Need AirConditioner rocommendation for my HT room.... (1 Viewer)

[Luis Gabriel Gerena]

Hi!
I live rented so I can't use a regular AC so I went to K-Mart and saw a portable AC that has 9000btus. It says that the room size should be 10'x9'x8'. My room is bigger than that 14'8" x 10'4" x7'8 ". My normal HT room temperature is 83-86ºF and after 2 hours of operation (using my projector) sometimes it can go as high as 98ºF (when is a really hot day) but normally is around 93º. Heat is a killer for my projector so I would like my temperature to be as close to 80º as possible. Is it possible for this 9000btus unit to deliver in my room?
Regards

 

[Kevin Potts]

Luis,
Here is a simple formula to determine how many BTU's you'll need.
Determine the area to be heated/cooled in cubic feet, multiply by 0.133, then by the desired temperature increase/decrease to determine the required output.
So your room is approximately 1200 cubic feet and you want to cool the room about 13 degrees. (from 93 to 80)
1200 x 0.133 = 159.6
159.6 x 13 = 2074.8
This means that you would need 2074.8 BTU's to drop the temp in your room 13 degrees.
I think the 9000 btu ac unit would be more than enough, so you might look at getting a substantially smaller unit. But keep in mind that you will want to leave yourself some headroom just in case. So since you only need about 2100 btu you would probably be ahead to get around 4 or 5000.
Hope this helps.
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[Chip E]

A 5000 or 6000 BTU unit will do just fine.. plenty. I have central air and, my HT room is definately warmer than the rest of the house... so they freeze a little more, lol..
- Chip

 

[Geoff L]

Is the room closed off? No openings to other areas of the house? This will create alot of cooling loss.
Your saying, - DUH - Obviously.
If closed, yes 5000 will do but may run more than you like. Noise! They are all not so quiet! Might consider a 6000 or so, as to keep run time down, also not commiting it to work so hard, as allready mentioned...
Like audio, headroom is good.

 

[Wade H]

Yes headroom is good, but you really don't want to overdo it. An A/C unit that has too much headroom will be more expensive to operate than one that is sized for your room. That larger A/C unit may get the room cooler faster, but it will cycle on and off more - costing more. The smaller unit may not cool as quickly, but it will cycle less and be more efficient.

 

[Luis Gabriel Gerena]

If I modify the formula stated before...that means that:
1200 x 0.133 = 159.6
159.6 x 13 = 2074.8 BTUs needed
Then using this formula I could say that:
the 9000BTUs unit should theorically be able to lower the temperature of my room 56º...am I right?
calc: 9000BTUs / 159.6 = 56º

 

[Kevin Potts]

Luis,
Yes, on paper you would be able to lower the temp in your room by 56 degrees. However in real world applications it would depend on how hot/cold it was in your room to begin with. I don't think it would be possible to drop the temp in your room from 56 deg. to 0 deg. with a 9000BTU a/c. However a drop from 126 deg. to 70 deg. would be obtainable.
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