Liquid cooling requires similar if not slightly more maintenance as air cooling. One aspect to remember is you still need to keep your fans clean to operate at optimum efficiency.
Ask yourself a few questions first before making the investment in liquid cooling.
Are you going to overclock any of your hardware?
Are you content with a closed CPU cooling? Such as a Corsair Hydro
or a complete closed loop?
Liquid cooling, building a fully closed loop with reservoir, pump, radiator and tubing can be costly. However, the slight difference in temperatures is often up to experimentation.
So, what are you actually looking at from a liquid cooling setup?