The Complete Guide to RV Air Conditioning & Cooling
An RV without working air conditioning in July is just a very expensive sauna on wheels. Whether you’re boondocking in the Arizona desert, pulling into a full-hookup campground in the humid Southeast, or parked at a national park with only 30-amp service, your AC system is the single biggest factor in whether you actually enjoy the trip or spend it sweating through your sheets at 2 a.m.
This guide covers everything you need to know about RV air conditioning and cooling: the different types of AC units available, how to size them properly for your rig, the ducted vs. non-ducted debate, why soft start kits matter more than ever, power requirements for various camping scenarios, and which brands are worth your attention. By the end, you’ll know exactly what your RV needs to stay cool no matter where you park it.
Types of RV Air Conditioners
RV air conditioning has evolved far beyond the single rooftop box that rattled your fillings every time the compressor kicked in. Today there are several distinct categories, each designed for different rigs, budgets, and camping styles.
Rooftop (Non-Ducted)
The most common setup on travel trailers, pop-ups, and smaller fifth wheels. A rooftop non-ducted unit sits on the roof in the standard 14” × 14” opening and blows cool air straight down through an air distribution box (ADB) mounted to the ceiling inside. Installation is straightforward, maintenance is accessible since the ADB is right there on the ceiling, and replacement only requires swapping the unit and matching the wiring. The trade-off is that cooling concentrates in the area directly below the unit, which can create hot and cold spots in larger rigs. Most units in this category range from 13,500 to 15,000 BTU.
Rooftop (Ducted)
Ducted systems use the same rooftop compressor unit but route the cooled air through a network of ducts hidden in the ceiling, distributing it to vents throughout the RV. This delivers more even temperatures across multiple rooms and runs noticeably quieter since the ductwork dampens fan noise. Ducted systems are standard on larger fifth wheels, Class A motorhomes, and many mid-range and up travel trailers. The downside is that ductwork adds restriction, which can reduce effective BTU output by 10-15% compared to non-ducted units at the same rating. Replacement and maintenance are also more involved.
12V DC Units
The fastest-growing category in RV cooling. Conventional RV AC units run on 120V AC power, meaning you need shore power, a generator, or a beefy inverter. The new generation of 12V DC units—from brands like Dometic (RTX series), OutEquip, and several Chinese manufacturers now on Amazon—run directly off your battery bank. By skipping the DC-to-AC conversion through an inverter, they eliminate the 15-20% energy loss that conversion creates. Variable-speed compressors sip as little as 16-20 amps on eco mode, making solar-powered RV air conditioning genuinely practical for the first time. Units in this category typically range from 8,000 to 12,000 BTU, best suited for camper vans, smaller trailers, and as supplemental cooling in larger rigs.
Portable & Window Units
Battery-powered portable AC units like the Zero Breeze Mark 3 have carved out a niche for van lifers and tent campers who want spot cooling without a permanent rooftop installation. Window-mounted units adapted from residential use can work in RVs with the right opening dimensions. These are typically lower capacity (5,000-10,000 BTU) and work best as supplemental cooling or for very small spaces. They offer maximum flexibility—you can move them between rigs or even use them outside your RV under an awning.
Mini-Split Systems
Residential-style mini-splits are finding their way into high-end custom builds, particularly in larger Class A coaches and luxury fifth wheels. They offer exceptional efficiency (SEER ratings of 20+), whisper-quiet operation, precise temperature control, and multi-zone capability. The trade-off is significantly more complex installation, higher upfront cost, and they require professional servicing. For most RVers, traditional rooftop units are the practical choice, but if you’re doing a custom build and plan to full-time, mini-splits are worth investigating.
BTU Sizing: How Much Cooling Power Do You Actually Need?
