I would think you could have an expert check that out rather than trying to get a camera for a one off, but i'm not sure.
If you have sliders that are over 10 years old, that's probably the case. I would recommend casement (crank out) windows next time if you can afford them. They are much better insulators.
Also- are the kid's rooms above a garage by any chance? If so, the heat may be escaping through a poorly insulated barrier between the garage and house.
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