I have a storm, it's a great bit of kit.
Heat makes a massive difference in cleaning. Until you clean with heat you won't realise how much.
Remember the cleaning pie "CHAT"
Chemical, HEAT, agitation & time if you take one away you have to compensate with more of others I.e higher ph, agitate carpet to death, longer dwell.
Why do truckmounts generate so much heat? Why do good suppliers have built in heaters on there machines or supply inline heaters?