Nope. For the reasons stated, it should be set cooler in the winter (as people are layered up) and warmer in the summer (as people likely won't even have coats/jackets on). It also represents an energy saving.Other way round. They should be set warmer in winter and cooler in summer.
It's horribly uncomfortable getting on a train that's 22C or hotter when you're wrapped up in a winter coat, and only using the trains for short journeys means you aren't going to remove coats and scarves as you'll often be off the train again within 20 minutes.