I'm a first-time homeowner trying to make some repairs around the house. I've noticed that there's a pretty big hole around the A/C pipe where it enters the house, and I'm not really sure how to seal it up. Should I use something like foam filler, pre-mixed stucco, or is there a better option?
3 Answers
For sealing that hole, I recommend using spray foam to fill the gap and then covering it with a line set. It's a good way to ensure it's airtight and keeps out moisture.
I've seen HVAC guys use Dynaflex 230 clear silicone for these situations. They just fill it in pretty generously. Another option is "Plug Duct Seal Compound" if you want a more professional seal.
Spray foam is a solid choice, and then you can cover it with something like a dryer vent cap to finish it off neatly.