R410. Now getting common.
Been common for years. But not anymore, new systems can't be sold with R410 next year.
https://www.carrierenterprise.com/hvac-news/what-to-know-about-the-r410-refrigerant-phase-out
Been common for years. But not anymore, new systems can't be sold with R410 next year.
https://www.carrierenterprise.com/hvac-news/what-to-know-about-the-r410-refrigerant-phase-out