How to Reduce Condensation
from Your Rooftop Air Conditioner in Your Motorhome

Condensation from your motorhome’s rooftop air conditioner can be a nuisance, leading to water damage if not properly managed. Here are some effective ways to reduce condensation and keep your motorhome dry and comfortable:

1. Regular Maintenance

  • Clean Filters: Dirty filters can restrict airflow, causing the air conditioner to work harder and produce more condensation. Clean or replace the filters regularly to ensure efficient operation.
  • PRO TIP: For maximum airflow, clean filters monthly or remove the filter from the Nomadic Interior vent to increase airflow.
  • Inspect Seals and Gaskets: Check the seals and gaskets around the air conditioner unit for any signs of wear or damage. Replacing worn parts can prevent leaks and improve efficiency.
  • Check Drainage System: Ensure the drainage system is clear of debris. Clogged drains can cause water to back up and leak into the motorhome.
  • The X3 ROOFTOP AC is designed to drain directly on the roof of your vehicle. Keep the area around the AC unit clear of obstructions to ensure proper water flow.
  • The X2 ROOFTOP AC is designed to port the condensation off the vehicle using a vehicle-specific drainage design. If a ported drainage system is not used, additional products may be needed to convert the X2 to a rooftop direct drain.

2. Proper Installation

  • Correct Positioning: Ensure the air conditioner is installed flat and horizontal to the vehicle's roof. Improper installation can lead to water pooling and increased condensation.

3. Improve Ventilation

  • Close Vents and Windows: When using the air conditioner, close all vents and windows. The air conditioner will pull moisture from the air, creating condensation as a byproduct. Keeping the vehicle closed will reduce the overall moisture and humidity levels inside the motorhome.

4. Temperature and Humidity Control

  • Maintain Steady Temperature: Try to maintain a consistent temperature inside your motorhome. Frequent temperature fluctuations can increase condensation as warm, moist air meets cooler surfaces.
  • PRO TIP: Set the temperature at a reasonable point compared to outside temperatures. Setting the AC unit at 60°F can increase the chance of freezing the evaporator coils in high humidity environments. Ensure the air conditioner cycles on and off at least twice an hour to reduce the chance of freezing.

5. Power Off Internal Fans

  • Reduce Fan Use in High Humidity: Powering off the internal fans regularly in high humidity environments will increase drainage and decrease the buildup of condensation inside the air conditioner drain pan. The constant force of the internal fan can reduce the flow of condensation out of the drainage ports.


Managing condensation from your rooftop air conditioner is essential for maintaining the comfort and longevity of your motorhome. By implementing these strategies, you can effectively reduce condensation, prevent water damage, and enjoy a dry and comfortable living space on your travels. Regular maintenance, proper installation, improved ventilation, and humidity control are key to keeping condensation at bay.