RV owners who consistently camp in hot climates may want to prioritize: 

• Higher cooling capacity
• Variable-speed compressor systems 
• Improved airflow distribution
• Better humidity control 

Heat load from direct sun exposure, large windows, and poor insulation can significantly affect cooling performance. 

For full-time RV living or extended trips, comfort related features may become more important. 

Some examples include: 

• Quieter operation
• Reduced cycling noise
• Multi-zone controls (for ducted systems)
• More stable temperature 
• Improved humidity control 

Some modern variable-speed systems, such as the Furrion Chill Cube, are designed with quieter operation, generator compatibility, consistent temperatures, and humidity control in mind. 

Replacing or upgrading an RV HVAC system can feel overwhelming, especially with changing refrigerants, compatibility requirements, and varying power demands. Many common issues happen not because the equipment is defective, but because important system details were forgotten or overlooked during the buying process. 

Being aware of common mistakes ahead of time can help prevent compatibility issues, unnecessary expenses, and frustrating installation surprises. 

1. Assuming Components Are Universal

Many RV HVAC components are designed to work only with certain systems, design series, or system generations. It is always best to confirm compatibility when replacing any component. 

2. Buying Based on BTU Rating

Higher BTU ratings do not automatically mean better performance or comfort. Oversized systems may short cycle, while undersized units may struggle in peak heat. 

3. Overlooking Ducted vs Non-Ducted Compatibility

Some rooftop units, ceiling assemblies, and other components are designed specifically for ducted or non-ducted systems. Ordering the wrong configuration can create installation and airflow problems. 

4. Ignoring Single Zone vs Multi-Zone Requirements

Thermostats and controllers may only support certain zone configurations.

5. Forgetting About Startup Requirements

A generator that can handle AC running wattage may still struggle with compressor startup surge. Startup draw is one of the most commonly overlooked electrical considerations. 

6. Assuming Existing Thermostats Will Still Work

Replacing a rooftop unit or control box may also require replacing the thermostat, depending on system compatibility and refrigerant type. 

7. Underestimating Climate and RV Heat Load

Outdoor temperature, insulation quality, sun exposure, and RV layout can all significantly affect cooling performance. Two RVs of similar size can have very different cooling needs. 

8. Choosing Based Only On Price

Lower-cost systems are not always the best long-term fit. Noise levels, compressor design, efficiency, compatibility, and comfort features can make a major difference during daily use. Sometimes a higher initial investment can end up saving you a lot of money down the line. 

• Confirm whether your current system is ducted or non-ducted
• Verify single zone or multi-zone compatibility
• Determine the correct BTU size 
• Check thermostat and control box compatibility 
• Consider power requirements and / or generator size 
• Review compatibility information before ordering

Running an RV HVAC system on a generator involves more than simply matching BTU ratings. Factors such as startup surge, electrical service, compressor design, and total appliance load can all affect whether a system performs reliably. 

Understanding a few basic electrical concepts can make it easier to choose a compatible generator and avoid common frustrations. 

One of the first things to understand is whether your RV uses 30 amp or 50 amp service. This can often be found near the RV power inlet, on electrical labels near the hookup connection, or in the owner's manual. 

Quick Comparison

Running wattage does not tell the full story. RV HVAC systems often require significantly more power during startup than during normal operation. 

Running watts: The power required during steady operation after the system is already running

Starting watts / surge watts: The brief but much higher power draw required to start the compressor. This startup surge is often what causes tripped breakers or struggling generators. 

Fixed Speed Compressors

Traditional fixed speed systems typically start up at full power every time cooling is needed. This repeated on/off cycling can create larger startup surges that may overwhelm generators. 

Some fixed speed systems can briefly draw 2-3 times their running wattage during startup. 

Variable-Speed / Inverter Style Systems

Variable-speed systems gradually ramp output up or down based on cooling demand rather than repeatedly starting at full power. 

Benefits

• Reduced startup intensity
• Improved generator compatibility
• Smoother operation
• Easier on smaller inverter generators

Because startup demand is often lower, generator-powered operation may feel more manageable compared to fixed speed systems. 

