You and your better half could try going out at night with a flashlight, one inside and one outside and look for light coming from the opposite side. I would try with the flashlight inside shining out and outside shining in. If you see light this would be an area to seal. You may want to consider a color matching silicone caulk for inside.
Also, if you have any drains, they can get in that way, but you do not want to seal these.
Look at the sweep on the door, these do wear out and could have gaps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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