The thermal efficiency of a traditional roof window is poor compared to that of a tubular daylighting system; in winter, heat will escape through the large aperture in your ceiling, whereas in summer you are likely to suffer from solar gain (heat build-up).
Solatube Daylighting Systems have excellent insulation properties with u-values of just 1.3 W/m²K — better than many double-glazed windows.* Furthermore, they are double-glazed at ceiling level (not roof level) to prevent your expensive heated (or cooled) air escaping from the room below into the roof void.
A further benefit is their acoustic insulation; rain falling onto traditional roof windows can be very noisy, yet is almost undiscernable with tubular daylighting systems. And If security is a consideration, then our daylighting systems are a far safer bet than a traditional roof window as our polycarbonate dome material is considerably stronger than glass — and many times stronger than acrylic!
* The award-winning Energy Care Optima™ add-on enhancement is available to provide even greater thermal efficiency for your Solatube Daylighting System, with u-values as low as 0.5 W/m²K — that’s passive house standard!