Power requirements vary by system and operating conditions, but the following is a general example: 

Many 13.5K BTU - 15K BTU systems require approximately: 

• 1,200 - 1,800 running watts
• 1,500 - 3,000+ startup watts

Actual requirements are affected by compressor design, outdoor temperature, efficiency, and additional connected loads. 

In some situations, reducing other electrical loads may help. 

Examples include: 

• Turning off microwaves
• Turning off electric water heaters
• Avoiding running other high-draw appliances simultaneously
• Allowing the fan to start before heavy cooling demand increases
  • Important Note: Installing non-approved electrical devices or operating HVAC systems outside of manufacturer guidelines or power requirements may void warranties, damage components, or create fire risks. Although alternative methods may be widely used or suggested, it is always best to follow manufacturer recommendations.

Choosing the right generator requires considering the total electrical load inside the RV, not just the air conditioner alone. 

Other appliances to keep in mind are: 

• Refrigerators
• Battery chargers/converters
• Microwaves
• Electric water heaters
• TVs and other electronics
• Small appliances and outlets

1. Identify AC Running and Startup Wattage

Check product documentation whenever possible. 

2. Add Other Essential Loads

Consider which appliances may run at the same time as the AC. 

3. Account for Peak Demand

Startup surge and simultaneous appliance usage need to be accounted for.

4. Add a Safety Buffer

Leaving additional capacity can improve reliability and reduce strain. A general recommendation is to maintain approximately 20% extra capacity beyond estimated demand when possible. 

Altitude

• Higher elevations reduce engine output due to thinner air

Extreme Heat

• Hot weather increases cooling demand and may reduce generator efficiency

Generator Maintenance

• Dirty filters, old oil, poor fuel quality, or clogged fuel systems can reduce performance and create unstable voltage conditions

RV Insulation & Heat Load

• Poor insulation, large windows, direct sunlight, and frequently opening doors can increase cooling demand significantly

A few simple habits may improve cooling performance while reducing generator strain: 

• Pre-cool the RV before peak outdoor temperatures
• Keep doors and windows closed as much as possible
• Use shade, awnings, or reflective window coverings 
• Avoid setting the thermostat temperature extremely low
• When possible, reduce simultaneous appliance usage during peak cooling demand 

Systems with variable-speed compressors or energy saving (eco) modes may also help maintain comfort with lower generator load and reduced noise. 

Can a 2,000W generator run an RV AC?

Sometimes. It depends on startup surge, compressor design, outdoor temperatures, and other appliances that operate simultaneously. 

What is the difference between running watts and starting watts?

Running watts describe the amount of power required by the AC when operating steadily after starting up. Starting watts describe the brief surge of power drawn when the rooftop units initially kicks on. This is more applicable to traditional fixed speed systems, as the startup surge occurs every time the AC cycles on. 

Do variable speed air conditioners require less power?

Variable speed units have a significantly reduced startup surge by gradually ramping up speeds rather than starting up suddenly at full power. This is much easier for a generator to handle compared to traditional fixed speed systems. 

Although startup surge is vastly reduced, the running watts are not always dramatically lower than traditional units. However, when assessing generator sizing, startup surge has a much greater effect than the running watts. 

Does higher elevation affect my generator?

Yes. Generator output decreases at higher elevations due to thinner air, which can reduce available power. 

Why does my generator trip when my AC starts?

Potential causes: 

• Startup surge
• Other appliances running at the same time 
• An undersized generator 
• A dirty air filter causing higher compressor load 
• High outdoor temperatures 

Do I need a soft start to run my RV AC on a generator?

A soft start device can make it easier for a generator to handle a fixed speed RV AC. However, it is not required if the generator is of an adequate size to handle the startup surge. Some rooftop units are already designed with soft start operation, while others may be compatible with add-on devices that enable soft start functionality. 

Variable speed units do not require soft starts. They are designed to gradually ramp compressor speeds up and back down, which means there is no large startup surge. 

Does hot weather affect generator performance?

Hotter outdoor temperatures mean increased cooling demand. This means that your system is going to work harder to maintain the set temperature inside your RV. The result is longer compressor run times and more power draw. High heat can also reduce the efficiency of generators. 

