Nov 13

Cabine temp hot NNC - why 290 kts at level off?

Hi folks,

For Cabin temp hot NNC at step 24 there is written: “Maintain 290 knots minimum. Flight deck and passenger cabin temperature can increase rapidly at speeds below 290 knots.”

Any idea why? Previous steps were to switch PACK OFF (L or R depending where is hot), Trim Air off... Ram Air door closes with Pack OFF so in what way 290 kts helps keep temperature lower?