Colds not too hard to deal with at all. As the other poster mentioned, when outside, the trick is layers.
Inside, it’s actually very easy to trap heat. Knowing where and how it dissipates in a house makes a huge difference, but it’s generally much easier to heat a place than cool it.
I actually read an article yesterday that stated apparently siestas are are dying thing, as they result in more work and less sleep.
https://edition.cnn.com/travel/spain-late-night-culture-end/index.html