Is it too much to roll down a window?
Why are those who don't use air conditioning paying the "environmental refrigerant tax"?
How much refrigerant would be saved if vehicle air conditioning was an additional expense?
Above 30°C it's actually more comfortable to just ventilate the train instead of A/C.
Although, I'm betting the engineering side of the tram probably avoids needing anything other than the equivalent of the US PE/etc. Its probably a bit tricky because the needs of being able to load/unload people quickly also probably tend to dump a lot of hot air into the car. Either way though, busses, cars, trains all tend to do ok in hot climates because they have massively oversized AC systems and can move a lot of air relative to the enclosed space.
Returning to my original point, I'm betting your trams don't actually have AC, from your description I might guess they have some kind of evaporative cooler.
Come to Texas and drive your car with no AC and just the windows rolled down. Please, I'll let you stay at my house for the duration of the experiment just to watch you bitch about the heat. I'll even record it for your socials so you can just show everyone how amazing your idea was.
As a human, with a normal body temperature of 98.6 degrees F. If the outside air temperature is 100 degrees F, then having your windows rolled down will actually increase the speed at which your body heats up to match ambient temperatures.
This makes driving motorcycles in desert areas where air temp is > 100 degrees especially dangerous as it can quickly lead to dehydration and heat stroke.
But yah, motorcycles at speed are another thing entirely because sweat/etc can just as easily blow off as evaporate. And so, you can't drink/sweat enough to be cooled. Combined with the need to wear protective gear which also tends to stop evaporation is a deadly combination. I ride mountain bikes in 100F+ weather and its another set of dangers, and one of the best feelings is dumping cold water through the vents in a helmet and feeling the burning hot water flush down your face and be replaced by the cool. But again, i'm basically carrying a significant quantity of <40F water intended to be sprayed on my already sweaty self, along with a 32F water i'm drinking not for hydration but as coolant.
An A/C is better for the environment.
I used to live in Maryland. The summers there are brutal. On hot days, rolling down the window is like having a hair dryer pointed at your face.
I was talking with a friend of mine in Delhi, a couple of weeks back, when they were having the heat wave.
It's no joke. People are dropping dead at their workstations.
They were known as "The Blue Nomads." because their skin was often tinged blue, from the dye on the heavy wool robes they wore.
In the desert, wool actually keeps you cooler.
The people you're talking about are Amazigh, also known as Berbers, and from the indigo, specifically Tuareg.
I'm sure they were referred to as "bedouin" and it isn't wrong in context.
But in a decade or so, it will be the prevailing opinion. Some czar of the environment will go around deciding who gets AC, and telling others "You don't need AC". (Generally, this is decided by campaign donations and party support.)
Of course there is some negligible environmental impact that will come out in a college paper some point. But otherwise, the only thing people will notice is the rise in deaths of the elderly.
But this is a small price to pay. The environment is our god, and it demands sacrifice.