Been having some pub talk earlier today with my siblings and we got a discussion going regarding how cold our cars are in the morning. Some have a solid roof, some have a pano roof then some have twin sunroofs. But I am thinking that a solid roof will give you better insulation to an indentical vehicle that has a pano/sunroof fitted.

What do you guys reckon  MY14 Kahn Converted Dynamic - Fuji White Ebony/Pimento Interior
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Dunno the correct answer but my thoughts would be that the glass in the sunroof is thicker than the tin of a roof. Will the glass conduct heat quicker than a bit of tin? No idea. However the tin roof will have a full length liner providing extra insulation. The sunroof may have the screens that pull across which could provide an element of insulation. So which is better? Still no idea. However if you stuff a bit of expanded polystyrene between the sunroof and the pull across screen I recon that would be better. Alternatively keep the whole car in a heated garage  FL2 Metropolis, Loire Blue, ebony/ivory

Pretty obvious that a solid roof has insulation under the metal roof versus a single sheet of glass. that's without discussions about black body radiation and Boltzman's constant of course. 3 x FL1 2 manual + 1 auto
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I've had both, didn't notice much difference, especially when I pulled my big insulated blind over.  21MY Defender 90 S 3.0 D200

Wife's last car had big double sunroof and retractable blinds, my previous was a convertible with a good level of insulation.. I can't say I noticed one being colder than the other. Until I took the roof off. Current has full metal roof.car stays outside and still feels cold at silly o clock in the morning.

What I haven't seen is frost on the inside of the windscreen for years. That was always a bummer scraping both sides.

Gav.