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Cheap, Fast, Quality – Choose two. I would not skimp on quality when it comes to a high velocity install. They work better than conventional air when properly installed, but the install process is far less forgiving. Most HVAC guys end up cutting a few corners and this will noticeably affect system performance. I have two Spacepak systems in my house and both have had to be reworked over the years to get them perfectly dialed in. I had the first done by a traditional HVAC company (which I can’t recommend) and I did the second myself with the help of an architect.
My best recommendation is to spend a lot of time in the planning phase. Go over manual-J calcs in detail to determine precise tonnage and zones. Pre-route your supply runs and figure out how to get your returns up as high as possible in the house. If you’re not willing to invest the time and money in a good install, you’re better off going with a conventional system that even a monkey installer can’t screw up.