How absorbtion chillers work n available in pak?

salam to all .

want to know that How absorption chillers or adsorption chillers work ? and are these available for home ? (for cooling purpose) bcz i know these are available for industries in 20 Tons to 100 tons etc but a home needs smaller units about 4 tons or so . if any one cud b helpful in replying this i wud b glad to know.

nice day

Nadeem Ahmed