Do dehumidifiers make the room warmer? (aka how do I cool my basement??) - AVS Forum
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post #1 of 16 Old 06-03-2007, 04:48 PM - Thread Starter
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I've nearly finished my basement home theater and it came out really, really nice but I have two big problems:

1) It's getting very humid down there.
2) It's getting a bit warm for comfort (about 71 degrees)

Today I bought a dehumidier and put it down there but to my horror after about 1 hour it raised the temperature to 76.2 degrees and it's still rising.

Since I have no windows down there I am at a loss of what to do.

My basement is split into three sections and only the first section is finished (eg. my home theater). I guess I can place the dehumidifier on the other side of the basement.

Would that solve my humidity problem? (and reduce the heat?)

I think my only air conditioning option is one of those "split" air conditioners that go on the inside of the house AND the outside (eg. kind of like a central air unit), but they cost $1500 or more plus the cost of installation.

Any advice is greatly appriciated.....
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post #2 of 16 Old 06-03-2007, 05:04 PM
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The process of pulling water from the air and getting it to condense is going to generate heat. Similar as to how your refridgerator in the process of cooling the inside, creates heat on the outside. Removing water from the air will not make the room any cooler, however, it may make it feel a little more comfortable (less muggy).

It sounds like a minisplit may be a good option or, since you have an unfinished area of the basement you could get a small HVAC unit (similar to those used in condos) and run a return and a couple supplies to your finished portion. Of course this would cost money...and involve cutting some holes in your finished theater...but it may be worth it for comfort as well as resale value.

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post #3 of 16 Old 06-03-2007, 05:05 PM
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Air conditioning is it. Converting water vapor to liquid is an exothermic reaction ... meaning heat is released in the process. If you have that much humidity, keep the dehumidifier ... the airconditioner won't need to work as hard.

Dennis Erskine CFI, CFII, MEI
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post #4 of 16 Old 06-03-2007, 06:06 PM - Thread Starter
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Quote:
Originally Posted by mbgonzomd View Post

It sounds like a minisplit may be a good option or, since you have an unfinished area of the basement you could get a small HVAC unit (similar to those used in condos) and run a return and a couple supplies to your finished portion.

What do you mean by HVAC unit? (do you have any links?)

I found a Fedders brand mini-split air conditioner for $479.99 (plus $100 shipping) which doesn't seem too bad but that price seems strange since nearly every other price is $800 or more.

My home theater is around 350 square feet so I don't even know if the 9,000 BTUs would even work well...

I wish there was a cheap option...
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post #5 of 16 Old 06-03-2007, 07:01 PM
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Quote:
Originally Posted by sofakng View Post

I wish there was a cheap option...

For HVAC that is a cheap option.

-drin

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post #6 of 16 Old 06-03-2007, 07:43 PM
 
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Do you have central air?
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post #7 of 16 Old 06-03-2007, 08:05 PM - Thread Starter
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Quote:
Originally Posted by scottyb View Post

Do you have central air?

Nope
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post #8 of 16 Old 06-03-2007, 08:21 PM
 
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I would at least try putting the dehumidifier outside your theater and run it till the humidity level is in the mid to low 50's. in the theater.
You can get a hygrometer at your hardware store to measure it.

My guess is it will fell much better without raising the temp as much. It might take a bit to get it down that low when the dehumidifier is not in the room. Put the hygrometer in the theater.

Hope this helps a little.

scott
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post #9 of 16 Old 06-04-2007, 12:31 AM
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http://www.bestbuy.com/site/olspage....=1130986343106

??


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post #10 of 16 Old 06-04-2007, 12:38 AM
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you can have it so the hose comes out a window or the door or something but only drawback is your not gonna want to leave the theater anymore. lol


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post #11 of 16 Old 06-04-2007, 05:15 AM
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If you have a window in that basement room you can use the portable shown like the one from Bestbuy. BUT it is LOUD so you won't want it running during a movie. One plan is to cool the theater really well before you use it, then have a brief intermission if needed to cool it again.
Another option if there is enough foundation above ground is take out a window and put in a thru wall AC, though the noise factor will be the same.

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post #12 of 16 Old 06-04-2007, 05:57 AM
 
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Quote:


Since I have no windows down there I am at a loss of what to do.

Oops
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post #13 of 16 Old 06-04-2007, 07:03 AM
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Call a local concrete boring company and have them price drilling a hole through the top of your foundation wall (I think your theater's in the basement, right?). Then install a mini-split using the newly cored wall to run your piping from the outside to the inside.

-drin

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post #14 of 16 Old 06-04-2007, 07:07 AM
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One thing to consider: when the air is very dry (10-20%), I'm very comfortable in a 77 degree room and cold in a 75 degree room. Before you spend the money on an AC unit, consider really letting it dry out. Run the dehumidifier a lot, seal air gaps, don't leave the door open, etc.

Once you get it really dry, you may not have to run the dehumidifier as much. Put it on a timer and run it overnight. By the time you use your theater, it may be cool and dry.

This won't work as well if water is wicking in through your basement walls at a fast rate.

However, it's easy to try before spending money on an AC.

Paul Meyer
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post #15 of 16 Old 06-04-2007, 09:23 AM - Thread Starter
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Thanks for all of the replies everybody...

Quote:
Originally Posted by scottyb View Post

I would at least try putting the dehumidifier outside your theater and run it till the humidity level is in the mid to low 50's. in the theater.
You can get a hygrometer at your hardware store to measure it.

What is the "perfect" humidity level? ...and are Hygrometers expensive? (I'm guessing that they are cheap)
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post #16 of 16 Old 06-04-2007, 07:44 PM
 
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Hygrometers are cheap.
If you can get it down to the low 50s or so I think you'll be comfortable.
It depends on the outdoor temp.
Do a google search on the topic.
Scott
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