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: 176

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

Kurt Shafer replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Reading the Invisco description you will find that it is designed to be surrounded by cellulose to…"
4 hours ago
Glen Gallo replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Kurt, I think cost of operation is always a factor but I am not sure I would leave it just cfm.…"
5 hours ago

Paul DelVaglio just added their location.
(via Member Map)

6 hours ago
Paul DelVaglio posted a photo
7 hours ago
reflintorm replied to Jamie Kaye's discussion Flickering LED lights
"I think, Better to replace the dimmer switch if it is not recovered then once go through the…"
11 hours ago
Kurt Shafer replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Glen,  You are the first person who has ever told me they prefer lower CFM. What you left out…"
21 hours ago
Glen Gallo replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Tamarack has lower CFM than typical fans and has a insulated lid that automatically closes when fan…"
21 hours ago
Tom Conlon's discussion was featured

Whole House Fans - Love 'Em or Not?

I just searched this forum for "Whole House Fan", but I didn't find much about them (except …See More
23 hours ago
Tom White shared Brandon Walton's blog post on Twitter
23 hours ago
Brandon Walton's blog post was featured

12 Things Every Home Performance Contractor Should Have on Their Work Truck

Every home is unique and differs from the last. It would be a perfect world (from a project…See More
23 hours ago
Griffin Hagle replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
yesterday
Griffin Hagle replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Kurt, Whoops, looks like I got my links mixed up. Thanks for pointing that out. Here's the…"
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service