Thanx Teddy Bear.
The original system was 3 and the house was never less then 80 in the summer, we made the jump hoping to at least be comfortable. We got no warning of the dangers of doing so. The guys who came out the other day told us the ducting was sized for 2 or 2.5, so it appears someone else already upsized before we purchased, and we upsized their upsize, just compounding the problem.
So you have a (3.5) ton system on a (2-2.5) duct system. So what's the plan by the company that discovered this?
If mold is present in the ductwork only one way to ensure it all gets removed and that's by removing it all and staring over with properly sized hvac system and a duct system that will deliver the right amount of cfm for both supply and return!
Load cal first to see what the home needs for hvac equipment and then manual d for the duct sizing. Once this things are done a estimate can be written up to correct the problem not try to fix something that is has caused the mold in the home.
I can't stress enough that I understand your problem but the only way to correct for 100% is to do the above listed. Oversized system on undersized ductwork needs to be corrected and move on. Bandaids want correct the problem. Mold is nothing to play with regardless if your are going to be saleing the home or not.
Untill you do you will still be exposed to it along with your family and real have to tell the buyers of the home when you sale it of the problems. If you correct right now will be better then waiting.
Sure is not ideal and sucks but it needs to be done regardless of the price to ensure it want happen again and that existing mold has been removed. You where dealed a bad hand but you have to know when to fold or keep playing the cards in hopes to win.
So team two came out today, promptly steered the conversation off of a dehumidifier and right back onto the complete redo of all duct work. While I understand that this is the PREMIUM solution, there a lots of times in life when, for a variety of reasons, options B, C, and D may be preferable. Is this going to be my experience with everyone... "We do it RIGHT or not at all"? I simply am not going to put that kind of money into this house at this point... is there someone else, beside AC companies, I should call? Or some other way to properly say "I am not interested in new ducts, please quote me on a dehumidifier." that allows them to still be professional? A little frustrated, taking days off work to make no progress is adding to the irritation. Any opinions? Thanx guys.
You should lesson to what all the pros are saying! If they all agree that the duct system needs to be removed and installing a new one is the best solution why would you want to try to it have a!!.
Originally Posted by SiriusDG
I wouldn't touch your home due to the following you have undersized duct work with oversized system which lead to your problem. Just adding a dehumidifier to the home will not correct the presents of mold in the ductwork. It might help but if not going to 100% fix the problem why bother?
You want the best if both worlds but don't want to pay for it. Which is your choose as its your home. I would say to you good luck and hopes it all works out but the truth is it want! You might find someone to put a bandaid on the system and tell you what you want to hear but want truly correct the probelm.
So it boils down to choose and you choose not to address the matter correctly in which I would again walk away as my name and my companies rep is on it.
Options B, C and D you talk about want correct the problem if the duct system has mold. You don't want to pay to have it done right! That might be why you are in the boat you are in with sizing of the equipment?
Sorry to be harsh but you want something done for a lower cost in hopes that it will fix your problem. In your case run the system as it stands and see what happens. You can't put a price on healthy air for you and your family. An when you go to sale remember this will come up and then what?
The problem is- anyone working on that system essentially marries it.
Mold? No friggin way am I shortcutting that job when I know what the right fix is.
So if I was bidding- it would be new ducts or nothing.
You called the pros out & don't like the answers they give.
You don't need a pro- you need a handyman who will tell you what you want to hear.
Mold is a serious threat to the health of everyone in your home, & could cause your system to be condemned to where you could no longer use your central air for either heating or cooling; a proper fix would be required.
That's a simple as someone can put it!!! It's serious and needs to be addressesd before mattes get worse along with health problems.
Originally Posted by udarrell
Do it right now and you want have to worry about it. Sure it costs more but what's your health and homes value worth to you?
OK, you have several problems, and mold is just the visible sign.
your house was designed to operate with 2.5 tons, the ductwork installed reflects this. it's old ductwork, and likely has very poor insulation, and leaks badly into the attic, which draws hot air from the attic and outdoors into the home.
the #1 solution to your situation is getting your home sealed up better, fixing the attic infiltration, and getting modern ductwork installed that has less to no leakage, and R8 insulation with a foil reflective vapor barrier that is sealed. then you can go back to a 2.5 ton a/c and have a comfortable house, with much lower power bills.
everything else is patching a problem, and you need to look at it that way.
The TRUE highest cost system is the system not installed properly...
The three big summer hearththrobs...
The A/C repairman
Same with my company also, you want it fixed-this is how to fix it right and if you don't want to fix it right we walk. Beware the company that just wants your money and will tell you anything to get it.
Originally Posted by SiriusDG
The reasons are like others stated above- we want to go in, fix it and move on. Not lets "try this", then "try that", then you're not happy and then its back to the original problem.....
Your OP stated the original size was 2.5; here you stated 3, so pardon my confusion.
Originally Posted by SiriusDG
Regardless, you got bad advice from whomever suggested an increase in tonnage was required with NO investigation into other potential causes for the existing system to perform below capacity. The harsh truth is most installed residential systems never perform close to design capacity due to poor duct installation and other improper installation practices, in addition to entrenched stupid design decisions like running ducts through an attic that gets super hot in summer. If you live in a primarily cooling climate and have no choice but to run ducts in the attic (due to lack of a basement or crawl space) then the best decision YOU can make as a homeowner is to make the attic cooler year round, along with properly sized, sealed, and installed ductwork. Approaches to cooler attics run from "cool roof" to radiant barriers to spraying foam insulation on the roof deck. The only radiant barrier that impress me are the ones glued to roof decking, so that leaves out most existing homes unless the decking is replaced during a reroof. "Cool roof" approaches are varied and not necessarily all that much more expensive than perpetuating the problem by replacing heat soaking old asphalt with heat soaking new asphalt shingles. Foaming the roof deck and sealing the attic is the most costly but will also accomplish making your house far more comfortable year round.
Of course, if you're not interested in getting your ductwork corrected to proper size and layout, I'm not sure you'd be interested in "building performance remodeling" tips, either, but these posts are read by many and someone may get a good head full of wisdom and find out first hand how smart it really is to focus on the building AND the HVAC as a holistic approach to human comfort.
- Electricity makes refrigeration happen.
- Refrigeration makes the HVAC psychrometric process happen.
- HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.
A building is NOT beautiful unless it is also comfortable.