
Front view of the Rosewill RHPA-18003 Portable Air Conditioner, showcasing its sleek white design and digital display.
Thank you for choosing the Rosewill RHPA-18003 Portable Air Conditioner. This versatile 4-in-1 unit provides cooling, heating, dehumidifying, and fan functions, designed to offer comfort in spaces up to 300 square feet. Its compact design, remote control, and intelligent features like Sleep Mode and a 24-hour timer make it an efficient and convenient solution for your home or office.
Please read this manual thoroughly before operating the appliance to ensure proper use, maintenance, and safety.
The Rosewill RHPA-18003 comes with the following components:

Illustration of the main components included with the portable air conditioner: Exhaust Heat Pipe Assembly, Remote Control, Washer/Screw/Nut, and Window Sealing Plate Assembly.
Follow these steps for initial setup:

The portable air conditioner with its exhaust hose connected to a window kit, demonstrating proper setup for air ventilation.
The unit can be operated using either the control panel on top of the unit or the included remote control.

Detailed view of the control panel with buttons for Timer, Fan, Up, Display Window, Down, Mode, and Power, each numbered for easy identification.

The remote control for the portable air conditioner, showing buttons for Power, Temperature Increase/Decrease, Timer, Mode, Swing, Fan Speed, Sleep Mode, and Temperature unit conversion (°C/°F).
The remote control duplicates most functions of the control panel and adds a Swing button for automatic louver movement and a °C/°F button to switch temperature units.
Regular maintenance ensures optimal performance and extends the life of your unit.
The unit features washable dust filters (Coated Net Filter, Activated Carbon, Pre-Filter) that trap dirt and debris. Clean the filters every two weeks or more frequently depending on usage and air quality.

Side view of the Rosewill portable air conditioner showing the removable air filter for cleaning.
In Dehumidifier mode or high humidity conditions, water will accumulate in the internal reservoir. The unit has a self-evaporating system, but manual drainage may be required if the 'Full' indicator lights up.
If storing the unit for an extended period:
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not turn on. | No power; LCDI plug tripped; Timer is set. | Check power outlet; Reset LCDI plug; Cancel timer setting. |
| Unit does not cool/heat effectively. | Air filter dirty; Room too large; Exhaust hose not properly installed; Doors/windows open. | Clean air filter; Ensure room size is within specifications; Check exhaust hose connection; Close all doors and windows. |
| Water leakage. | Drain plug loose; Unit not level; Internal reservoir full. | Secure drain plug; Place unit on a level surface; Drain water from the unit. |
| Noisy operation. | Unit not on a level surface; Obstruction in fan. | Ensure unit is level; Check for and remove any obstructions. |
If the problem persists after attempting these solutions, please contact customer support.
| Feature | Specification |
|---|---|
| Model | RHPA-18003 |
| Functions | Cooling, Heating, Fan, Dehumidifying |
| Cooling Power | 12,000 BTU |
| Coverage Area | Up to 300 Sq.Ft. |
| Noise Level | 56 dB |
| Voltage | 115 Volts |
| Dimensions (H x W x D) | 34.70" x 18.90" x 15.80" |
| Unit Weight | 73.00 lbs (71.4 pounds listed in specifications) |
| Timer | 24 Hours |
| Fan Speeds | 3 |
| Energy Efficiency | Energy Star Certified, SEER 7.00 |
This Rosewill RHPA-18003 Portable Air Conditioner comes with a 1-year limited warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. For specific terms and conditions, please refer to the warranty card included with your product or contact Rosewill customer support.
For technical assistance, troubleshooting, or warranty claims, please contact Rosewill customer support. You may also find additional resources and FAQs on the official Rosewill website.
For a digital copy of the user manual, you can refer to the PDF document available at: Rosewill RHPA-18003 User Manual PDF
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Rosewill RHPA-18003 Portable Air Conditioner User Manual User manual for the Rosewill RHPA-18003 4-in-1 12000 BTU Portable Air Conditioner, covering specifications, features, installation, operation, maintenance, safety, and troubleshooting. |
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