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: 307

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

Videos

  • Add Videos
  • View All

Twitter

Latest Activity

Steve Last commented on Tom White's blog post Moving Forward with Home Performance
"Hopefully politicians seeking quick wins for the US economy will see home insulation improvements…"
5 hours ago
Steve Last posted a photo
6 hours ago
Judy Rachel replied to Dean Kirkland 's discussion Im looking for a blower door / duct blaster / manometer rental in So Cal
"You can borrow the equipment from the Tool Lending Library maintained by SoCalEdison.  This is…"
23 hours ago
Profile IconSteve Last, Paul J Anzalone Jr, Jon Traudt and 1 more joined Home Energy Pros
yesterday
Jamie Medlin replied to angela stanzione's discussion Used Weatherization and auditing equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Please let me know if the flowhood  still for sale. jmedlin@archonenergysolutions.com"
Friday
Jamie Medlin joined allen p tanner's group
Thumbnail

Energy Auditing Equipment for Sale, Trade or to Purchase

Discuss the pros and cons of the equipment you are interested in prior to purchase. Post equipment…See More
Friday
Laurie DiDonato posted an event
Thumbnail

HERS Rater Training Discount: Register by 1/6/17 and Get $100 Off! at Energize CT Center, North Haven, CT

January 23, 2017 to February 3, 2017
Become a HERS Rater with the NEHERS Alliance!Online Component: January 23rd-February 3rd, 2017 -…See More
Friday
angela stanzione replied to angela stanzione's discussion Used Weatherization and auditing equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Yes, I do. Pictures are above. I have a newer fan, I have a frame in a case and I have panels."
Friday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service