If they have techs they don't want to sell you parts, they want to sell you service. Granger sells parts. Would you call up restaurants trying to buy a raw potato?
I actually mostly called up HVAC supply places but they wouldn't sell me a cap and offered to refer me to one of their "preferred" service providers. Maybe it's some backdoor colluding in my area, who knows, but yeah I was really surprised they wouldn't. I think I called 3-4 before someone told me Grainger sells 'em.
