Installing your Advent RV air conditioner is simpler than ever with clear, step-by-step instructions designed for DIY success. From mounting the unit to sealing ductwork and connecting power, our guide ensures a hassle-free setup that saves time and boosts efficiency—so you can stay cool on the road with confidence.

Key Takeaways

• Read the manual first: Always review Advent RV AC instructions before starting installation.
• Check roof compatibility: Ensure your RV roof supports the unit’s size and weight.
• Use proper sealing: Apply butyl tape and sealant to prevent leaks and drafts.
• Secure mounting bolts: Tighten all hardware evenly to avoid roof damage or misalignment.
• Test before finalizing: Power on the unit to verify operation before completing installation.
• Inspect electrical connections: Confirm wiring matches your RV’s power system and is safely grounded.

Advent RV Air Conditioner Installing Instructions Made Easy

So, you’ve just bought your first RV—or maybe you’re upgrading your old rig—and now you’re staring at a brand-new Advent RV air conditioner, wondering how in the world to get it up and running. Trust me, I’ve been there. The box looks intimidating, the manual is full of technical terms, and you’re half-convinced you’ll accidentally void the warranty just by opening it. But here’s the good news: installing an Advent RV air conditioner doesn’t have to be a nightmare. With the right tools, a little patience, and this step-by-step guide, you’ll have cool, refreshing air flowing through your camper in no time.

Whether you’re a weekend warrior or a full-time RVer, staying cool on the road is essential—especially when you’re parked under the blazing sun in Arizona or hiking through humid Florida summers. Advent air conditioners are known for their reliability, energy efficiency, and quiet operation, making them a popular choice among RV enthusiasts. But even the best product can feel overwhelming if you don’t know where to start. That’s why I’ve put together this comprehensive guide to walk you through every stage of the installation process—from pre-installation prep to final testing. No fluff, no sales pitch—just real, practical advice from someone who’s done it (and made a few mistakes along the way).

Why Choose an Advent RV Air Conditioner?

Before we dive into the installation, let’s talk about why Advent is a solid choice for your RV. Advent, a brand under the Dometic family, has been manufacturing climate control solutions for over 50 years. Their RV air conditioners are designed specifically for the unique demands of mobile living—compact, lightweight, and built to withstand vibrations, temperature swings, and long road trips.

One of the biggest advantages of Advent units is their compatibility with most standard RV roof mounts. Whether you’re replacing an old unit or installing your first AC, Advent models like the Advent 13,500 BTU or Advent 15,000 BTU are designed to fit seamlessly into existing roof cutouts, which saves you time and money on modifications. Plus, many models come with built-in heat pumps, so you can use them for both cooling and heating—perfect for those chilly mountain mornings.

Key Features That Make Installation Easier

• Pre-wired electrical connections: Most Advent units come with color-coded wiring, reducing the chance of mistakes during setup.
• Lightweight construction: Weighing in at around 70–80 pounds, these units are manageable for one or two people to lift and position.
• Universal mounting brackets: Designed to fit standard 14” x 14” roof openings, making retrofits straightforward.
• Quiet operation: Advanced fan designs and insulated compressor housings help keep noise levels down—ideal for peaceful nights under the stars.

Of course, no product is perfect. Some users have reported that the included installation hardware feels a bit flimsy, and the instruction manual could use more visual aids. But overall, Advent delivers solid performance at a competitive price point. And with proper installation, you’ll enjoy years of reliable service.

Tools and Materials You’ll Need Before Starting

Before you even think about lifting that AC unit onto your roof, make sure you have all the right tools and materials on hand. There’s nothing worse than getting halfway through the job only to realize you’re missing a crucial screw or sealant. Here’s a checklist to keep you prepared:

Essential Tools

• Socket wrench set (with extensions)
• Screwdrivers (Phillips and flathead)
• Drill with drill bits (for securing mounting brackets)
• Utility knife or roofing knife
• Caulking gun
• Measuring tape
• Level
• Safety goggles and gloves
• Assistant (highly recommended—roof work is safer with two people)

Materials and Supplies

• Roof sealant (butyl tape or Dicor lap sealant recommended)
• Roof mounting kit (if not included with your Advent unit)
• Electrical wire (12-gauge, 3-conductor, rated for outdoor use—check your unit’s specs)
• Wire nuts or crimp connectors
• Electrical tape
• Roof flashing (if replacing an old unit with a different size)
• Insulation foam (to fill gaps around the unit)

Pro tip: If you’re replacing an old air conditioner, inspect the roof opening before removing it. Look for signs of water damage, rot, or soft spots. If the roof structure is compromised, address those issues first—otherwise, your new AC could be sitting on a weak foundation.

