Lol, the photo is of my favorite rapper T.I.
If the payback time is 5-7 years and the warranty on the item is 2-5 years depending on the make then this would be a big gambol on the reliability and longevity of the particular system you install especially given the short average life span of many products nowadays.
Hopefully a 'green' type forum would help people make a better informed decision about this kind of product.
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