This is so strange! I have the same bugs. They crawl all over my house but it's brick! I can't figure out what they are either! I've been on here all day looking at pictures of bugs but I don't even know where to begin! They don't get on my neighbors houses either! I hope someone will answer this question! They are starting to gross me out!
Well, they are one of probably 3 common bugs. Either boxelder bugs, black & red stink bugs OR, if you have a Goldenrain tree or Chinaberry tree, that are probably Jadera haematoloma, which is also called the red-shouldered bug. Hope that helps. If it's a red shoulder bug, they are just seed-eating bugs and the only way to rid yourself of them is to cut down the tree they are eating off of.