Also, always check your RV’s electrical system. Most Advent units require a 30-amp circuit, so make sure your breaker panel can handle the load. If you’re unsure, consult an electrician or your RV dealer before proceeding.

Step-by-Step Installation Process

Now for the main event: actually installing your Advent RV air conditioner. This process typically takes 2–4 hours, depending on your experience level and whether you’re replacing an old unit or doing a fresh install. Let’s break it down into manageable steps.

Step 1: Prepare the Roof Opening

If you’re replacing an old AC, start by carefully removing it. Turn off power to the unit at the breaker panel, then disconnect the wiring. Use a socket wrench to remove the mounting bolts, and gently lift the old unit off the roof. Be careful not to damage the surrounding roof material.

Once the old unit is out, clean the opening thoroughly. Remove any old sealant, debris, or insulation. Use a utility knife to trim away loose roofing material. The opening should be clean, dry, and free of obstructions.

If you’re installing a new unit in a fresh location, measure and mark a 14” x 14” square on the roof. Use a level to ensure your lines are straight. Then, carefully cut through the roof using a reciprocating saw or jigsaw. Be cautious not to cut into roof supports or wiring beneath the surface.

Step 2: Install the Mounting Bracket

Most Advent units come with a universal mounting bracket that fits standard roof openings. Position the bracket over the opening and align it so it’s centered and level. Use a drill to secure it with the provided screws. Make sure the bracket is flush with the roof surface—any gaps can lead to leaks later.

Apply a generous bead of roof sealant (like Dicor) around the edges of the bracket before securing it. This creates a waterproof barrier and helps prevent moisture from seeping into your RV.

Step 3: Position the Air Conditioner

This is where having a helper really pays off. Advent units are heavy, and trying to lift one onto the roof alone is risky. With your assistant, carefully lift the AC unit and position it onto the mounting bracket. Make sure the unit is centered and aligned with the bracket.

Once it’s in place, secure it using the mounting bolts provided. Tighten them evenly to avoid warping the unit or damaging the roof. Don’t overtighten—this can crack the plastic housing or strip the threads.

Step 4: Seal the Roof

Now it’s time to waterproof the installation. Apply a thick layer of butyl tape or liquid sealant around the entire perimeter of the unit where it meets the roof. Pay special attention to the corners and seams. Then, install the roof flashing (if required) over the top of the unit and secure it with screws. Seal all screw heads with additional sealant.

For extra protection, consider adding a second layer of sealant over the flashing. This creates a redundant barrier against leaks—something I learned the hard way after a rainy camping trip in Oregon.

Step 5: Connect the Electrical Wiring

Turn off the power at the breaker panel before working on any electrical connections. Locate the wiring compartment on the underside of the AC unit. You’ll typically find three wires: black (hot), white (neutral), and green (ground).

Run 12-gauge, 3-conductor wire from your RV’s breaker panel to the AC unit. Strip the ends of the wires and connect them to the corresponding terminals on the unit. Use wire nuts or crimp connectors to secure the connections, and wrap them with electrical tape for added safety.

Double-check your connections against the wiring diagram in the Advent manual. Reversing the hot and neutral wires can damage the unit or create a fire hazard.

Step 6: Test the System

Once everything is connected, turn the power back on and test the unit. Set the thermostat to a low temperature and listen for the compressor to kick on. Check for cool air coming from the vents and ensure the fan is running smoothly.

If the unit doesn’t turn on, double-check your wiring and breaker. If it runs but doesn’t cool properly, inspect the air filter and ensure there are no obstructions in the airflow.

Common Installation Mistakes to Avoid

Even with the best intentions, things can go wrong during installation. Here are some common pitfalls I’ve seen (and made myself) and how to avoid them:

Skipping the Roof Inspection

Installing a new AC on a damaged roof is like building a house on sand. Always inspect the roof structure before mounting the unit. Look for soft spots, water stains, or signs of rot. If you find damage, repair it first—otherwise, you’re just setting yourself up for future leaks and costly repairs.

Improper Sealing

One of the biggest causes of RV roof leaks is poor sealing around the AC unit. Don’t skimp on the sealant. Use high-quality products like Dicor or butyl tape, and apply them generously. Remember: it’s better to over-seal than under-seal.

Incorrect Wiring

Electrical mistakes can be dangerous. Always turn off the power before working on wiring, and double-check your connections. If you’re not confident working with electricity, hire a licensed electrician. It’s not worth the risk.

