Air conditioners are not the best for the planet long term, but Europeans may need to care a bit more about themselves in the short term and start installing more of them.
Well, your problem is the sun going through the windows. They completely defeat your house insulation. Yes, you need blinds, they help a lot. Preferably, outside mounted. Like in Southern Europe. If you cannot mount them outside, look for pleated blinds. They not only your room protect from the sun, but also work as an additional insulation layer. You can also close them during winter nights to save a bit of energy.
Well, your problem is the sun going through the windows. They completely defeat your house insulation. Yes, you need blinds, they help a lot. Preferably, outside mounted. Like in Southern Europe. If you cannot mount them outside, look for pleated blinds. They not only your room protect from the sun, but also work as an additional insulation layer. You can also close them during winter nights to save a bit of energy.