Can I run two RV air conditioners on 30A service?

The short answer: usually not. It may be possible with load management (soft start, variable speed units, reducing the amount of appliances that run simultaneously, etc), but isn't advisable. If 30A service is all that is available, you may only be able to run one unit at a time. 

Should I buy a bigger generator than I think I need? 

This is definitely the safest option. A generator with a substantial power buffer leaves room for future upgrades, adding additional appliances, and reduces the strain placed on the generator. You are much more likely to regret buying an undersized generator as opposed to one that is oversized. 

RV HVAC power requirements can vary significantly depending on compressor design, climate conditions, and overall electrical demand throughout the RV. Understanding concepts such as startup surge, electrical service, and total appliance load can help make generator selection much easier and reduce frustration when operating your RV HVAC system off grid or on limited power sources. 

Cooling capacity is important, but comfort goes beyond the temperature in your RV. Factors such as compressor design, airflow, cycling behavior, and system configuration can all influence noise levels, temperature consistency, and overall comfort. These factors can make a significant difference in comfort, yet they can often be overlooked.

Understanding what affects comfort can help you decide how to prioritize features when comparing systems. 

The noise level of your system is not just about the decibel rating. The following factors can all affect perceived noise levels: 

• Compressor cycling
• Fan speed changes
• Vibration 
• Air distribution

For example, two systems with similar decibel ratings may sound totally different if one starts and stops abruptly while the other gradually adjusts output. 

Rooftop units generally require additional power during startup compared to normal operation. Some systems offer soft start technology (either integrated or as an optional add-on device) or other similar features designed to reduce sudden startup demands. 

Soft Start Benefits

• Smoother startup 
• Reduced electrical strain
• Potential improved generator compatibility
• Less abrupt startup noise

While startup behavior varies by system, reducing sudden power spikes may contribute to a quieter and more comfortable experience. 

Comfort is not only determined by temperature. How often a system cycles on and off can also affect humidity, noise, and efficiency. 

Short Cycling

Short cycling occurs when an air conditioner repeatedly turns on and off in short intervals. (Important note: this issue is most relevant when discussing fixed speed systems. Variable speed systems are designed to function properly even at lower operating speeds)

Potential causes may include oversized cooling capacity (too many BTUs) or system inefficiencies. 

Potential effects: 

• Uneven temperatures
• Increased humidity
• More noticeable cycling noise
• Additional wear on components

Continuous Operation

In other situations, an air conditioner may run nearly nonstop while struggling to maintain the set temperature. (Important note: This is most relevant to fixed speed systems as well. Variable speed units are designed to operate continuously by adjusting the ouput to match cooling demands)

Possible causes may include: 

• Undersized cooling capacity
• Extreme outdoor temperatures
• Poor insulation
• High heat load inside the RV

Continuous operation may indicate that the system is working harder than intended. 

A comfortable RV interior often depends on multiple factors, including: 

• Stable temperatures
• Consistent airflow
• Lower humidity
• Reduced cycling noise
• Proper cooling capacity for the space

The coldest system is not always the most comfortable one. 

The best RV air conditioner for your RV depends on how and when you camp and the features that are most important to you. If you're ready to start comparing options, you can view our collection of Furrion rooftop units. 

Continue to our next post, "Generator & Power Requirements," to learn how electrical requirements may affect which system you choose. 

One of the most common misconceptions about RV HVAC systems is that certain (or all) components are universally interchangeable. In reality, many components need to work within specific system requirements. 

Replacing one part does not always mean replacing others, but compatibility should be verified before purchasing new components. 

Before ordering a replacement part or putting together a whole new system, consider the following: 

1. Is my system ducted or non-ducted?

This can affect compatiblity with rooftop units, ceiling assemblies, control boxes, and thermostats. 

2. Is my system single or multi-zone? 

Some thermostats, ceiling assemblies, and control boxes only support specific zone configurations. 

