The ducts are actually in amazing shape - they’re proper metal ones, and have been well insulated. Someone went through not too long ago and did some work. The unit itself is still serviceable, but we want to get rid of the gas anyway. There’s plenty of access - there’s a damned house-wide basement down there - and if bigger air delivery is needed we know that’s a probability. Weighing the pros and cons of retrofitting vs installing ceiling which would then run into my personal nightmare of wayyyy too many peopel I know who’ve had monkeys fuck their joists ramming aircon through the ceiling after the fact, plus then we would need to decomission and patch all the existing floor vents…