Spider plants thrive in environments with high humidity, but they can also do fine in low humidity. However, if brown is coloring the tips of your spider plant, then it could mean the air is too dry.
SOLUTION
If your spider plant has brown curling tips, place your potted spider plant in an environment with a temperature between 60 and 80 degrees Fahrenheit.
Also be sure it's not by an air conditioner or heater vent!