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Here, it is illegal to top up without repairing the leak. Yes, 9 lbs is a lot and I bet it wasn't cheap...
Do a little research on different manufacturers AHU size. Furnaces have actually gotten shorter which is a pain when you are changing them out due to sheet metal changes and plenum adaptors. It might also be a great time to consider running two AHUs for zoning. Doing a mini split up for the upper floors and reducing the size of the central a/c might also be a consideration.
R410a phase out is to begin in 3 years but it should be available for another 10 after that for residential service. Not sure what new cocktail of refrigerant will be taking 410s place or if a conversion is possible.
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Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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