We occasionally find crickets in our mostly unfinished basement. We don't often open the windows down there and we haven't noticed any unusual drafts. We don't have any dryer vents there. There are two openings for outside faucets, but they're well sealed. We do have a sump-pump but that's also sealed.
We don't really have a problem with any other insects or rodents. Just crickets (so far).
How do I find where they're entering? Is this a DIY worthy fix, or should I hire a pro?
(I have never dealt with crickets before in any capacity; they are unfamiliar to me)