I recommend the Velux dealer found at the Markets of Marion (Sky tech) Here is why:
Velux offers more optional upgrades that are not available from the Solar guys, most notably the high efficiency option. With this you get an additional two panes at the interior seal. Both manufacturers have double panes but with the high efficiency option you will have four.
Having said this all four give you the U rating (this is an 'R' rating for windows) of the cheapest windows. Without the high efficiency option the solar tubes have a horrid U rating.
Think about this you could have a virtual hole in your ceiling without getting the most effective solar tube available.
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