[Greenbuilding] Geothermal a/c

[Matt Dirksen]

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. 

Cost has typically been the biggest issue for geo installations, so the inverter tech might be a good compromise. I know I am thinking a about it when I ditch my 30 year old gas furnace. 

Of course only geo will qualify for the no-limit 30 percent tax credit....

Matt



On Jul 22, 2011, at 4:38 PM, "Ron Cascio" <roncascio at verizon.net> wrote:

> Steve,
>  
> Yes, you are correct. But a great deal of folks refer to ground/water source heat pumps as geothermal units, as did Phil, so I stuck with it for his sake. Sorry for the confusion.
>  
> Ron
>  
> ----- Original Message -----
> From: natural building
> To: Green Building
> Sent: Friday, July 22, 2011 4:31 PM
> Subject: Re: [Greenbuilding] Geothermal a/c
> 
> Semantics perhaps, but I believe you are talking about 'Ground Source' or 'Water Source' or 'Air Source' heat pump systems.
> My understanding is that 'Geothermal' is a system that taps into underground heat sources such as steam or even volcanic heat sources...
> 
> Cheers, Steve.
> 
> Steve Satow
> 
> www.naturalbuildingsite.net
> naturalbuilding at shaw.ca
> 
> On 2011-07-22, at 1:22 PM, Ron Cascio wrote:
> 
>> Phil,
>> 
>> We have a geo heat pump in our own house here on Maryland's coast, and as of the last few years use them exclusively in our projects. It's now 99 degrees with a heat index of 121. I just went up to our attic and it's 80*. The house is maintaining a very comfortable level of conditioning, and not burning a great deal of KWs.
>> 
>> I'm sold, as are my clients.
>> 
>> Ron
>> 
>> 
>> ----- Original Message ----- From: "Phil Schawe" <schawe at aol.com>
>> To: <greenbuilding at lists.bioenergylists.org>
>> Sent: Thursday, July 21, 2011 9:10 AM
>> Subject: [Greenbuilding] Geothermal a/c
>> 
>> 
>>> Another question:
>> 
>>> 
>> 
>>> I'm designing a waterfront house on the the gulf coast, and considering a geothermal heat pump for a/c.
>> 
>>> Especially attractive with 30% tax credit. And no outside compressors degrading in salt-air.
>> 
>>> 
>> 
>>> Anyone have experience with geothermal cooling in a hot/humid climate?
>> 
>>> I see them touted a lot in heating climates. Just curious if I should believe the hype.
>> 
>>> 
>> 
>>> And yes, I've talked with suppliers about 'hot loops' and why they happen.
>> 
>>> 
>> 
>>> Thanks for any insight!
>> 
>>> 
>> 
>>> Phil Schawe
>> 
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