Air conditioning question for the scientists

Air conditioners cost U.S. homeowners a total of about $29 billion per year, according to the Department of Energy. They also release about 117 million metric tons of carbon dioxide into the air on an annual basis.

https://realestate.usnews.com/real-estate/slideshows/6-alternatives-to-traditional-air-conditioning

I don't want to contribute to carbon dioxide emissions.

This article mentions an evaporative or swamp cooler:

Evaporative cooler or swamp cooler
In dry climates, an evaporative or swamp cooler is a common option. With a fan and water-soaked sponge or pad, air is blown by the fan through the pad, allowing the water-cooled air to blow into the room or the rest of the house. To cool the house and manage the temperature from room to room, you crack windows to allow the hot air to escape, leaving the cooled air.

Advantage: With a fan and small amount of water use while running, a swamp cooler is much cheaper to operate than refrigerant air conditioning. You’ll be pleased with lower utility bills.

Disadvantage: With water serving as a cooling factor, a swamp cooler, which is often installed on the roof, only works where humidity is low. For example, at 50% relative humidity, you’re able to achieve around a 10-degree difference. The more humid the air is, the less effectively you’re able to cool.

Cost: Home improvement network and information company Angi reports most swamp cooler installations cost between $1,402 and $3,454.

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I'm in a town/province that is pretty dry (not much humidity).

Do you think this is a good way for me to go? I would just be doing the bedroom. My husband already has problems sleeping and with the current and expected heat waves, I'm trying to think of ways to cool the room down.

Thanks for any and all advice/opinions.