Over-tightening Mounting Bolts

While it’s important to secure the unit firmly, over-tightening the bolts can crack the plastic housing or warp the base. Tighten them just enough to hold the unit in place—snug, but not excessive.

Ignoring the Manual

Yes, the Advent manual isn’t the most exciting read, but it contains crucial information specific to your model. Skipping it can lead to installation errors or void your warranty. Take the time to review it before you start.

Maintenance Tips to Keep Your Advent AC Running Smoothly

Installing your Advent RV air conditioner is just the beginning. To keep it running efficiently for years, regular maintenance is key. Here are some simple tips to extend the life of your unit:

Clean the Air Filter Monthly

The air filter traps dust, pollen, and debris, preventing them from entering the unit. A clogged filter reduces airflow and forces the compressor to work harder, increasing energy use and wear. Remove the filter (usually located behind a vent cover inside the RV), rinse it with water, and let it dry before reinstalling.

Inspect the Coils Annually

The evaporator and condenser coils can collect dirt over time, reducing efficiency. Use a soft brush or coil cleaner to gently remove buildup. Be careful not to bend the delicate fins.

Check the Sealant Every Season

Roof sealant can crack or shrink over time, especially in extreme temperatures. Inspect the seal around your AC unit at least once a year and reapply sealant as needed.

Cover the Unit When Not in Use

If you store your RV during the off-season, consider using an AC cover to protect the unit from UV rays, rain, and debris. This simple step can prevent premature aging and keep the exterior looking new.

Listen for Unusual Noises

If your AC starts making grinding, squealing, or rattling sounds, it could indicate a loose component or failing motor. Address issues early to avoid costly repairs down the road.

Performance Comparison: Advent vs. Other RV AC Brands

When choosing an RV air conditioner, it’s natural to compare brands. Here’s how Advent stacks up against some popular competitors:

Feature	Advent 13,500 BTU	Dometic Brisk II 13,500 BTU	Coleman Mach 8 15,000 BTU
BTU Output	13,500	13,500	15,000
Weight	78 lbs	85 lbs	92 lbs
Noise Level (dB)	62	65	68
Energy Efficiency (EER)	11.5	11.0	10.8
Heat Pump Option	Yes	Yes	No
Warranty	2 years	2 years	1 year

As you can see, Advent offers a strong balance of performance, efficiency, and value. While it may not have the highest BTU output, its quiet operation and heat pump capability make it a versatile choice for most RVers.

Final Thoughts: You’ve Got This!

Installing an Advent RV air conditioner might seem daunting at first, but with the right preparation and a steady hand, it’s a totally doable DIY project. From checking your roof to sealing the unit and wiring it up, each step brings you closer to enjoying cool, comfortable air on your next adventure.

Remember, the key to a successful installation is patience and attention to detail. Don’t rush the process, and don’t hesitate to ask for help when you need it. And once your AC is up and running, take a moment to appreciate your handiwork—you’ve just added a major upgrade to your home on wheels.

Whether you’re heading to the desert, the mountains, or the coast, a properly installed Advent air conditioner will keep you cool and comfortable no matter where the road takes you. So grab your tools, follow this guide, and get ready to beat the heat in style.

Frequently Asked Questions

What tools do I need to install an Advent RV air conditioner?

You’ll need basic tools like a drill, screwdriver, socket wrench, tape measure, and a level. Having a helper is also recommended to safely lift and position the unit during installation.

Can I install an Advent RV air conditioner myself, or do I need a professional?

Many RV owners successfully install Advent air conditioners themselves by following the included instructions carefully. However, if you’re unsure about electrical or roof structural work, hiring a professional is safer.

Where should I place the Advent RV air conditioner on my roof?

The unit should be installed near the front third of the RV roof for optimal weight distribution and airflow. Make sure the location avoids roof vents, seams, or weak spots.

How do I ensure a proper seal when installing the Advent RV air conditioner?

Use high-quality butyl tape or roofing sealant around the base flange to prevent leaks. Tighten mounting bolts evenly and recheck the seal after installation and during routine maintenance.

What electrical requirements are needed for Advent RV air conditioner installation?

Most Advent models require a dedicated 120V AC circuit with proper amperage (usually 15-20 amps). Always consult your model’s specs and consider a professional electrician if upgrading your RV’s electrical system.

Do I need to modify my RV roof before installing the Advent air conditioner?

Minor modifications like cutting an appropriately sized hole and reinforcing the roof may be necessary. Follow the Advent RV air conditioner installing instructions precisely to avoid structural damage or leaks.