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Frog

 
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Old 05-30-2019, 04:50 PM   #1
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Frog


I finished a 10' x10' room over the garage and the room is not cooling down. The room is uncomfortable warm, especially midday. The house is around 1600 sf with a 3 ton unit not including the additional 100 sf over the garage. There's a register in hallway ceiling about 1 foot from the door and a return about 10 ft away. There's a noticeable difference in temporary in hallway and stepping inside to the finished room. The new duct is about a 20 ft run from the main trunk (box). The air flow doesn't seem to be as strong as it should. However, the room has an 8ft ceiling and you can feel the air when standing directly under it.

I went into the attic and made sure the damper was completely opened. My HVAC guy hasn't returned to assess the problem yet. I wanted to see if someone had experienced this in a FROG before.
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Old 05-30-2019, 07:49 PM   #2
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Re: Frog


No frog---how about a snake????

Tom
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Old 06-05-2019, 12:52 AM   #3
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Re: Frog


Add a vented layer to the Garage roof, raise the deck with 2 x 6" and re sheath, re-shingle, metal? vent cavity, instantly cooler for decades, and might even pay for itself....

Don't forget the Vermin barriers.

Like a Range Rovers in Africa, they have Two roofs so they don't bake their drivers to death.

An electric powered roof vent fan with thermo and humidity stats would help....

Garage roof 24 x 24 ' = 576 feet, 66 square yards at 250 Watts a yard at Noon, = 8.25 Kilo Watts = ~20KBTUs of heat gain......
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Old 06-06-2019, 03:51 AM   #4
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Re: Frog


The FROG should have its own return and supply in it. And the supply should be a larger size than it would be for a 10x10 bedroom that wasn't over the garage.



So if you ran a 6" flex, go to 7" at least. And add a return to the room.
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