It's normal for a receiver to generate heat. Just give it room to vent. They make these if that's a path you would like to consider https://www.amazon.com/AC-Infinity-Rear-Exhaust-Receivers-Components/dp/B01LW6CYEC/ref=sr_1_1?crid=3M8L98B08FLS1&keywords=avr+cooler&qid=1681391533&sprefix=avr+cooler%2Caps%2C157&sr=8-1