Thinking about upgrading your RV with a new air conditioner but not sure where to begin? You’re not alone. Whether you’re replacing an old unit or installing one for the first time, this guide will walk you through everything you need to know to install a TOSOT ductless rooftop AC system—all by yourself. It's easier than you think, and you don't need to be a pro to get it done.

Table of Contents

1. Before You Read
2. Step 1: Sealing
3. Step 2: Outdoor Unit Mounting
4. Step 3: Upper Duct Plate Installation
5. Step 4: Ceiling Frame Installation
6. Step 5: Bottom Duct Plate Installation
7. Step 6: Electrical Wiring
8. Step 7: Install the Ceiling Grille
9. Watch Real Installation Videos
10. FAQs

Before You Read

Before starting your RV AC installation, please double-check the following:

• Power Supply Compatibility: TOSOT RV AC requires a 115V power supply with either a 15-amp or 20-amp time delay fuse or circuit breaker.
• System Type: This guide is for ductless units only.
• Opening Dimensions: Standard 14.25” x 14.25”.
• Roof Thickness:
  • 1.2–3.15 inches: use 5.3” bolts
  • 3.15–5.32 inches: use 7.5” bolts
    

Step 1: Sealing

Attach the gasket and sponge with sealing strip to the designated locations on the outdoor unit chassis.

Step 2: Outdoor Unit Mounting

Lift the unit to the rooftop and align it horizontally with the opening.

Step 3: Upper Duct Plate Installation

• Stick the fabric duct to the flat side of the upper duct plate. Black side out.

• Secure it using 4 self-tapping screws.

Step 4: Ceiling Frame Installation

• Remove and save the 4 screws.

• Pull out wire bundles and align the junction box.

• Secure using:
  • 5.3” bolts for 1.2–3.15 inch roofs
  • 7.5” bolts for 3.15–5.32 inch roofs

⚠️ Confirm roof thickness before proceeding.

Step 5: Bottom Duct Plate Installation

Secure the bottom duct plate using 4 screws and trim excess fabric.

Step 6: Electrical Wiring

• Route the power cord into the junction box.

• Connect wires:
  • Black → L (Live)
  • White → N (Neutral)
  • Yellow-Green → Ground

• Reconnect control signal wires to display box.

Step 7: Install the Ceiling Grille

Secure the grille with 4 screws. Control panel should face the front of the RV.

Watch Real Installation Videos

Installing your RV AC can vary depending on your vehicle type, and it always helps to see how others tackled the job. Below are real-world installations from YouTubers who’ve upgraded everything from truck campers to Class B vans. You’ll also hear their honest reviews of the TOSOT unit.

• Honey I Roam：Upgrade for truck camper and review
• Leave Her Wild：Class B Motorhomes Upgrades
• Big Truck Big RV：RV AC overviews and soft start installation
  
• Living for a Living: Trailor Upgrade and RV AC review
• FnA Van Life: Toy haulers upgrade

Frequently Asked Questions 

Q: Can I install a TOSOT RV AC by myself?
A: Yes, this guide is designed for DIY users.

Q: Is the TOSOT rooftop AC compatible with ducted systems?
A: No, it is for ductless systems only. 

Q: What tools do I need?
A: Screwdriver, drill (if needed), and sealant. All other parts are included.

Q: Why does my RV AC keep tripping the breaker?
A: Likely caused by high inrush current. A Soft Start device helps reduce this and prevents tripping.

Conclusion & Final Checks

For any questions or inquires, you can reach out to support@tosotdirect.com for assistance. We are always happy to help. 

• Recheck power wiring and connections
• Ensure unit is level and sealed
• Test the unit via control panel

Enjoy a cooler, quieter RV journey!