Venus is the hottest planet in the solar system because of its thick, toxic atmosphere, mostly carbon dioxide, with clouds of sulfuric acid, that allow it to retain the sun's heat.
But these aren't just any big blankies: they're made of special textiles that reflect sunlight on the mountain away from the snow, meaning the sun's heat doesn't get absorbed into the snow and melt it.
The doors of the house, wide open from dawn until bedtime, were closed during siesta time under the pretext that the sun heated up the bedrooms and in the end they were closed for good.
When they built the Parker Solar Probe they surrounded it with a shield made out of this new material so the probe should stay protected from the sun's heat.