Are you having overheating issues? If not why create problems for yourself.
It's really quite surprising how poorly cooled and airflow choked a case can be without causing issues, particularly at stock speeds.
On my main gaming PC I have 2 14cm intake fans, a mesh front, and two 12cm outlet fans, it runs nice and cool. On a friends PC that I help maintain he has no case fans, a case design that puts the PSU covering and almost touching half of the CPU stock cooling fan, and a system normally clogged with dust and fluff. And yet he ran his PC for 9 years like that as a gamer and has now shoehorned an i5 into the same case for the last year. It runs just fine, much to my amazement.
Good airflow and low temps are Ideal, but unless you are pushing for a maximum overclock or loading your CPU up to 100% regularly it's often not worth worrying about.