Check: 

• Existing thermostat settings
• Number of controlled areas
• Current control box capabilities

3. Will my existing thermostat work?

Compatibility may depend on: 

• Control box
• Rooftop unit generation
• Zone configuration
• Heat functions
• And more

Remember that two visually identical thermostats may support completely different functions. 

4. Does my system require a control box? 

Some rooftop units or ceiling assemblies include integrated control boxes while others require a separate one to be added during installation. At RV Products Shop, we list all required components on each Furrion rooftop unit listing. 

Controllers need to match: 

• Thermostat
• Rooftop unit
• Zone setup
• Additional functions (such as heating or other smart features)

5. Do I need supplemental heating?

If you frequently travel or camp during the spring or fall seasons, you may want to consider a heat pump or heat strip. These supplemental heating options can help cut energy costs by reducing propane usage. It is important to remember that these options are NOT meant to completely replace a furnace in temperatures below ~40°F.

If you exclusively travel during the summer, heating options may not be a priority. In this case, you may decide to choose an AC only system. 

6. Do I need to replace more than one component?

Changing one component can sometimes affect others, especially when replacing the rooftop unit. 

For example, replacing a rooftop unit may require also replacing: 

• Thermostat
• Control box
• Ceiling assembly
• Other accessories

7. What type of refrigerant does my rooftop unit use?

Due to updates from the EPA on refrigeration requirements, compatibility has become even more confusing. As of 1/1/2026, manufacturers are no longer permitted to produce or sell products containing R410A, which has been the industry standard for many years. Most RV HVAC manufacturers have switched to R32 refrigerant, which has different safety requirements. Some companies have designed their updated rooftop units to be backwards compatible with R410A components, while others have decided to keep all components separated by refrigerant type. 

This change may affect the compatibility of all system components. When replacing or upgrading any part of your system, it is important to verify which refrigerant type the component was designed for so you can be confident when making upgrades or replacements. 

For more information, you can read our blog post "R32 vs R410A Refrigerant"

Many replacement issues are caused by a compatibility issue rather than a defective component. A few extra minutes spent on verifying compatibility can save hours of troubleshooting as well as costly returns and replacements. 

If you feel comfortable, you can begin comparing systems. To make it easier to choose the correct components the first time, we have included a compatibility section on all of our rooftop unit product pages. There you can find a list of all required components with links to each compatible product in our store. If you still have questions, you can always reach out to us through our contact page for additional guidance. 

If you would like to continue learning, you can read our post on "Noise Levels & Comfort". There you will learn about what factors influence the comfort level of your RV and which features to prioritize for maximum comfort. 

It doesn't matter if you're a seasoned traveler or you just bought your first RV, replacing or upgrading an RV climate control system can be overwhelming. Between BTU ratings, refrigerant changes, and thermostats that look identical but are actually completely different, replacements and upgrades are often more complicated than a simple swap. 

At RV Products Shop, we have been helping RV owners choose replacement air conditioners, verify compatibility, and understand RV climate control systems for over a decade. We have created this guide to bring together some of the most helpful information and knowledge that we have collected over the years to help you feel confident that you are choosing the right system. 

Follow the links below for beginner-friendly explanations on a variety of topics. 

How RV Air Conditioners Work

Learn about the different components involved in an RV HVAC system

Choosing the Right BTU Size

Understand cooling capacity, general sizing recommendations, and factors that affect cooling requirements. 

Ducted vs Non-Ducted Systems

Learn how airflow is distributed and identify which system your RV has.

Single Zone vs Multi-Zone

Understand the different ways to control the temperature inside your RV. 

Heat Pumps vs Heat Strips

Compare supplemental heating options and learn which one is best for your system. 

Understanding Compatibility

Learn what to check before replacing any system component. 

Noise Levels & Comfort

Explore variable-speed compressors, cycling behavior, and other comfort-related features. 

Generator & Power Requirements

Understand startup surge and other factors that affect generator compatibility. 

Common RV HVAC Buying Mistakes

Avoid common compatibility, sizing, and installation issues. 

Matching HVAC Systems to Different Needs

Compare different scenarios to find the optimal system.

