how to install crawl space dehumidifier

Installing a crawl space dehumidifier is essential for controlling moisture levels in your crawl space, which can help prevent mold growth and structural damage. Here’s a step-by-step guide on how to install a crawl space dehumidifier:

Materials You’ll Need:

  • Crawl space dehumidifier unit
  • Drainage hose (if required)
  • PVC pipe (if required)
  • Electrical extension cord (if needed)
  • Screwdriver
  • Wrench
  • Drill with masonry bits (if securing to a wall)
  • Mounting brackets (if necessary)
  • Plastic vapor barrier or encapsulation material (optional)
  • Insulated ductwork (if required)
  • Safety gear (gloves, safety glasses)


  1. Choose the Location:
    • Select a central location in your crawl space for the dehumidifier. This should be an area with good air circulation and easy access to a power outlet.
  2. Prepare the Crawl Space:
    • Clear any debris, dirt, or obstructions around the chosen installation spot. Ensure the crawl space is dry and clean.
  3. Mount the Dehumidifier:
    • Some dehumidifiers come with wall-mounting brackets. If so, attach the brackets securely to the crawl space wall using screws and anchors.
    • Place the dehumidifier on the brackets and secure it in place.
  4. Connect Drainage (if needed):
    • Depending on the dehumidifier model, you may need to connect a drainage hose or PVC pipe to carry away the collected moisture. Check the manufacturer’s instructions for specifics.
    • Ensure the drainage system directs water away from the crawl space and towards a suitable outlet, such as a sump pump or a designated drainage area.
  5. Connect the Power:
    • Plug the dehumidifier into a GFCI (Ground Fault Circuit Interrupter) outlet. If there isn’t an outlet nearby, use a suitable extension cord.
    • Make sure the electrical connection is secure and safe.
  6. Set Dehumidifier Settings:
    • Adjust the dehumidifier settings according to the manufacturer’s recommendations or based on your crawl space’s moisture level. Typically, you can set the desired humidity level and fan speed.
  7. Run a Test Cycle:
    • Allow the dehumidifier to run through a test cycle to ensure it’s functioning correctly and draining moisture properly.
  8. Optional: Encapsulate the Crawl Space:
    • For added moisture control and to improve overall crawl space conditions, you can consider encapsulating the crawl space with a plastic vapor barrier. This involves covering the floor and walls with a thick, durable plastic sheet to create a moisture barrier.
  9. Optional: Install Insulated Ductwork (if needed):
    • If your dehumidifier requires ductwork to distribute dry air, install insulated ducts as per the manufacturer’s instructions. Ensure they are properly sealed and connected to the dehumidifier.
  10. Monitor Regularly:
    • Periodically check the dehumidifier’s operation and empty the water reservoir or ensure proper drainage. Replace or clean filters as needed.
  11. Maintenance:
    • Follow the manufacturer’s recommended maintenance schedule, which may include cleaning the coils, checking for leaks, and replacing filters.
  12. Monitor Crawl Space Conditions:
    • Keep an eye on the crawl space for signs of moisture or mold. Adjust the dehumidifier settings as necessary to maintain the desired humidity level.

Installing a crawl space dehumidifier can significantly improve the moisture levels in your crawl space, promoting a healthier environment and preventing structural damage. If you have concerns about electrical work or are unsure about any aspect of the installation, it’s advisable to consult a professional installer or electrician for assistance.

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