Propane, as a refrigerant can reduce global temperatures by 3 degrees
There are expected to be 3.7 billion air conditioners in operation by 2050. Using propane as the refrigerant could prevent a significant amount of climate warming by the end of the century
https://www.newscientist.com/article/2333798-using-propane-in-air-conditioners-could-prevent-0-1c-of-warming/
https://prospect.org/environment/hank-hill-solution-to-climate-change/
https://time.com/6242545/high-energy-bills/
https://www.theguardian.com/us-news/2023/may/03/new-york-renewable-energy-public-utilities
https://www.architectmagazine.com/technology/architectural-detail/beach-resorts-chp-system-proves-its-worth-during-hurricane
https://www.foxnews.com/opinion/bidens-cold-war-anti-air-conditioner-regulations-keep-piling-up