I've been using a 2010 15" MBP with antiglare display at work in a dusty shop environment for the past 2 years. The computer is on all day attached to a 24" ACD, so the discrete graphics chip is on all day. I have a windows VM running alongside a bunch of programs on the mac doing various things. The shop gets hot and there is a lot of dust. My main concern is with heat in a 13" MBA. The fans in my 15" are on all day between 3000-5500 rpm, sometimes higher. This doesnt bother me, but the MBP has 2 fans... Im a bit less worried about heat then i am about a smaller computer with a single fan like the 13" MBA. So my question is, Would you consider swapping to a 13" MBA in this kind of environment? I really like the form factor of the 13" and im drawn to it despite not really needing to upgrade the MBP.