The latest Tweets from Greyhouse Coffee @greyhousecoffee . Northwestern Ave. West Lafayette, IN.*spread the word!* we are adding an evening time slot next week for free heads.s! come in on Tuesday from pm or from pm and get your picture .Greyhouse Coffee Supply Co. is a non profit organization started and owned by a college aged church community here at Purdueed Campus House..One less over worn card in your wallet plus more coffee cash in your metaphorical pocket. How do I sign up for a loyalty account? The only way to sign up for our loyalty program is to make an account via the Greyhouse app..