Correct size of humidifier

I'm looking into adding a dehumidifier to a grow room sized 7ft x 4ft x 9ft tall and need advise on what capacity dehumidifier to purchase.

RH is running 55-60%, temp 85-88f on a closed system with co2, window ac 5k btu, 1k light vented outside.

Any and all experienced opinions appreciated.

Any size standard dehumidifier from 45 up should do fine for that size space. I run a 65 pt in a space about double that size with 12 big plants and don't have any humidity issues.

The room is sealed with ac, co2 and air cooled hoods, 2k hps and 8' x 8' x 8'h.