Why does my Audi A3's engine noise increase when I turn on the air conditioning?

I've noticed that whenever I turn on the air conditioning in my Audi A3, the engine noise gets significantly louder. Is this a normal occurrence or could there be a underlying issue?

This is completely normal and happens in most cars when the air conditioning is turned on. The AC compressor puts added strain on the engine, causing it to work harder and produce more noise. However, if the engine noise is excessively loud or continues even after turning off the AC, then you may want to get it checked by a mechanic.