Reducing sources of moisture can reduce your need for dehumidification.
Improving the drainage around the foundation of your home may result in decreased humidity in your basement. Some ways to improve drainage are:
Extend downspouts from your gutters away from the foundation of your home
Keep gutters and downspouts clear and open
Ensure that the soil slopes away from your foundation, to avoid pooling of water around your home
Avoid over-watering of foundation plantings
Ensure that clothes dryers are properly vented to the outdoors. If you do not use a clothes dryer, dry your clothes outdoors as opposed to hanging them inside for drying.
Use vent fans in bathrooms and kitchens to remove humidity at the source.
Repair leaking outdoor faucets. Not only will this help reduce humidity, but it will also save you money on your water bills!
If your home uses central air conditioning, consider installing an A/C vent in the humid space in your home and take advantage of the dehumidifying capabilities of your A/C system. This will also help with air circulation, improving airflow between humid parts of your home and drier parts.