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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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The technology is out there, if you want to use it.
Exactly. If you want to see where the heat is going get a thermal imagining camera .
If you want a better system you need to know what is wrong (or right) with what you have.
Imagining problems is designed to take your money and leave believing that the problem is fixed.
If you have a duct seam that split open that aerosol sealer will not help.
If you have poorly designed ducts, that aerosol sealer will not help.
But you can image how it might help.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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