Thank you! So the hypothalamus induces the fever primarily by reducing heat loss, e.g. by reducing blood flow to the skin surface and cutting off the sweat response, rather than increasing mechanical or chemical thermal generation? Or is it more of "there are lots of processes in the body that contribute to heat generation and heat loss, and the hypothalamus pulls all of them simultaneously?" Or is it that there are so many interrelated processes that it's not clear exactly which levers the hypothalamus is pulling, we just know that heat generation increases and heat dissipation becomes less efficient?

Very informative and easy to understand, but the OP's question was entirely about this sentence, which you just glossed over without explanation: "This makes your body heat up, causing a fever."

What makes your body heat up? What mechanism is the hypothalamus controlling? Is is muscular contractions (shivering) or some other thermal process?