Apartment with good heat/cold insulation in Kansai

I've just had a Zoom call with a real estate agent from Osaka, and I was told that apartments with ペアグラス, which I believe is commonly associated with good insulation from outside weather are more commonly found in Hokkaido and not so much in Kansai. Is this true? Should I just find a place with good floor heating then?

by NefariousnessFun3026

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