I used to live above someone who had their heating on all year. 30 degrees (100F) and they're still cranking it out - made summers even worse especially as it's a modern building with all the proper insulation in walls and roofs.
On the plus side my heating bills for winter were minuscule e.g. that recent winter with the massive snowfall I turned a radiator on just once for about an hour for the whole winter!

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