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I'd suspect the issue is more likely that the thermostat is somewhere that doesn't reflect the house temperature. My thermostat (which is within o.2 degrees of multiple thermometers including a thermopen) is in the hall where there are no radiators so it being set to 17 doesn't really mean much for room temperatures.
Stat is probably badly labelled or out of calibration or in the wrong place etc. 17 is uncomfortable unless you are pretty active.