Thanks dkersten. I’ve decided to not use the ERV route and look at dead vents and mini split. @BigMoutinDC in dkersten’s post he mentions hiring someone to come up with a plan for me. Would you be interested in this? PM me if so.My first theater was about 1200 cubic feet and not sound proofed at all, and even with the equipment in another room, just two people and one projector made it REALLY uncomfortable after a couple hours. I installed an exhaust fan that pulled around 170 cfm out of the room opposite the door, and since the room was not sealed, relied on the gap at the bottom of the door for cooler air to come in from the hallway. It helped, but really without the A/C running it still wasn't enough.
At 2400 cu ft, if it is just you and the Mrs., circulation with the rest of the house alone will probably be fine. But when you add more people, you are going to feel the heat in the room, especially with the shorter ceiling height. Personally, I prefer to plan for the worst case scenario. I may only need to run both my circulation and my mini-split in that rare case when I invite people over for a movie, but if I don't have it, it will get stuffy in there when I need it most.
Honestly, if you are tight on time and don't feel you can DIY something yourself, then I would recommend hiring help from one of the designers that lurk around here for a detailed plan that you can give to a carpenter to build for you. I almost went that route myself and every day I wish I just had detailed plans to build from, but I am a glutton for punishment and choose to spend a ton of time researching, learning, designing, and building everything myself. Nothing wrong with skipping those steps and paying someone to do it for you, but it won't be cheap. Then again, getting it wrong and wasting all the effort to soundproof the room would be a pretty expensive mistake.
Muffling the sound is relatively easy, you can even buy duct mufflers that are prebuilt. Keeping the soundproof shell without opening your room up to flanking is the real trick. All the designs linked in this thread will accomplish that. I have seen at least 10 different designs just reading build threads, and each one is pretty specific to the situation but really they all do the same thing.
I can appreciate your desire to find the simplest and least complicated way to get this done, but frankly the ERV is not the solution for you IF you are not planning to pull in outside air with it. To reiterate, there are three major issues with using it to circulate air with the rest of the house:
One more note: A regular HVAC guy will probably not have any experience with a room like this. They are used to dealing with air quality issues and know how to circulate air in a regular house, but this is a sealed room with special considerations for sound proofing, and most of what they would do in a regular house will not work well here. Be careful when talking with them. What is acceptable for a room with a 40db noise floor will not be acceptable in a soundproofed room with a 20db noise floor.
- It is very low volume, designed to bring in a little fresh air to mix with the rest of the house, not exchange 2400 cubic feet of air a couple times an hour.
- The intake and exhaust are right next to each other, which is fine if you are piping one into the return and one into the main trunk of your HVAC, not so great if you are trying to circulate air in one room.
- The ERV's main purpose is to exchange the energy while exchanging the air, so it won't get rid of the heat in the room, it will be pumping it back in as well.
I do appreciate all the help guys, thanks.