Definitely get a bucket heater or turn up clients hot water heater full while your using there water. Hot water does help to clean faster and more thoroughly however, if you pre treat properly, agitate you will be just fine. I had this happen when my company carpet cleaning Tampa first started out and these were the steps I took.
I am totally agree with Mcatt. I never tried to clean the carpet through cold water, if you want to try then might be you can use some carpet cleaner to wash them clean. But, I would prefer to choose hot water to clean the carpet, It can easily remove stains and after washing through hot water it looks like new fresh one carpet.
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