Someone made a comment earlier in this string about Aprilaire protecting its Dealers, Sad put true. I have spent a couple of hours trying to find info online regarding the installatiion of a model 700 and justification for my HVAC contractor trying to charge $350 over the unit price for replacing a nonfunctioning model 110.
The job is definately not for the average homeowner to attempt but the information I found does not justify the charge.
I can't see any other reason to be SO secretive about their installation process other than they don't want people to realize they are being taken for a ride by their dealers.
For those interested in more information on installation try; electronicaircleaners.com