I'd like the experts here to weigh in on this.  I've been hearing a lot of claims about the better IAQ you get with geothermal systems.  In my mind, a forced air system is still a forced air system, so I'm not sure if there is any validity to that claim.  But I'm not an expert.  If you feel one way or another, please post, and substantiate your position with the facts.  Thanks!  I really look forward to everyone's response on this!

Views: 182

Reply to This

Replies to This Discussion

Hi Trish,

I cannot think of any reason why a ground source unit would provide any better IAQ than a conventional heat pump, with one exception. The ground source unit has no need to defrost. So there will be no reverse cycle cooling calls in the heating season. Consequently, the risk of "dirty sock syndrome" could be reduced. But the dirty sock microbe doesn't visit every household. So it seems a stretch to make much of an issue about it. 

On the other hand, if you are comparing ground source with a gas or oil fired forced air furnace, there are considerable differences. One that is seldom talked about is the compounds that can emit from heat exchangers. Some chemically sensitive individuals will have difficulty with the cutting oils and other chemicals evaporating in the air through the ductwork. It seems about 25% of the population are disposed to have such reactions (based primarily on hereidty). Of course any time you have a fire in the cave, it increases the risk of gas or oil leaks and combustion byproducts. CO will get you regardless of your DNA.

With very long run times the GS heat pump can clean the air better with  wet coil than most filters.  I took an air advice particulate counter to compare dry coils VS wet coil and wet coil was = to merv 8.    I hear that GS HP do not need yearly cleaning  I disagree.  the coil still get dirty, filter still need to get cleaned/replaced, parts still need to be replaced - motors relays get pitted, go down,  stick, drag.  I find most GS heat pumps still need 2 hr yr "tune up"  " cleaning"  I do not put gages on but will cheak amp draw, SP, temps, stat and operation.  Back to better IAQ  over all yes only with better air flow and better filter. 

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Sean Lintow Sr replied to Robert Cameron's discussion Air duct testing questions.
"#1 - outside "conditioned" space & really should not be allowed #2 - up to the AHJ if…"
1 hour ago
Susan E. Buchan posted a status
"EEBA's Conference in St. Louis last week was a great success! Presentations at http://www.eeba.org/conference/2014-presentations."
15 hours ago
Jan Green replied to George Kopf's discussion Real Estate Professionals need our support - but how?
"It helps for companies to understand what the public wants and to educate them so that realtors are…"
15 hours ago
Hal Skinner replied to Hal Skinner's discussion An example of what an RCC can do with no R- insulation in the walls.
"Hi Bret and thans for the offer.   I sent you a friend request so I can send you a…"
16 hours ago
Kevin Jordan shared George Kopf's discussion on Facebook
16 hours ago
Kevin Jordan replied to George Kopf's discussion Real Estate Professionals need our support - but how?
"so who funds the greening of the inventory? would this be company by company?"
16 hours ago
Don Fitchett commented on Home Energy Magazine's blog post A Day in the Life of Learning
"This is a great addition to the July edition. Our PLC training uses the three areas too, but more…"
16 hours ago
Bret Curry replied to Hal Skinner's discussion An example of what an RCC can do with no R- insulation in the walls.
"Hal, Not sure if you serve the Little Rock market, or know of a company who does. If you know of…"
16 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service