Getting the BTU sizing right is the single most important decision in RV air conditioning. Undersized and your unit runs constantly, never catches up on a hot day, and burns out prematurely. Oversized and it short-cycles, cooling too fast without removing humidity, leaving you clammy and promoting mold growth. RVs need dramatically more cooling power per square foot than a house—typically 60 to 80 BTU per square foot compared to 20-30 BTU for residential spaces, because RV walls are thinner, roofs absorb massive solar heat, and windows make up a much larger percentage of the exterior surface.
| RV Type | Length | Recommended BTU | Units Needed |
|---|---|---|---|
| Pop-Up / Teardrop | Under 16 ft | 8,000 – 11,000 | 1 |
| Small Travel Trailer | 16 – 22 ft | 11,000 – 13,500 | 1 |
| Mid-Size Travel Trailer | 22 – 28 ft | 13,500 – 15,000 | 1 |
| Large Travel Trailer / 5th Wheel | 28 – 36 ft | 15,000 + 13,500 | 2 |
| Class B Camper Van | 17 – 22 ft | 8,000 – 13,500 | 1 |
| Class C Motorhome | 22 – 32 ft | 13,500 – 15,000 | 1–2 |
| Class A Motorhome | 30 – 45 ft | 15,000 × 2 | 2 |
Several real-world factors swing your BTU requirement by 30% or more in either direction. Dark roof colors absorb up to 40% more solar heat than white roofs. RVs built before 2015 generally have thinner insulation and single-pane windows. Each slide-out adds 15-40 square feet of living space and cooling load. Groups of four or more people add body heat worth an extra 1,000-1,500 BTU. And camping above 95°F in direct sun is a completely different challenge than parking in a shaded campsite in the Pacific Northwest.
Ducted vs. Non-Ducted: Which Setup Is Right for Your Rig?
This is one of the most debated topics in RV cooling, and the answer depends almost entirely on your rig’s size, layout, and how it was built. In most cases, you’re working with whatever the manufacturer installed unless you’re doing a custom build or major renovation.
● Ducted Systems
Even temperature distribution across multiple rooms through ceiling vents.
Quieter operation since ductwork dampens compressor and fan noise in the cabin.
Concealed hardware maintains clean interior ceiling aesthetics.
Airflow restriction through ducts can reduce effective cooling output by 10-15%.
More complex and expensive to install, maintain, and replace.
● Non-Ducted Systems
Stronger direct cooling output with no ductwork restriction on airflow.
Simpler installation and easier filter access for maintenance.
Lower purchase and installation cost compared to ducted equivalents.
Cooling concentrates in one area, creating potential hot and cold spots.
Louder inside the cabin since the ADB sits directly on the ceiling with no dampening.
For rigs under 28 feet with open floor plans, non-ducted systems deliver strong, efficient cooling exactly where you need it without the cost and complexity of ductwork. For rigs over 30 feet with separate bedrooms, a kitchen zone, and a living area, ducted systems earn their keep by maintaining uniform temperatures throughout. Many larger rigs use a combination: a ducted main unit covering the living and kitchen zone, and a second non-ducted unit in the bedroom for targeted cooling at night.
Inverter vs. Conventional Compressors
Traditional RV AC units use single-speed compressors that cycle on and off—full blast cooling until the thermostat is satisfied, then completely off until the temperature climbs again. That on-off cycling produces the familiar thud every time the compressor kicks in, draws heavy startup current, and creates temperature swings in the cabin.
Inverter-driven variable-speed compressors represent the biggest advancement in RV cooling technology in the past decade. Instead of slamming to full power and back, they continuously adjust their speed to match the heat load. When the cabin is close to the set temperature, the compressor throttles down to a whisper. When you park in full sun at 105°F and open the door after a hike, it ramps up to maximum output. The benefits are substantial: dramatically quieter operation, smoother temperature maintenance, lower power consumption (many inverter units have built-in soft start capability, eliminating the need for a separate kit), and longer compressor life. Brands leading the inverter RV AC category include Furrion with their Chill Cube series, TURBRO with their Greenland line, and Dometic with the FreshJet platform.
