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Old 06-03-2014, 12:24 AM   #1
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High-Velocity AC install question


We've been in a mid-50's rambler for a few years now. No AC at the moment, and from my looking around, it seems a high velocity AC system in our attic would be our best bet...hot water heat with a new boiler, currently no ducting, a low basement ceiling where we'd like to preserve as much headroom as possible, and my wife doesn't like the look of mini-split AC units.

I've come across a few places where I could buy the entire system, they do the system design, I do the duct and blower installation myself, and hire a pro to do the coil install & charge.

We're still a few weeks out from making any decisions, so I wanted to see if I'm thinking everything through, if there's tricky parts of installation that I may not be aware of, etc. Any input is greatly appreciated.

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Old 06-03-2014, 02:10 AM   #2
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High-Velocity AC install question


You can have a unit in the basement and have the duct work up in the joist bays.

It does help to know what the height is in the basement from floor to joists.

Keep in mind that if you locate the unit in the attic. It will have to work harder, due to how warm it gets in attic spaces.

As for mini-split units. There are different versions. Not everyone of them have an indoor unit that looks like what you see in motel rooms.

As for doing the duct and blower install yourself. Most areas, especially Mn. Do not like homeowners doing this type of work themselves.

You would actually save money if you just hire a local hvac company to do all of the work theirselves. They would first come in and get the info on how large of a unit is needed for the A/c and indoor air handler. They would also get the info needed for size of return duct work, and supply vents.

Supplies can be placed within the area of the joists. The return would have to run the length of the main support beam in the basement, which is always the best place.

Without knowing headroom of the attic. It can be very hard to properly run the duct work up there. Especially for the returns. Also keep in mind that most people complain about it always being too warm in rooms that ceiling supply vents are placed into rooms.

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Old 06-03-2014, 04:31 AM   #3
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High-Velocity AC install question


If your attic has the head room, stick with a conventional system. For the cost of a HV air handler, you can get a VS ECM air handler. And have a more efficient system.

Remember, with an HV system, you have to have your outlets in somewhat unused areas of the room. You don't want that air blowing down on you.

While HV systems are better at removing moisture then a conventional, they are not as efficient though.
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Old 06-03-2014, 08:19 AM   #4
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High-Velocity AC install question


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Originally Posted by gregzoll View Post
As for mini-split units. There are different versions. Not everyone of them have an indoor unit that looks like what you see in motel rooms.
Can you provide some direction in looking for those different versions? I haven't come across anything in my looking thus far.
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Old 06-03-2014, 08:31 AM   #5
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High-Velocity AC install question


the ones in motels are called PTAC units, packaged terminal air conditioner ( not mini split). mini splits are all the same. google ptac for more info

http://en.wikipedia.org/wiki/Package...ir_conditioner

http://www.amana-ptac.com/
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Old 06-03-2014, 08:39 AM   #6
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the ones in motels are called PTAC units, packaged terminal air conditioner ( not mini split). mini splits are all the same. google ptac for more info

http://en.wikipedia.org/wiki/Package...ir_conditioner

http://www.amana-ptac.com/
Thanks for the clarity. I've seen plenty of mini-splits and PTAC units, knew that all that I've seen is unacceptable aesthetically. Previous post made it seem like I had missed something.
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Old 06-03-2014, 08:51 AM   #7
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High-Velocity AC install question


Your best bet is a regular unit in the attic like Beenthere said if there is enough room. Trying to find a Pro to install your lines and coil is not easy as most Pros want to have the entire job and have enough higher profit work and don"t do DIY jobs because of later complaints and too many hassles etc. Mini splits are good but it gets complex when you want to do more than 1 room with them and they can be expensive if you want the good ones made by Fujitsu or Mitsubishi or Sanyo. The rest are Chineez cheap clones and may not last long.

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Last edited by yuri; 06-03-2014 at 09:04 AM.
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