No sense of history...
Bristow operated at least seven aircraft with air-conditioning. 5 Dornier 328s and 2 Beech 200s. Okay, the wings didn't rotate but they were still operated by Bristow Helicopters Nigeria Ltd.
Then I think there was an HS-125 based at Redhill, making at least 8 aircraft by my count.
The Beeches were kind of hit-or-miss for cooling but those Dorniers had a pair of hefty air cycle machines, one for the cockpit and one for the cabin. The cockpit had those 5 CRT displays pumping out a lot of waste heat so that you really did need the air con in there. Without it it could get up to, oh, 25° in there, which was considered pretty brutal by your average Dornier Captain.
I remember once going over to look at the then-new EC-155 at Osubi. I leaned in and accidentally pushed up against the pilot's seat back cushion, which was soaked like a wet sponge with sweat. Eeeuuw! That was when it was new; I bet the cockpit smelled like a mouldy jock strap after a few months in the tropics.