Purchasing a used roof air conditioner for an RV can save money while keeping travel comfortable. This guide covers what to look for, how to install, and how to maintain a pre-owned unit. It emphasizes practical checks, compatibility, and best practices to maximize performance and safety.
Why Choose A Used Roof Air Conditioner For An RV
Cost efficiency is the primary driver for many buyers. Used units typically cost significantly less than new models, allowing travelers to upgrade without a large upfront investment. Space and weight considerations also matter, as a compact, properly sized unit can fit existing openings with minimal modification. Availability of discontinued or older models can be a benefit for restorations or projects with specific roof profiles. However, buyers should balance savings with potential repair costs and limited warranties.
Key RV Roof AC Types And Compatibility
Choosing the right type ensures reliable cooling and compatibility with the RV’s electrical and roof structure. The most common models are:
- R-410A roof top units favored for efficiency and availability of refrigerant.
- R-134a or older refrigerants may require retrofits or may be harder to service.
- Single-hose vs. dual-hose units impacting cooling efficiency and power draw.
- Rear-share and ducted configurations affecting airflow distribution inside the RV.
Before purchasing, verify the BTU rating matches the RV size, and confirm the roof cutout dimensions align with the unit. A mismatch can require costly fiberglass work or mounting brackets. Check the power requirements against the RV’s electrical system, especially if generators or shore power will be used interchangeably.
What To Inspect In A Used Roof AC
A thorough inspection helps prevent outages on the road. Focus on these areas:
- Exterior shell for cracks, rust, or damaged seals around the housing.
- Fan motors and blades for wear, noise, or imbalance.
- Electrical harness and wiring for melted insulation or loose connectors.
- Condensing coil and airflow path for obstructions or dirt buildup.
- Thermostat and control board responsiveness and accuracy.
- Drainage plenum to ensure condensation drains correctly without leaks inside the RV.
- Roof integrity around the mounting hole, looking for signs of leaks or compromised sealtape.
Ask for the unit’s service history, including refrigerant recharge, capacitor replacements, and any past refrigerant leaks. If possible, request a live test to confirm cooling performance and noise levels. A reputable seller should provide documentation or a verifiable history.
Installation: What To Expect And How To Prepare
Installing a used unit requires careful planning to ensure a safe, durable fit. Here are essential steps and considerations:
- Roof and cutout measurements must match the unit’s specifications. Inconsistent dimensions can cause leaks or improper mounting.
- Mounting hardware should be appropriate for the roof type (fiberglass, rubber, or metal) and the unit’s weight.
- Sealing with high-quality butyl tape or non-setting sealant preserves roof integrity and prevents leaks.
- Electrical wiring must comply with RV electrical standards. Ensure proper gauge wiring, proper fusing, and a reliable power source for starting and running the compressor.
- Ventilation and clearance around the condenser are critical for cooling efficiency. Ensure there is adequate airflow and unobstructed intake and exhaust paths.
- Roof reinforcement may be necessary if the unit is heavy. Some installations require supporting brackets or an upgraded roof patch kit.
- Professional inspection after installation helps verify seals, electrical connections, and cooling performance.
Maintenance: Keeping A Used RV Roof AC Performing Well
Regular care extends the life of a used unit and minimizes breakdown risk. Key maintenance tasks include:
- Annual cleaning of evaporator and condenser coils to maintain airflow and efficiency.
- Filter inspection and replacement as needed to prevent restricted airflow.
- Refrigerant checks if a leak is suspected; only a licensed tech should handle refrigerant work.
- Electrical checks for loose connections, cracked insulation, and overheating components.
- Seal inspections around the roof cutout to prevent water intrusion during rain or car washes.
- Sound and vibration monitoring to catch worn bearings or misaligned fans early.
Cost Considerations: Used vs. New
Understanding hidden costs helps determine true ROI. Consider:
- Purchase price of a used unit versus a new one with a similar BTU rating.
- Installation costs including mounting hardware and potential roof repairs.
- Potential repairs such as refrigerant recharge, capacitor replacement, or fan motor fixes.
- Operating efficiency of older refrigerants or lower SEER ratings, affecting electricity usage on long trips.
- Warranty limitations or absence, which shifts risk to the buyer for future failures.
Where To Source A Used RV Roof AC
Reliable options include:
- RV parts dealers that specialize in salvaged or refurbished units with some warranty.
- Online marketplaces offering seller ratings and return policies, with careful vetting of unit history.
- RV service centers that occasionally stock used units and provide installation services.
- Local classifieds where inspection is possible before purchase, ideally with a test run.
When buying, request photos of the unit in operation, proof of testing, and any available documentation. If possible, obtain a short-term warranty or return policy to mitigate risk.
Compatibility Checklist
| Item | Considerations |
|---|---|
| BTU rating | Match RV size for effective cooling without excessive run time. |
| Roof cutout size | Ensure mounting aligns with existing opening or plan for modification. |
| Electrical requirements | Verify voltage, amperage, and fusing align with shore power or generator capabilities. |
| refrigerant type | R-410A is common; older units may use R-22 or R-134a—consider retrofit implications. |
| Weight/load | Confirm roof capacity and mounting hardware can support the unit safely. |
| Warranty status | Used units may have limited or no warranty; assess risk and coverage for repairs. |
Conclusion: Making An Informed Decision
Choosing a used roof air conditioner for an RV can be a smart move when approached with due diligence. Prioritize accurate BTU sizing, roof compatibility, and a solid inspection of mechanical and electrical components. A careful installation plan and ongoing maintenance will help ensure comfortable summers on the road while protecting the RV’s structure and electrical system. With the right unit and proper care, a used roof AC can deliver dependable cooling for many adventures.