Because there are several types of heat but your thermostat only measures one type.
In summer radiation is intense, heat is intense, & depending on where you are humidity can be high. High radiation causes walls to be warm. Direct sun can cause radiative heating on your body even if blinds are closed some sun gets in. So you have radiation, conduction from the walls. Convection is minimized by AC but the other elements aren’t.
In winter you have cold air outside the window. So you have radiative and conductive heat loss. Drafts develop near poorly insulated windows which is convective heat loss.
The only rooms immune from these phenomena are indoor rooms like a half bathroom or something.
The dry air also makes you feel colder but that can be solved with a humidifier. The only way to solve the colder temps is to raise the thermostat a degree or two.
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