Vacuum the carpets regularly to keep dirt and dust from settling into the base of the carpet. Use a vacuum cleaner with a powerful suction, and start with a clean vacuum bag. Avoid using a vacuum cleaner with a rotating brush or beater bar.
Use door mats in front of entrance doors to absorb excess moisture and soil. Clean the mats regularly so soil isn't tracked onto the carpet.
Move heavy furniture occasionally to avoid crushing the pile. Place curtains, blinds or awnings over bright, sunny windows to protect the carpet from fading and damage from excessive sunlight and heat.
Have the carpet professionally cleaned every 12 to 18 months. Hire a reputable company experienced in cleaning Berber carpets.