre class="moz-signature" cols="72">--
Hilton Dier III
Renewable Energy Design
Partner, Solar Gain LLC
453 East Hill Rd.
Middlesex, VT 05602
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