The answer to 'rewiring gets hot' is that a common cause is improper wiring or overloaded circuits. Symptoms may include outlets or switches that feel warm to the touch, flickering lights, or tripping circuit breakers. Solutions can include checking for loose connections, upgrading outdated wiring, or redistributing electrical loads across different circuits.
If the issue persists or you are unsure of the cause, it's best to call a licensed electrician. Rewiring an entire home is a complex task that requires professional expertise to ensure safety and code compliance.