This doesn't look like a big deal.
It's just a small crack in the putty where the AC line enters the house.
No harm, no foul. Just seal the gap.
All that is true.
However, that gap is 1/2".
It is large enough to admit mice.
And accept admission they will! That is a regular mouse highway there!
We had mice in our basement a few years ago. I did not notice them until they broke into a water jug, which leaked all over.
While investigating the jug I found droppings, and other damage, and more droppings, and more damage, and disturbed insulation in the basement wall, and more damage, and more droppings, and, well, you get it. It was Mouse Village! And not the Disney variety...
The pest guy came and showed me where they got in. My AC line looked like this one!
He said, "Don't you ever look at your own house?" Well, um, no! I'm too busy looking at other peoples' houses!
So every time I see this on a home inspection, I point it out to my clients and tell them my sad tale! (Not tail)
This doesn't look like a big deal. But it can become one! Seal the gap!
My recommendation: look around your house for small gaps mice can get into. They will take advantage! Especially in winter. Once inside they will look for anything they can eat and drink! Your house will be a regular Valhalla! So try not to give them opportunity!
Jay Markanich Real Estate Inspections, LLC
Based in Bristow, serving all of Northern Virginia.
Office (703) 330-6388 Cell (703) 585-7560