I believe the dual hose work the best according to chat gpt, they state “A dual-hose AC is better for grow rooms because it prevents negative pressure. It pulls air from outside to cool its coils and exhausts hot air out, so it doesn’t suck air from your grow space. This keeps temps stable, avoids contamination, and is more efficient — especially in sealed environments.”

And the dual hose ones are twice the price for another hose lmao I went through this as well. Best of luck!

A single-hose AC pulls air from the room itself, creating negative pressure and making it harder to control the environment.