it would be a good if you had it in your hands now, as of march it won't be that profitable unless bitcoin prices go high. if you are looking to make money, just buy some btc and sit on it for a year.
condensation is bad for computers, avoid placing equipment outside. Perhaps consider doing watercooling which will avoid all the loud noise as well as provide an excellent cooling solution.
What is your goal? Are you looking to make a profit? If so your current approach won't work unless you want to invest in expensive ASIC equipment. If you are doing this for a hobby and just want to support the bitcoin community than yes using your GPU and some ASIC usb miners would be perfectly fine. Don't expect to make your money back.