Why do we feel chilled in the winter but comfortable in the summer under conditions for which the same room temperature is maintained by a heating or cooling system?

We feel chilled in summer but comfortable in the summer under the same temperature because of our thermal comfort.

Thermal comfort is a function of heat loss from the body and during winter there is excessive heat loss due to heat flux.

As room temperature is fixed so summer and winter comfort cannot be attributed due to heat loss by convection. Due to differences in heat flux radiations in summer and winter there is a chilled feeling associated with winters.