Actually, to be totally honest, I am a bit stumped by this one.
- If you had used 4" or 6" can lights, you could get a "trim-integrated" LED retrofit that would provide some air sealing benefit.
- However, I am not aware of an LED retrofit product for 3" cans.
- Also, since the existing bulbs are very likely halogen, it would be a fire risk to install any sort of air sealing in the can light fixture itself, especially since they are non-IC rated cans.
I would say that unless there is a 3" LED retrofit with trim integrated, there isn't much that can be done. Even if the 3" retrofit exists, the trim-integrated strategy will only reduce leakage by about 50% and is not a true solution.
That being said, you could always hire a BPI Accredited Contractor to come take a look and help determine options.
Lastly, since the air leakage is occurring in an inter-floor space, I am also not that concerned about it.
It is possible that you could try to follow the inter-floor joist bays to see where they intersect with the exterior of the home.
- Then, it would be a good idea to air seal anything accessible where the inter-floor space intersects with the ambient outdoor conditions.
- Also, any other accessible pathways from the inter-floor space to anywhere else should be air sealed.
- If this can be done, then it is a solution for the can light air leakage that does not require doing anything directly with the existing can lights.