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Old 07-29-2010, 09:38 AM   #16
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Sizing Window AC For Open Room


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Originally Posted by beenthere View Post
Theater rooms. Are their own separate load, from the rest of the house. And their load varies by usage, and time of usage. The same as a sun room. So a separate unit to condition only that room. Instead of running a much larger central unit. Operates cheaper. And keeps the room comfortable, without having to readjust the registers each season.
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Let's be clear here, is this a TV room or a real theater? Everyone these days has a big TV and high wattage surround receiver in their living room (or called family room or tv room, etc.).

So is the OP's room going to be like a typical living room with the family watching TV, or a theater with 30 seats and super high power amplifiers and projector?

If it's just going to be a typical TV room used by the family, I don't see why it should be it's own separate load. On the other hand, it sounds like getting this room to work right with his central AC might not be an easy task.

However, I have never seen a window AC unit that was truly quiet, all of them make enough noise to be bothersome. I just bought a 6,000 BTU Frigidaire for my bedroom because it was said to be very quiet. Sure, it is quieter than the LG I used to have, but it's still loud and bothersome and causes me to turn the TV volume way up.
A split unit is going to be better, but still not as quiet as central AC.

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Old 07-29-2010, 09:44 AM   #17
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Sizing Window AC For Open Room


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Or does that matter since the rest of the house is already cooled?
Doesn't matter. Like you said, the rest of the house is already conditioned.

Look at the watt, or VA rating of all of your equipment in that room(if it only has volt and amp rating, multiple them together to get watts). If it has a VA rating. Use that as a watt rating. Add all of it together. And multiply by 3.413. That will give you the equipments max heat output in BTU. Add 450(400 if everybody sits still while watching TV/movies, 500 if people are active, like kids) BTUs for every person that will/can be set/sit in the room. That is your total additional BTU load you added to that room. When you made it your theater room.

Guessing the room is within a reasonable temp of the other rooms when your equipment is turned off. You only need to over come the additional BTU load you added. Some of the heat will go out of the room By traveling at ceiling height, and some cool air will come in by traveling at floor level.

A 6,000 BTU unit. Would cover 6 people, and 1,000 watts of equipment.
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Old 07-29-2010, 10:00 AM   #18
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Sizing Window AC For Open Room


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Originally Posted by Proby View Post
How DARE you use your moderator powers to reply to me in red text




Let's be clear here, is this a TV room or a real theater? Everyone these days has a big TV and high wattage surround receiver in their living room (or called family room or tv room, etc.).

So is the OP's room going to be like a typical living room with the family watching TV, or a theater with 30 seats and super high power amplifiers and projector?

If it's just going to be a typical TV room used by the family, I don't see why it should be it's own separate load. On the other hand, it sounds like getting this room to work right with his central AC might not be an easy task.

However, I have never seen a window AC unit that was truly quiet, all of them make enough noise to be bothersome. I just bought a 6,000 BTU Frigidaire for my bedroom because it was said to be very quiet. Sure, it is quieter than the LG I used to have, but it's still loud and bothersome and causes me to turn the TV volume way up.
A split unit is going to be better, but still not as quiet as central AC.
Frigidaire isn't as good as it use to be. But, then again, not much is made as good as it use to be.

The mini splits are as about as quiet as you'll get. For an individual room with its own unit.

I had one lady call me for a similar problem. The room use to be a first floor master bedroom. They converted it to a family room. It was always too hot, summer and winter. All they had was a TV(42" or so), stereo, Playstation something, and one of the X boxes. But with 4 people, and any one of those devices on, it was hot in that room.

They opted for a window unit. And to make the hydronic heat in that room a slave to the zoned heating system.

This was a mansion.
It had been built by the Armstrong's, of now Armstrong world industries. The previous years renovations, included 30,00 bucks for the installation of 2 central A/C units. But they hadn't planned on making this room, and entertainment room at that time.

The people had money, but opted for the window unit. Since it was a room at the back of the house, where most people wouldn't see it.

They were happy not to have to run a 5 ton unit just to cool that one room.

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