Too much of a good thing...?

Got a old house in farm country. Local farmers introduced asian lady bugs to combat local pests on crops. So winter rolls around and they start to look for warmth and they end up in just about everyones house. I expected them and even welcomed them this year since I have been seeing a few spider mites. Well I think it's getting a little outta hand I have around 2 dozen chilling on the girls at what point should I start cutting their entries off? What is a healthy number per plant?

Lil bastards finally paying rent

I not 100% sure but i think that you can never have too many ladybugs. What are they eating? do you have pests in there that they might be feeding on? I have heard of people carfully collecting the ladybugs and storing in a refriderator in case you need them later on for a mite/aphid outbreak. So maybe you should save a few??