Once you've browsed these articles, you should have a much better idea of what you want from your RV HVAC system. If you feel like you're ready to choose your system, you can browse our collection of Furrion rooftop units. Every product page includes compatibility information and lists all required components to make sure you order all the right components the first time. 

Sometimes, but not always. The rooftop unit must be compatible with all other system components. Compatibility can depend on refrigerant type, connector type and wiring, and functions supported by the control box and thermostat. 

Learn more: Understanding Compatibility

The industry standard is a 14" x 14" roof opening, so almost all rooftop units will be designed with this in mind. However, compatibility also depends on roof thickness and other system components. 

Learn more: Understanding Compatibility

For many people, yes. Heat pumps can help reduce costs by lowering propane usage, and may be sufficient as a standalone heat source in especially mild temperatures. 

Learn more: Heat Pumps vs Heat Strips

Modern RV HVAC systems have updated communication protocols between components, along with more features and functionality options. There's a good chance that a thermostat designed to work with an older system will not be compatible with newer components, including the rooftop unit. 

Learn more: Understanding Compatibility

RV size is only one factor. Climate, insulation quality, ceiling height, and the number of occupants all affect your cooling needs. 

Learn more: Choosing the Right BTU Size

Yes, as long as the generator is capable of handling the startup surge of the rooftop unit along with all other appliances that will be running simultaneously. 

Learn more: Generator and Power Requirements

Many RV HVAC systems can provide more than just cooling alone. Depending on the setup, some systems offer heat pump functionality or support optional heat strips to provide supplemental heating during cooler temperatures. 

While both can help reduce propane usage, they are not meant to completely replace a furnace in colder climates. 

In many cases, yes. 

Because both systems use electricity rather than propane, they may help reduce furnace usage during cooler weather. When staying at campgrounds where electricity is included, using a heat pump or heat strip when conditions allow may lower propane consumption and reduce heating costs. 

Actual savings willl vary depending on outdoor temperatures, campground power availability, and how much heating is needed. 

It is important to remember that neither can completely replace a furnace during intense or prolonged cold weather or freezing temperatures. 

A heat pump might be the better choice if: 

• You frequently travel during spring or fall
• You are replacing an existing rooftop unit
• You would like to avoid installing additional add-on parts

A heat strip may be the better choice if: 

• You only need occasional supplemental heat
• You want to add heating capabilities without replacing an existing rooftop unit
• You're looking for a lower-cost heating upgrade

Now that you've decided which type of supplemental heating is the best fit for you, you can begin comparing different rooftop units. All of our rooftop unit pages include a compatibility section to help you choose the right components the first time, with no guessing or digging through product manuals. 

If you'd like to continue learning before diving in, you can read our next article: "Understanding Compatibility"

When shopping for replacement rooftop units, thermostats, ADBs, or entire systems, you will encounter the terms "single zone" and "multi-zone." These terms refer to where air moves inside the cabin. This is different from ducted vs non-ducted systems, which refer to how air moves. 

For example: 

• Ducted vs non-ducted: How does cooled or heated air travel?
• Single zone vs multi-zone: How many areas can be controlled independently? 

A ducted RV can be either single zone or multi-zone, while non-ducted systems are generally considered single zone. 

Example Scenarios

• Ducted + single zone: Air moves through ceiling ducts to multiple vents, but the thermostat controls the entire RV at one set temperaure. 
• Ducted + multi-zone: Air moves through ceiling ducts, and separate areas can maintain different temperatures. 

Your system is multi-zone if: 

• The thermostat displays multiple zones
• Different areas can be controlled independently 

Your system is single zone if: 

• The thermostat only displays one temperature zone for the entire RV
• Temperature settings apply everywhere equally

In many cases, yes, as long as you have a ducted system. 

Converting from a single zone system to multi-zone often requires replacing several components. This can include the control box, thermostat, and ceiling assembly. 

Before upgrading, verify which existing components are compatible with multi-zone controls and which ones will need to be replaced. To make it easy, all of our rooftop unit product listings includes a compatibility section that lists the exact components needed for each configuration. 

To learn more, you can read our post "Understanding Compatibility"

Thermostats, control boxes, and other components are not always interchangeable between zone configurations. Some units support either single zone or multi-zone only, and others can be used in either. 

