25+ year old is not considered a “newer” building, not for a country that is only 70 years old, with most people probably living in neighborhoods built post-statehood, or post 6 day war. I’ve lived in those types of buildings too; the “central heating” found in them ran on oil, not electricity.
By the way, Rav Shach was obviously not my acquaintance, I wrote that I heard a story about him. And he lived in Bnei Brak, where heating is not so necessary. I trust Rav Shach would have known whether it was halachically ok to use alternative sources of heating when it was necessary, and the difference between chumra and halacha.
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