Help identify the insects I keep finding at my house (Auburn, WA)
It is a Halyomorpha halys, commonly known as a stink bug.  Your photo shows a brown marmorated stink bug.  More information can be found on this Wikipedia page. 

 

As far as your two questions:


Stink bugs do not normally bite people and are not poisonous.
A good way of controlling them in your home is by sealing any
openings that they are entering through.


Source: http://stinkbugsguide.net/facts.htm