Travel trailer roof air conditioners keep mobile homes cool on hot days, ensuring comfortable nights in any climate. This guide covers types, sizing, installation, maintenance, troubleshooting, and energy considerations to help owners choose and manage the right unit for their RV.
Understanding Travel Trailer Roof Air Conditioners
RV roof air conditioners sit on the trailer’s roof and push cooled air through ductwork or through vents in single-room setups. The two main types are roof-mounted units with a single evaporator and external components housed in a compact condenser box. Common capacities include 13.5k and 15k BTU, with 15k often favored for larger floor plans. Efficiency and noise levels vary by model and brand, impacting comfort and fuel or electrical usage.
Choosing the Right Size
Sizing an RV air conditioner involves calculating heat load and considering insulation, climate, and occupancy. A typical rule of thumb is 20,000 BTU per 1,000 square feet for a home, but RVs rely on smaller, portable calculations. For most travel trailers, a 13.5k BTU unit excels in mild conditions, while a 15k BTU unit handles hotter environments or larger floor plans. When in doubt, consult the manufacturer’s guidelines for your specific trailer model and climate zone.
Key Brands And Models
- Dometic provides popular roof-top units with integrated thermostats and low-profile designs.
- Coleman-Mach offers rugged, workhorse models with efficient compressors and quiet operation.
- Norcold delivers compact options aimed at light-to-midweight trailers.
When evaluating models, compare BTU rating, Energy Efficiency Ratio (EER), noise level in decibels, weight, and warranty. Check compatibility with existing ductwork or consider a retrofit plan if upgrading from a window or portable unit.
Installation Considerations
Proper installation ensures performance and safety. Key steps include verifying roof structure strength, sealing around the unit to prevent leaks, and routing electrical connections correctly. Most units require a dedicated 115V circuit and may need a power converter if the trailer uses 30-amp service. Consider professional installation if unsure about frame reinforcement, wiring, or vent alignment.
- Inspect the roof surface for leaks and repair prior to mounting.
- Use OEM mounting brackets and gaskets to prevent water intrusion.
- Verify the location aligns with interior ducting and headroom inside the trailer.
Electrical And Power Considerations
Roof air conditioners demand significant electrical supply. A 13.5k BTU unit typically draws around 12–14 amps on high, while a 15k BTU model may use 15–20 amps. In a 30-amp rig, a single air conditioner is feasible, but power management becomes critical when running other appliances. Running on generator power is common in remote locations, and some RVs use inverter setups for quieter operation.
Energy efficiency tips include using the thermostat to moderate cooling, keeping outdoor vents clear, and minimizing heat gain by shading the unit and sealing windows with reflective coverings.
Maintenance And Troubleshooting
Regular maintenance prolongs life and ensures optimal airflow. Key tasks include cleaning or replacing air filters monthly, inspecting the condenser coils for debris, and checking seals for leaks. Audible changes in noise or a drop in cooling performance can signal low refrigerant, duct blockages, or a failing compressor.
- Clean dust from the exterior housing and fan blades gently with a soft brush.
- Inspect the rooftop sealant and gaskets for cracks or gaps.
- Test the thermostat and control wiring for proper operation.
Common troubleshooting steps:
- If the unit won’t start, check the circuit breaker and fuses on the RV’s power panel.
- If cooling is weak, clean filters and coils, then verify airflow through ducts.
- If the unit cycles on and off rapidly, check for proper thermostat calibration and system pressure (professional service may be required).
Air Quality, Comfort, And Noise Considerations
RV air conditioners should provide even cooling with minimal vibration. Noise levels vary by model; many units operate around 50–60 decibels at moderate speeds. For sensitive sleepers, look for models marketed as quiet or low-noise. Air distribution can be improved with strategically placed vents and, if needed, a booster fan near intake or supply ducts.
Maintenance Schedule At A Glance
| Task | Frequency | Notes |
|---|---|---|
| Filter Cleaning | Monthly | Replace if deteriorated |
| Condenser Coils Cleaning | Every 3–6 months | Remove debris and rinse gently |
| Sealant/Leak Check | Seasonally | Inspect roof penetrations and gasket integrity |
| Electrical Inspection | Annually | Verify wiring, breakers, and ground fault protection |
Common Myths And Misconceptions
- Myth: Bigger BTU always means cooler. Truth: Oversized units cycle too quickly, reducing dehumidification and comfort.
- Myth: Roof air conditioners don’t need maintenance. Truth: Regular cleaning and seal checks prevent leaks and inefficiency.
- Myth: All RV A/C units can be run on any generator. Truth: Power requirements vary; ensure the generator matches the unit’s electrical draw.
Best Practices For Prolonged RV A/C Lifespan
- Protect the outdoor unit from severe weather using a cover when not in use.
- Avoid closing doors and vents abruptly to prevent pressure build-ups inside the unit.
- Schedule professional refrigerant checks to avoid voiding warranties and ensure efficiency.
Frequently Asked Questions
- Can I install a new roof air conditioner myself? Some units are DIY friendly, but installation often requires roof reinforcement, electrical modifications, and leak testing, so professional installation is recommended for most trailers.
- How often should I replace an RV roof gasket? Inspect annually and replace when signs of cracking or leakage appear.
- What is the typical lifespan of a roof air conditioner? With proper maintenance, many units last 10–15 years, depending on usage and climate.