Hello, I had a client who’s also had a penthouse but is level 12, he used glass for his canopy(enclosed) even if have bird it will be easier to clean compared to polycarbonate.
for Heat wise both is approx the same, glass have film/vacuum/colour to reflect the infra Ray from the sun, polycarbonate have heat reflector type. The heat from the window is also a huge factor, in short, even if u insulate all corners, it will be stuffy and hot inside, unless you ON your Aircon In the afternoon( which my client did Everyday) . Even if you open your window for ventilation or level 16 your wind quite strong one, the IR will still come in and heat up your room
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