The equipment should have enough vacuum power to allow the carpet to dry within 12 hours of cleaning. You should always avoid rental units found in retail and grocery stores that don't have the power to extract the cleaning solution from the carpet fast enough, as it can actually damage the carpet due to over wetting. Before you begin to put the carpet down, you should always estimate how many pieces you will need, and then call around to find a store that has enough samples for the room. Although the samples will range in size at different stores, the average is 18 X 18 inches. If you use pieces that are the same size, you'll find things to be much easier. These units are very powerful, delivering hot water and generating a high vacuum recovery that can be powered by diesel fuel, gas, propane, or even by the motor of the truck. Most carpet manufacturers, fiber producers, and professional cleaners endorse this process for achieving soil removal efficiency. You can also choose a vacuum that uses stronger chemicals and a stronger suction to get dirt up. For your needs, you should choose the vacuum accordingly. Once you know your options, talk to family and friends for their recommendations. There are several places on the internet that offer reviews for local as well as nationwide carpet cleaners. A great way to ensure a professional installation of your carpet is to buy from an authorized carpet retailer or dealer. Most of the time, your carpet retailer will have an installation staff that is very experienced with installing carpet. If the retailer doesn't offer an installation service, they can still guide you to a reputable and experienced installer. Vegetable and protein fibers share the common disadvantage that they are both very absorbent and will have extended drying times when wet cleaned - which can lead to mildew, shrinkage, and even dry rot. Wool Wool fiber is produced from the fleece of lambs or sheep. Wool of carpet is imported from countries such as England, Australia, and New Zealand.