Currently got procurve but its a bit noisy....
Disconnect/replace the fan and carefully monitor the temperature for a while?
If it's somewhere with decent airflow and isn't too heavily loaded (unlikely in a domestic environment) it'll probably be fine.
As above, I just took the lid of my switch, measures the fan(s) and replaced them with decent quality ones from OCUK that had the lowest dB ratings I could find given their size.
Don't forget, most of this corporate kit is spec'd to run in cramped wiring cupboards with no airflow. We have a switch at work in a tiny cabinet in a warm room which runs at 50ºc in the summer, yet has 5 years uptime.