Skywalker,
The main difference from an operational point of view is time. No matter how big the carpet, and most rooms are over 1,000 sq yds, some as big as 1,600, you only have 3.5 hours to get it clean and get out of there, and of course the carpet has to be dry. This is where speed and high quality, the chalk and cheese of carpet cleaning meet each other head on and with the right technology, the best chemicals and a great team, quality always wins. And you can't go to the client and say, 'oh, my machine broke, can I come back tomorrow.' so every piece of your equipment has to be the very best money can buy, because in that 3.5 hour window everything has to work or we're in trouble.
It's only carpet cleaning, but in a completely different world.
Simon