Both methods have their place, but they're not interchangeable. Here's the real difference and which one fits your situation.
"Steam cleaning" and "dry cleaning" get marketed as competing options for carpet care, but they're built for different situations, not simply better-or-worse versions of the same process.
Despite the name, steam cleaning is really hot water extraction: heated water and cleaning solution injected into the carpet under pressure, then extracted back out along with the dirt it loosened. The heat breaks down oils and set-in stains that cold or lukewarm water can't fully touch, and truck-mounted equipment produces far more heat and suction than a portable version.
Low-moisture methods use a specialized compound or minimal-moisture encapsulation process that works primarily at the surface level, with much faster drying time since there's little to no water to extract afterward. This makes it a reasonable option for carpet that genuinely can't tolerate moisture, or for situations where extremely fast turnaround is the priority.
Dry compound cleaning generally doesn't reach soil embedded as deeply in the fiber as hot water extraction does, since there's less moisture and pressure doing the work. Hot water extraction, if done with weak equipment or too much water and not enough suction, can leave carpet damp for a day or more, which is the complaint people associate with "steam cleaning" when it's really a sign of underpowered equipment rather than the method itself.
For most homes and most carpet types, properly executed truck-mounted hot water extraction produces a deeper clean because the combination of heat and pressure reaches soil that a surface-level dry method leaves behind. Dry cleaning has a real place for carpet that specifically can't handle moisture or for situations needing extremely fast reoccupancy, but it's the exception rather than the default for routine cleaning.
Not with properly calibrated truck-mounted equipment; shrinkage issues typically come from over-wetting with weaker rental machines.
Dry methods are often walkable almost immediately, while steam cleaning with proper extraction is usually dry within two to four hours.
Yes, though for most standard household carpet, hot water extraction produces a more thorough clean when moisture isn't a specific concern.
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