A glossy hard floor may hide water at seams, beneath an underlayment or along the wall perimeter. Carpet can feel less wet on top while its pad still releases water under pressure. Those conditions explain why extraction is followed by material checks. More passes over the surface cannot resolve every pocket of water sealed beneath a finish.
Reno homes can take on standing water from a thawed pipe, an appliance connection or an opening during a storm. A lower room receiving outdoor runoff brings another question: what the water carried inside. The source needs to be described before cleanup methods are selected, particularly when sewage or floodwater may be involved.
Access also affects the setup. A truck-mounted unit needs a practical route for hoses, while portable equipment can serve spaces where that route is restricted. Distance, stairs, room layout and the surface all matter. Equipment is chosen around those conditions, rather than promising one machine will be appropriate for every home.