Hetty58
I had most of mine replaced - and don't like the UPVC. It's impossible to repair any frame damage (unlike wood) and they need adjusting for winter/summer as they shrink in the cold and expand in heat.
The conservatory (very old) windows are dark wood on the inside (giving a better view of the garden) but I painted them with white ranch paint outside.
You can have your UPVC windows at standard setting so you don’t have to do anything Hetty58? If you do want to maximise their effectiveness you don’t need a handyman to set them to winter mode or summer mode, you just open the window and locate the screw on the side mechanism where the handle is and set it with an Allen key, it’s really easy and only takes seconds. I take your point about not being able to repair them easily if the frame is damaged, but that’s quite unlikely. I’ve got mainly double glazed wooden windows at the moment, and I’ve found the UPVC ones far better from a maintenance perspective.