I am not an average Speedfan user but will weigh in anyway because I know a fair amount about the subject. Speedfan is a great bit of freeware for monitoring chassis and CPU fan speeds and mostly best for monitoring temperatures. Some use it to adjust fan speed but I prefer that fan speeds are regulated based upon temperature in the BIOS.
To me there is always a tradeoff between noise and temperature. Spooling up fans to create a cool computer makes noise. My objective for personal computing is creating the best noise to performance ratio. I like a powerful computer that is whisper quiet. So choose your case wisely...one that flows well but damps sound. Best thing you can do is choose a large CPU heat sink which naturally cools better and of course uber silent fans with ball bearings. Lastly with the warm summer approaching, never lose sight of the fact that ambient temperature dramatically affects CPU, GPU and motherboard temps so keep an eye on computer temps in the summer months in particular.
Ride safely.