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Old 07-25-2010, 06:26 PM   #16
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Suggestions for attic cooling


So it sounds as if the air handler is in the attic, along with the ductwork? http://www.buildingscience.com/docum...on?full_view=1

Be safe, Gary

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Old 07-27-2010, 02:26 PM   #17
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Suggestions for attic cooling


Even with proper venting and insulation a radiant barrier is a great idea especially on an older home. Check out Enerflex radiant barrier, I saw it in Money Magazines energy section last week. Suppose to decrease attic temp by 30 degrees. Seems pretty simple to install. link to a you tube video
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Old 09-17-2010, 11:52 PM   #18
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Quote:
Originally Posted by Deckmaster View Post
Even with proper venting and insulation a radiant barrier is a great idea especially on an older home. Check out Enerflex radiant barrier, I saw it in Money Magazines energy section last week. Suppose to decrease attic temp by 30 degrees. Seems pretty simple to install. link to a you tube video
After watching that video something tells me that can't be good for the life of the shingles. Sounds like it would cook the shingles which would lead to shorter shingle life.
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Old 09-18-2010, 09:24 AM   #19
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Suggestions for attic cooling


According to the Reflective Insulation Manufactures Association's independent study, a radiant barrier may cause an increase in shingle temperature between 2-5 degrees Fahrenheit on a hot summer day. Given that shingle temperature at that time is in the range of 160-190 degrees, this increase is negligible and does not accelerate shingle degradation. Although roofing manufacturers were concerned about shingle failure in the years when radiant barriers were first used, it is no longer an issue. Roofing material warranties are not affected by the installation of radiant barriers.

Read this roof shingle temperature study for more details.
http://www.rimainternational.org/technical/tb103.html

The Florida Solar Energy Center also conducted a study on the use of radiant barriers under shingle roofs and found that properly installed radiant barriers do not void the warranty for the shingles.
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Old 09-18-2010, 04:25 PM   #20
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Suggestions for attic cooling


As far as solar power, it appears you can do hot water heating and maybe an attic fan. Do any of the solar systems generate enough power to drive air conditioning during the day? I assume you would have to be on a separate circuit.

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Old 09-18-2010, 05:44 PM   #21
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Suggestions for attic cooling


Solar powered attic fan, proper insulation and a radiant barrier are all a great start.

There are solar powered 240 W AC units, but unfortunately initial price is high ranging from $10K to $20K depending on size. Than again, if your energy bill is $800 a month it may be worth the investment. http://www.solarac.com/

My suggestion is to add a radiant barrier and solar attic fan (make sure you have enough insulation too), see how much your AC/electrical bill shrinks (I've heard some save over 50%) then decide whether your want a solar AC unit.

I know Enerflex Radiant Barrier also qualifies for a tax credit. http://www.enerflexfoil.com
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Old 09-18-2010, 06:20 PM   #22
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Before purchasing a radiant barrier, check your savings, if any, as it depends on location: http://www.ornl.gov/sci/roofs+walls/radiant/rb_02.html

http://www.advancedenergy.org/buildi...%20Studies.pdf

http://www.ronhungarter.com/black_mold.html

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Old 09-19-2010, 03:12 PM   #23
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You will save using a radiant barrier, no question.
Your savings on heating and cooling bills will vary, depending on many factors. Savings will depend on the type of radiant barrier application, the size of your house, whether it is a ranch style or a two story house, the amount of insulation in the attic, effectiveness of attic ventilation, the color of the roof, the thermostat settings, the tightness of the building envelope, the actual weather conditions, the efficiency of the heating and cooling equipment, and fuel prices. http://hvac-talk.com/vbb/showthread.php?p=7853862
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Old 09-19-2010, 08:06 PM   #24
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Ahhh. You work for them. 75% of your posts push radiant, and your sales pitch is showing.

OP, savings may be minimal and you may lose the shingle manufacturers warranty. The savings might better be used to seal any attic air leaks, add a balanced ventilation system, or just add more insulation to the minimum suggested R-value for your location. http://www.ornl.gov/sci/roofs+walls/...es.html#table4

Reflective barriers are not generally considered a good application in houses
located in climates where heating is dominant. --------- from: http://www.energyideas.org/documents...atTransfer.pdf

I could see radiant in Zones 1, 2, and parts of 3; check your location and heating degree days: http://www.nrel.gov/docs/fy00osti/26450.pdf

If you get snow, adding radiant rather than more insulation or sealing air leaks and you may get ice dams: http://www.buildingscience.com/docum...d-135-ice-dams

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Old 09-19-2010, 09:26 PM   #25
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love your thoroughness GBR
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Old 09-19-2010, 11:31 PM   #26
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Yes, I work for NASA where we invented radiant barriers. We use radiant foil suits on the space station and on our suites merely because they look cool not because they reflect heat.

House Shingles
Apparently you didn't read the info from RIMA and FSEC.
Read this roof shingle temperature study for more details.
http://www.rimainternational.org/technical/tb103.html

The Florida Solar Energy Center also conducted a study on the use of radiant barriers under shingle roofs and found that properly installed radiant barriers do not void the warranty for the shingle

Part of your post is accurate in that a radiant barrier is most effective in Southern regions where it is typically hot not cold. A radiant barrier is great for the heat, but insuilation is the first go to in the colder climates (half as effective).
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Old 09-22-2010, 08:18 PM   #27
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According to the Reflective Insulation Manufactures Association's independent study, a radiant barrier may cause an increase in shingle temperature between 2-5 degrees Fahrenheit...
Not sure I am going to take my research from an association that can monetarily benefit from this "study". There are always ways to rig a study.
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Old 09-22-2010, 08:23 PM   #28
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Originally Posted by Deckmaster View Post
Part of your post is accurate in that a radiant barrier is most effective in Southern regions where it is typically hot not cold. A radiant barrier is great for the heat, but insuilation is the first go to in the colder climates (half as effective).
I hear the same things that it is better suited for places like Arizona and Florida. Hot and Humid.

Saw this, they claim its good for winter as well since it traps the heat.

RBS Chips:
http://www.savenrg.com/1rbschip.htm
http://www.savenrg.com/winter.htm

From site:

Quote:
If you live in a cold climate and really want to mpact our heating bills, and make your home warmer in the winter and cooler in the summer, then consider installing Barrier System Chips (RBS Chips)

Keeps heat in during winter, out during the summer
Lifetime performance warranty (over 20 years of installations)
Never need to add more insulation again

Millions of reflective metalized film pieces stack on top of each other which is very effective at limiting the flow of heat
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Old 09-22-2010, 08:30 PM   #29
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My suggestion is to add a radiant barrier and solar attic fan (make sure you have enough insulation too), see how much your AC/electrical bill shrinks (I've heard some save over 50%) then decide whether your want a solar AC unit.
I ended up buying this today after much research on solar attic fans:
Attic Breeze Zephyr AB-252D-GRY

I like:
American made
Lifetime warranty
higher 25W better type monocrystalline solar panel
sealed bearings
weatherproof metal
14" fan blade
1550 CFM

Of course manufactured in USA means alot of things to different marketing folks, so I still have an email into them on if they use all american parts.

One fan will cover my 1925 sq. ft. on an 8/12 weatherwood colored roof.
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Old 09-22-2010, 09:07 PM   #30
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Suggestions for attic cooling


thanks for the update. let us know how it goes

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