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Old 04-21-2010, 06:39 AM   #16
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Attic installed air handler


I have to disagree also.

As a home owner and not in the HVAC business, installing the air handler in the attic or crawl space is a big mistake. I too have replaced an air handler do to corrosion.

Sure, you can place the air handler anywhere. Depends upon your motivation I guess. Good for business it replacing those every few years? And I really don't understand why the duct work would be insulated to R8 but the big AH box is at R2 or 3 at best.

Nope, doesn't make ANY sense to me.

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Old 04-21-2010, 06:59 AM   #17
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Attic installed air handler


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Originally Posted by COLDIRON View Post
As already mentioned just tighten everything up in the entire system.

Seal all ducts, trunks, openings around ductwork, keep filter clean, keep return air system sealed so as to not suck hot attic air in the system.

Like I said there are millions of air handlers in attics around the country in all kinds of climates that operate just fine.

Good Luck

I am in Austin Tx today at a national energy performance seminar. Strange how all the engineers disagree with you on this. Yes codes allow it. but the unit is fighting to work. Temps in an attic can reach 180 and more. The unit now needs to work in these temps, and with 70% of ducts leaking (this is the stats) this hot air needs to be cooled making the unit work much harder.

Bottom line....
Ductwork and equipment is BEST to be in conditioned space. And server energy loss will incur when it is not. Go to any home improvemnt semniar in the country and someone will have a display showing them spray foaming the attic to fix the work by this type of Posting's advise.
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Old 04-21-2010, 07:02 AM   #18
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Attic installed air handler


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Originally Posted by Earnie View Post
I have to disagree also.

As a home owner and not in the HVAC business, installing the air handler in the attic or crawl space is a big mistake. I too have replaced an air handler do to corrosion.

That corrosion, is from using the wrong air handler.

Sure, you can place the air handler anywhere. Depends upon your motivation I guess. Good for business it replacing those every few years? And I really don't understand why the duct work would be insulated to R8 but the big AH box is at R2 or 3 at best.

Nope, doesn't make ANY sense to me.
Air handlers for attics and crawlspaces, have R values of 6 or better.
You or who ever installed it, used the wrong air handler.
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Old 04-21-2010, 07:06 AM   #19
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Originally Posted by Bob Mariani View Post
Bottom line....
Ductwork and equipment is BEST to be in conditioned space. And server energy loss will incur when it is not. Go to any home improvemnt semniar in the country and someone will have a display showing them spray foaming the attic to fix the work by this type of Posting's advise.
Spray foaming the attic is becoming more common even at houses with the equipment and duck work in the conditioned space.

Knocks off 1000's of BTUs for both the heating and cooling load of the house.
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Old 04-21-2010, 07:29 AM   #20
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Attic installed air handler


Air handlers for attics and crawlspaces, have R values of 6 or better.
You or who ever installed it, used the wrong air handler.


BT, I do remember you pointing that out to me in another post.

I will be sure to mention it to the HVAC company next time they come out to once again replace the rusted AH.
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Old 04-21-2010, 07:49 AM   #21
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Attic installed air handler


Factory and distributor sales reps often fail to mention this to companies.
So many don't know that air handlers for unconditioned space have more insulation in them.

One thing that can be done for air handlers that have R4.2 insulation. And are installed in unconditioned spaces. Is to add insulation to the outside of the jacket. Specially to the bottom of the air handler.

Air handlers with a short blower off delay. End up with the cold air from the coil laying on the bottom of the inside of the air handler. Making the exposed jacket bottom very cold. And causing a lot of condensation to form.

Adding any insulation to the bottom(bubble wrap, 1/2 fiberglass wrap, etc), will stop that condensate from forming. And extend the life of the jacket/air handler.

In an area that has an outdoor condition of 95 and 60%RH. An air handler and or duct work in an unconditioned attic will sweat if their surface temp drops below 79F.
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Old 04-21-2010, 09:42 AM   #22
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Attic installed air handler


To each their own.

I have been installing air handlers in attics for 40 years, no problems other than getting to them sometimes because of space limitations.

To beenthere.
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Old 04-21-2010, 04:49 PM   #23
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Originally Posted by COLDIRON;I431489
To each their own.

I have been installing air handlers in attics for 40 years, no problems other than getting to them sometimes because of space limitations.

To beenthere.
I appreciate very much contractors with this attitude. It keeps me if business fixing houses.

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Old 04-23-2010, 12:41 PM   #24
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Attic installed air handler


Bob you got it wrong it's not an attitude it's the way it's done in the HVAC business.

So please lighten up and keep on remodeling and answering op questions I respect your opinion.
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Old 04-24-2010, 06:37 AM   #25
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Attic installed air handler


Then the "HVAC business" needs a paradigm shift.

The attitude, "that's the way it's been done for forty years" no longer applies. HVAC is deep in math and science and those in the business need to adapt to it through education and application.

Applies to home builders and home designers too. They are the ones leaving out the HVAC mechanical room/closet and conditioned ductway.
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Old 04-24-2010, 06:43 AM   #26
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Then the "HVAC business" needs a paradigm shift.



Applies to home builders and home designers too. They are the ones leaving out the HVAC mechanical room/closet and conditioned ductway.
All they have to do. Is seal and insulate the attic. Then it becomes a conditioned space.

No duct loss or gain.

Foaming the attic is the best way.
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Old 04-25-2010, 09:32 AM   #27
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Attic installed air handler


one speaker the other day from the Canadian Home Mortgage says that it is even illegal to do this in Canada. It really is bad that so many other countries are more advanced then we are in the US>
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Old 04-25-2010, 09:38 AM   #28
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one speaker the other day from the Canadian Home Mortgage says that it is even illegal to do this in Canada. It really is bad that so many other countries are more advanced then we are in the US>
There's millions of speakers out there telling people what to do and not what to do that's why they are called speakers they speak for a living I install Air Conditioner's. I don't go around speaking on how to because it took too many years to learn the trade.
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Old 04-25-2010, 11:54 AM   #29
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Attic installed air handler


[quote=Earnie;431409]I have to disagree also.


Last edited by COLDIRON; 04-26-2010 at 06:51 AM. Reason: WRONG iNFORMATION
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