Heat Pump Capability: Year-Round Climate Control
Many modern RV AC units include a heat pump function that reverses the refrigeration cycle to produce warm air instead of cool air. This transforms your rooftop AC into a year-round climate control system, useful for shoulder-season camping when nights drop into the 40s and 50s but don’t warrant firing up the propane furnace. Heat pump mode is significantly more energy-efficient than resistive electric heaters and doesn’t consume propane, which matters when you’re dry camping.
The limitation is that heat pumps become less effective as outside temperatures drop below about 40°F, and most stop producing useful heat below 25-30°F. For true cold-weather camping, you’ll still rely on your propane furnace. But for fall and spring trips, a heat pump adds meaningful comfort without any additional equipment. Models from TOSOT, RecPro, TURBRO, and Dometic offer heat pump options in the $$-$$$ tier.
Soft Start Kits: The Best Upgrade You Can Add
If there’s one upgrade that every RV owner running an older non-inverter AC should consider, it’s a soft start kit. When a conventional RV AC compressor fires up, it demands a massive surge of power—typically 45-60 amps at 120V for a fraction of a second. That surge trips breakers at underpowered campgrounds, stalls smaller generators, and physically jolts the RV with a loud thud. A soft start kit electronically ramps up the compressor voltage gradually, reducing that startup surge by 60-75%.
Run AC on Smaller Generators
Start a 15,000 BTU AC on a Honda 2200 or equivalent 2,000W inverter generator that would otherwise stall on the startup surge.
Dual AC on 30-Amp Service
Run two rooftop AC units on 30-amp shore power by staggering compressor starts. Without soft start, this is impossible on a 30-amp circuit.
Battery-Powered Cooling
Start your AC from a lithium battery bank through an inverter without overloading the system during the startup spike.
Compressor Longevity
Smoother starts reduce mechanical stress on the compressor, extend its service life, and eliminate the RV-shaking thud on every cycle.
The leading soft start brands include Micro-Air (EasyStart Breeze), SoftStartRV, SoftStartUP, and RecPro. Most are DIY-installable in under an hour—you’re essentially wiring the device between your compressor’s run, start, and common wires inside the rooftop shroud. Note that many newer inverter-based AC units (like the Furrion Chill Cube and TURBRO Greenland series) have soft start technology built in, so a separate kit isn’t necessary.
Shop RV Soft Start Kits
The single best upgrade for older RV AC units. Reduce startup power by 60-75% and run AC on smaller generators.
Power Requirements: What Your RV’s Electrical System Needs
Understanding power draw is critical before choosing or upgrading your RV AC system. Here’s what the numbers actually look like for the most common unit sizes:
| Unit Size | Starting Watts | Running Watts | Running Amps (120V) |
|---|---|---|---|
| 11,000 BTU | 2,200 – 2,800 | 1,100 – 1,300 | ~10A |
| 13,500 BTU | 2,800 – 3,500 | 1,400 – 1,600 | ~12-13A |
| 15,000 BTU | 3,500 – 5,100 | 1,500 – 1,700 | ~14A |
| 12V DC (10,000 BTU) | N/A (no surge) | 800 – 1,200 | 16-40A @ 12V |
A 30-amp shore power connection delivers a maximum of 3,600 watts (30A × 120V), which comfortably runs one AC unit but cannot handle two simultaneously—the combined starting wattage alone would exceed the circuit capacity. A 50-amp connection provides two 50-amp legs (effectively up to 12,000 watts), easily supporting dual AC units plus your other appliances. For generator-powered camping, you need at minimum a 3,000-3,500W generator for a single AC unit, or a soft start kit to bring that requirement down to the 2,000-2,200W range.
Brands Worth Knowing
The RV AC market has expanded dramatically beyond the two or three brands that dominated for decades. Here’s a snapshot of the major players and what each brings to the table.
Dometic remains the 800-pound gorilla in RV climate control. Their lineup spans from the workhorse Brisk II to the premium FreshJet series (with industry-leading SEER ratings) to the RTX line of 12V DC units for off-grid camping. Parts availability is unmatched, and every RV technician knows their way around a Dometic unit. The Penguin II holds the crown for low-profile rooftop units, sitting at just 10-11 inches above the roofline—ideal for rigs with clearance concerns.