Single zone and multi-zone systems are designed around comfort needs rather than cooling power. Understanding which setup your RV uses makes compatibility checks much easier when replacing any component in your system. 

Now that you've determined whether your RV should use a single or multi-zone system, you can begin comparing rooftop units and compatible components. All of our product pages include a compatibility section to help you choose the correct components for your particular setup. 

If you would like to continue learning before comparing systems, you can read our next post: "Heat Pumps vs Heat Strips"

Another important factor when replacing or upgrading an RV air conditioner is whether the existing system is ducted or non-ducted. This distinction affects airflow, installation requirements, and compatibility.

A ducted system routes cooled or heated air throughout concealed air ducts and distributes it throughout different areas of the RV. These systems are common in larger travel trailers, fifth wheels, and motorhomes. 

One example of the way air flows through a ducted system

Understanding whether your system is ducted or non-ducted can help prevent compatibility issues when replacing any component of your system. Some components are designed specifically for one setup, and others are meant to be support either one. Choosing the correct components for your particular setup is crucial for proper system performance. 

Once you've determined the configuration used in your RV, you can begin comparing compatible rooftop units. All of our products include supported installation types along with a compatibility section to help you select the correct components.

Now that you've learned the difference between ducted systems and a non-ducted systems, the next step is understanding the different ways to manage the climate inside your RV. 

Some systems maintain one set temperature throughout the coach, while others allow different areas to be controlled independently. To learn more, continue to our next article "Single Zone vs Multi-Zone"

When shopping for a rooftop unit, one of the first specifications you'll encounter is BTU (British Thermal Unit). In simple terms, BTU measures how much heat an air conditioner can remove from your RV in one hour. Higher BTU ratings generally provide greater cooling capacity, but bigger is not always better. 

Choosing too few BTUs can leave your system running continuously while struggling to maintain the set temperature. Choosing too many can cause short cycling, which is when the unit cools quickly and shuts off before properly removing humidity from the air. This can reduce efficiency and make your living space feel damp and uncomfortable. 

That being said, BTU ratings are less of a factor when discussing variable speed air conditioners. These units adjust their cooling output as needed, which helps maintain more consistent temperatures while simultaneously eliminating the problem of short cycling. This means that variable speed systems with high BTU ratings can be compatible with almost any setup. 

These ranges are a general starting point. Other factors such as insulation quality, climate, and layout also impact cooling needs. 

Another commonly used starting point is 20 BTUs per square foot, but real world RV cooling needs often vary more than household spaces. 

You may need to upgrade to a system with a higher BTU rating if you notice: 

• The AC runs continuously but struggles to maintain the set temperature
• The interior remains warm during peak afternoon heat
• Cooling feels uneven between rooms or zones
• High humidity inside the RV
• Your generator or power system appears strained during operation

These issues do not always mean that you need a larger unit, but it may be worth evaluating if the system is otherwise working properly and other issues have been ruled out. 

Different systems are designed with different priorities in mind. 

Furrion Chill HE systems are often a practical choice for a small to mid-sized RV, balancing cooling performance with modern features and efficiency. These units feature a traditional fixed speed system, which makes it very important to match the BTU rating to the appropriate application. 

Furrion Chill Cube 18K systems may be more appealing to RV owners dealing with hotter climates, larger interiors, or higher cooling demands. Features such as variable-speed operation can improve efficiency, reduce noise, and provide steadier cooling under a higher load. These units are also more efficient at removing humidity even while operating at a slower speed. This makes the issue of short-cycling less of a concern and allows for a greater range of applications. 

The "best" BTU size is not always the highest number. A properly matched system often performs better, uses less power, and provides a more comfortable experience. 

Now that you've determined the best BTU rating for your needs, the next step is choosing a system that's compatible with your RV. 

If you're still unsure how to select the right system, you can read "Ducted vs Non-Ducted Systems"

If you feel confident comparing systems, you can browse our collection of Furrion Rooftop Air Conditioners and Heat Pumps, where each product listing includes compatibility information to help you select the right components.