If the air is dry enough, swamps coolers are cheap and easy to build. I haven’t had the chance to build a liquid desiccant system yet but it seems the tech has

If the air is dry enough, swamps coolers are cheap and easy to build. I haven’t had the chance to build a liquid desiccant system yet but it seems the tech has advanced considerably since I last surveyed 15 years ago. http://www.ailr.com/liquid-desiccant/ld-tutorial/ http://www.ailr.com/liquid-desiccant/ld-tutorial/ http://ashraemadison.org/downloads/Meeting_Presentations/jan_2014_tech_presentation.pdf http://ashraemadison.org/downloads/Meeting_Presentations/jan... https://www.nrel.gov/docs/fy99osti/24688.pdf https://www.nrel.gov/docs/fy99osti/24688.pdf https://www.nrel.gov/docs/fy13osti/56437-1.pdf https://www.nrel.gov/docs/fy13osti/56437-1.pdf