It must be 25 or thirty years since I took a machine inside a building, except when cleaning banks and the like, when not even a window could be left open for hose ingress.
An extraction machine inside a building is bad news for indoor air quality - far better to expel the exhaust and its associated odours and bacteria contained in atomised droplets into outside air. Consider also that the humidity rise caused by hot damp air will inevitably extend drying times.
But then neither do I leave my machine on the van on most occasions. I prefer not to have hoses crossing public footpaths, and with a machine as light a a Jaguar (in my case a Scorpuar) it is easier to lift off the van than a pile lifter or rotary.
So the most common location is off the van in a convenient location outside the building.
Regarding the extended hose lengths that are often quoted, my view is that regardless of the extraction power of the machine, there is a loss of airflow associated with every foot of hose that the machine has to pull through. I therefore work with the shortest hose-run practical. I couple together sections with a maximum length of 25' to reach the furthest point and remove sections when they are no longer required. Aside from cleaning considerations this also reduces trip hazard and clutter.
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The JAGUAR 6.6 --"A TRUE INDUSTRIAL SYSTEM"; not a generic squirt & suck!