an equally important consideration (besides the relative efficiency of one mechanical system vs another) is whether it makes more sense to drill baby drill and pay baby pay for geothermal, or to put a comparable effort into air sealing and insulating, etc, and installing a smaller conventional mechanical system accordingly. <br>
<br>this is not to say that there are situations where a deep energy retrofit is too intrusive, and a gizmological (to borrow from thoughtful Ontarian friend) solution is the better deal. But in principle, my working assumption is that conservation is the first task.<br>
<br>AA<br><br><br clear="all"><b style="color:rgb(0, 102, 0)">Alan Abrams</b><b style="color:rgb(0, 102, 0)"><br>Abrams Design Build LLC</b><br style="color:rgb(0, 102, 0)"><i style="color:rgb(0, 102, 0)">A sustainable approach to beautiful space</i><br style="color:rgb(0, 102, 0)">
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<br><br><div class="gmail_quote">On Fri, Jul 22, 2011 at 10:08 PM, Matt Dirksen <span dir="ltr"><<a href="mailto:dirksengreen@gmail.com">dirksengreen@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div bgcolor="#FFFFFF"><div>I heard from a mechanical engineer friend that the inverter tech in mini-split systems is making it's way into central systems now. Carrier should have it's new stuff out this fall. Lennox may even already have it out, for all I know. He says that it's efficiency should rival the current ground source heat pump systems, but without the need of well digging.<br>
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