Communicating with Tenants who are Deaf/Hard of Hearing

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As a Deaf landlord myself, I hired a hearing (not Deaf) property manager primarily for effective communication. But I do wonder what if I were to manage them myself or hire a Deaf property manager. Now that I wondered this myself, I wonder how landlords or property managers communicate with their tenants? Do they always use the phone? Or text/email each other? Does anyone here have experience dealing with Deaf/Hard of Hearing tenants? I'd be interested to hear your stories. :-)