The phrase "dryer hookups" refers to the electrical and plumbing connections that are required in order to connect a clothes dryer to a power source and to a vent for releasing hot air. Full definition
New hardwood floors, washer and dryer hookup in basement. (redfin.com)
If the units also have an electric dryer hookup and electric hot water, and they only have a 100 A service, adding electric space heating might pop a breaker. (biggerpockets.com)
There are washer / dryer hookups under the stairs, so it would be very easy to put in a washer / dryer combo unit. (tumbleweedhouses.com)