Are you like me at the first of every month relishing that it is time to pull out the ladder and change your air-conditioner filters? Ok, I fibbed, I actually do this about every six months if I'm lucky. Why? Because it's one of those things that not only is hard to remember, but is a pain because I'm always missing 1-2 of the filters and have to go to Home Depot or Lowe's to buy them. Thad Tarkington and Kevin Barry were NCSU students when they came up with an e-commerce solution with an automated delivery service for air filters, and it's grown like crazy ever since.