Just plate all of the roofs with gold. That'll keep the sun's rays from magnifying into a laser. Works for astronauts (did learn recently that it actually does help offer some protection from heat and (mostly) radiation in space, as the below link can help explain).
Actually, this may be a tenable solution. If sapphires are plentiful enough that no one would think it awkward to make cupcakes out of them (the episode "The Secret of my Excess"), it may not be a far stretch for gold to be an uncommon, or even somewhat common, metal instead of a rare metal.
Only real hitch would be how blinding direct sunlight reflected off of a metal surface would be (maybe they could put a glass tint on top of the foil as is done with tinted car windows).
Err.... That was more rambling than expected. In any case, funny comic. The faces in particular are very expressive and tell a lot of the story.
I bet the Crystal Empire's sunrise is especially magnificent, especially since its more rare up North than any other place on the planet (save the South Pole). After all, the Empire is so far North and effectively creates Equestria's version of the Aurora Borealis, sso urely that also means that its days and nights become longer or shorter with the passing of the days, months and seasons. I'm not exactly sure how it all works, but hopefully sunrises are rare enough that this doesn't happen too often.
... and now I'm thinking, is the Crystal Empire really located in Equestria's equivalent to the North Pole. And for American viewers, who lives in a magical place in the North Pole? Who else but Santa Clause! Does this make Cadence their equivalent to Santa? And Shining Ms. Claus?