You're right, it is very different. And unlike Canada, our winters are more humid than our summers (I think January is our most humid month, we average somewhere around 20% if I remember correctly).
Though we also artificially heat our homes. As well as artificially cool them in the summer. Both sap ambient humidity.
(Funny, somewhat unrelated story, I literally didn't know that there are people who don't have air conditioning in their homes until I was 21 years old.)
My house is kept between 71 and 75 year round. Regardless of whether the outside temp is 110 or 30. Ambient humidity in my house hovers around 3-5% year round. I honestly don't think it's ever gone above 10%, or at least it hasn't since I started paying attention to it.
And I agree that PVC is better, and much easier to maintain than glass. And if you're a breeder and/or have a large collection, glass is just impractical.
But heating large tanks in a dry home is easy if you only have a couple of animals. All you need is a large CHE kept on a thermostat, spray the tank each day, and provide a humidity box.
Daily maintenance of that is a breeze compared to my dog and my fish.
And that was just as true for my big retic tank (before he outgrew it and I had a custom one built) as it is for my little 40 gallon ball python tank.
No one is saying glass is the best option. I'm just saying that it can be done, and that it can be done well.
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