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: 221

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

Photos

Loading…
  • Add Photos
  • View All

Latest Activity

JC NATALE posted photos
9 hours ago
Mike Burton replied to Amos Dunham's discussion ISO blower door or other equipment
"Are you still looking?  I have rarely used Minneapolis Blower Door and Duct Blaster Systems I…"
16 hours ago
Jonny Fisher posted a discussion

Used energy equipment for sale (blower door, duct blaster

I've got some used equipment that I need to sell. Let me know if you are interested in any of the…See More
yesterday
Joe Quiroz Jr. liked Don Hynek's discussion Superinsulation retrofit is Complete!
yesterday
Mick Lane replied to Rob Buchanan's discussion High-use headscratcher
"The geothermal heat pump is the most likely culprit.  The heat pump doesn't make heat it…"
yesterday
Mick Lane is now a member of Home Energy Pros
yesterday
Empower Efficiency added 2 discussions to the group Job Board
yesterday
Tom White's video was featured

A net-zero builders formula for insulating a super energy efficient home

Here is Peter Amerongen's formula for insulating a super energy efficient home.
yesterday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service