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I agree that 49 dB is too loud. I had one of these in a small computer room, where it had to run on high in the summer, and it was very noticeable -- much too loud for a theatre.


That is why I am using the ducted version, to get the evaporator fan noise outside the soundproof envelope, using oversized flexble duct and registers.


My room will be about 20 x22 x 9.5, and will use a 12000 btu/hr ( 1 Ton) heat pump unit., with 2 10" diam supply ducts, and 2 10" return ducts. Climate here is very temperate, so it doesn't require a lot of tonnage.
 

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Quote:
Originally Posted by LeBon  /t/1468993/the-retirment-dream-home-theater/30#post_23252189


Erskine Group specifies NC20 for the HVAC system noise. Here is a reference for what that means in terms of SPL vs. Frequency curves.

http://www.engineeringtoolbox.com/nc-noise-criterion-d_725.html

It's actually NC20 for the room, with all mechanical systems in full operation including noise coming from the projector itself, but primarily from the HVAC and any outside noises getting in to the theater, such as street traffic, the outside condensing unit, etc.



Bill - they make ducted mini-split systems that locate all the noisy stuff from the system to outside the room. But I have to say....considering you are building new and the house is still in framing, why aren't you simply installing an appropriately sized standard HVAC system dedicated for this room instead of worrying about the noise of an in-room mini-split???? You would probably have to get a dual stage unit with a variable speed fan to get sufficient run times, but you'd have the overhead capacity ready to go for a packed theater in the middle of the hottest summer day.
 

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I would stay away from the ductless or the mini-split system. We have those on a couple of buildings where I work to cool the telecom rooms. They are loud and the evaporator unit that is mounted inside the room leaks condensate every so often. The condensate reservoir is very small and if there is a lot of heat in that room, the reservoir will fill up and leak. Since you live in Georgia, I would suspect that it gets very humid in that part of the country. If the area you live in has high humidity, you are going to need a system that will easily cool the space while you and your family are enjoying a movie. Remember, the human body produces a lot of BTU’s of heat. There are HVAC systems called self contained or package air conditioners. These are a self contained AC or heat pump system with connections for supply and return duct work. The unit is mounted outside and the duct work is run outside to the conditioned space. So, all you see inside is the supply and return registers. There is no sound, no leaks, and is easy to work on. There is no fan, no evaporator coil inside the space. Trane, Goodman, Lennox, and York all make package system. I would check into this kind of system. They are the same price and the best part is, they come ready to run. They come with a full charge of R410a and easy to install.



Here is a link to Goodman to show you what I am talking about. Now, This may be waaaay to much cooling for what you want, but I am just trying to show you what I am talking about. I think they make smaller units, you will just have to ask around. I have seen many home owners have these installed. Down in Arizona and Nevada, these are mostly mounted on the roof of most residential homes because it gets so hot down there.

http://www.goodmanmfg.com/CommercialProducts/PackagedUnits/tabid/1265/Default.aspx
 

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Quote:
Originally Posted by JoeBlow74  /t/1468993/the-retirment-dream-home-theater/30#post_23259515


I would stay away from the ductless or the mini-split system. We have those on a couple of buildings where I work to cool the telecom rooms. They are loud and the evaporator unit that is mounted inside the room leaks condensate every so often. The condensate reservoir is very small and if there is a lot of heat in that room, the reservoir will fill up and leak. Since you live in Georgia, I would suspect that it gets very humid in that part of the country. If the area you live in has high humidity, you are going to need a system that will easily cool the space while you and your family are enjoying a movie. Remember, the human body produces a lot of BTU’s of heat. There are HVAC systems called self contained or package air conditioners. These are a self contained AC or heat pump system with connections for supply and return duct work. The unit is mounted outside and the duct work is run outside to the conditioned space. So, all you see inside is the supply and return registers. There is no sound, no leaks, and is easy to work on. There is no fan, no evaporator coil inside the space. Trane, Goodman, Lennox, and York all make package system. I would check into this kind of system. They are the same price and the best part is, they come ready to run. They come with a full charge of R410a and easy to install.



Here is a link to Goodman to show you what I am talking about. Now, This may be waaaay to much cooling for what you want, but I am just trying to show you what I am talking about. I think they make smaller units, you will just have to ask around. I have seen many home owners have these installed. Down in Arizona and Nevada, these are mostly mounted on the roof of most residential homes because it gets so hot down there.

http://www.goodmanmfg.com/CommercialProducts/PackagedUnits/tabid/1265/Default.aspx

A ducted system if properly designed and installed can be better. A minisplit is probably cheaper though and they are easier to get in small capacities. Condensate should not go to an internal reservoir, it should be routed to an external drain. The cheap units are noisy but not the good ones from Fujitsu, Daikin, Mitsubishi.
 

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Quote:
Originally Posted by Brad Horstkotte  /t/1468993/the-retirment-dream-home-theater/30#post_23250470


19-22 dB would be quieter than the fan on the majority (if not all) projectors, on low bulb. As long as you don't mount it right next to your head, you shouldn't be able to hear it - based on specs anyway. The Mitsubishi Mr. Slim seems to be a popular choice among AVS theater builders (among those who use Mini Splits), maybe an owner of one will chime in with personal experience.

I have a Mr. Slim. Yes you can hear it but it is super quiet and once a movie is on inaudible. My SIM2 projector is way louder.
 

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Quote:
Originally Posted by LeBon  /t/1468993/the-retirment-dream-home-theater/30#post_23260290


Mitubishi has a ducted option for their Mr. Slim split units, also. That's what is spec'd in my planned room. The evaporator/fan unit SPL is spec'd at 23 dB(A) on low speed, and 33 dB(A) on hi speed. But you put that outside the room, so it should work fine.

Yes they do, and if you do it that way you can also include fresh air into the system. The in room mini-splits, you can't do that, and if your room is sealed up there isn't much air moving in and out!
 

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Discussion Starter #49

Quote:
Originally Posted by Nyal Mellor  /t/1468993/the-retirment-dream-home-theater/30#post_23260325


Yes they do, and if you do it that way you can also include fresh air into the system. The in room mini-splits, you can't do that, and if your room is sealed up there isn't much air moving in and out!
how do you introduce fresh air that way?
 

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Nice! everything is looking colossal!
 
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