I used to use smcFanControl but for some reason it was not working at all with my 2013 MBA.
I ended up trying the trial for iStat Menus and I bought it. For me, it did two things I desperately needed:
1) It provided system stats right in menu bar (a replacement for the old istat pro dashboard widget)
2) Fan control actually worked.
If you aren't interested in #1, you can disable everything except fan control. It wasn't that expensive and it is well worth the money.
To r0k, sometimes fan control is needed. For example, when I'm working on programming or playing a game (both of which cause temps to rise > 80 degrees), i'll run the fan at medium (~4400 RPM). If it still doesn't help, i'll run it at full speed (~6400 RPM).
I've done this for years for various macs and I've never had an issue. I do recognize the fans could conceivably die faster but I'll take that risk.