Coleman-Mach (Airxcel) is the other legacy brand with massive market share. The Mach 3 Plus is arguably the quietest conventional rooftop AC in the industry, and the Mach 15 delivers 15,000 BTU with the largest fan motor in its class. Coleman units are known for straightforward reliability and excellent parts support across the dealer network.
Furrion has emerged as the technology leader with their Chill Cube series—variable-speed inverter compressors, integrated soft start, and the highest BTU output (up to 18,000) in a rooftop package. Their VibrationSmart technology reduces internal component wear, and ClimateSmart keeps the unit performing in temperature extremes. Furrion has become the OEM choice for several major RV manufacturers including Forest River and Keystone.
TOSOT brings aggressive value with their GO Cool line, which packs heat pump capability and high BTU ratings at mid-range pricing. Their 16,000 BTU unit with 12,500 BTU heat pump covers a wider temperature range (down to -5°F for heating) than most competitors.
RecPro targets the replacement market with quiet, full-featured units at competitive pricing. Their 13,500 and 15,000 BTU models include heat pump capability and come in both ducted and non-ducted configurations. At 59.7 dB, the RecPro 13.5K is one of the quietest units in its class.
TURBRO pioneered affordable inverter-driven RV AC with their Greenland and Finnmark lines. Their non-ducted units feature LED ambient lighting (a surprisingly popular feature for nighttime ambiance), WiFi control, and variable-speed compressors that eliminate the need for a separate soft start kit. TURBRO has carved a strong position in the aftermarket replacement segment.
Fogatti has grown rapidly with their InstaCool series, ranging from 13,500 to 18,000 BTU with WiFi and Alexa integration. They offer both ducted and non-ducted configurations and include phone technical support with every purchase, backed by a 24-month warranty.
Shop RV Air Conditioners
From budget-friendly replacements to high-performance inverter units with heat pumps. All major brands available.
Summer Maintenance & Cooling Tips
Your AC unit can only perform as well as you maintain it. A few seasonal habits make the difference between a unit that struggles and one that keeps you comfortable even on triple-digit days.
Clean or replace filters monthly during heavy use. The intake filter on your ADB collects dust, pet hair, pollen, and campfire smoke residue. A clogged filter restricts airflow across the evaporator coil, reducing cooling output and forcing the compressor to work harder. Most non-ducted ADB filters pop out in seconds for cleaning. Ducted systems have filters at the return air vent that are equally easy to access.
Inspect the rooftop shroud and coils annually. Pull the plastic shroud on the roof and look at the condenser coils. Leaves, bugs, cottonwood seeds, and road grime clog the fins over time, insulating them from airflow. A careful rinse with a garden hose (not a pressure washer) and a coil-cleaning spray restores cooling performance. While you’re up there, check the rubber gasket between the unit and the roof for cracks or gaps that could leak water.
Park smart when possible. Orienting your RV to minimize direct sun exposure on the side with the most windows makes a measurable difference in cooling load. Trees, awnings, and reflective windshield covers all reduce the heat your AC has to fight. A white roof coating or reflective cover can reduce roof surface temperature by 30°F or more compared to a dark roof.
Use vent fans to assist your AC. A quality roof vent fan (like a MaxxAir or Fan-Tastic) working in conjunction with your AC creates airflow that distributes cooling more evenly and helps pull hot air out of high points in the cabin. This is especially effective in non-ducted setups where cooling concentrates in one area.
Consider an AC cover for storage. When your RV is stored between trips, a rooftop AC cover protects the condenser coils, shroud, and internal components from UV degradation, debris buildup, and moisture. Remove the cover before running the unit—operating with the cover on will overheat the compressor.
Shop RV AC Maintenance Essentials
Filters, coil cleaners, AC covers, and soft start kits to keep your system running at peak performance.
Frequently Asked Questions
What size air conditioner do I need for my RV?
As a general rule, RVs under 24 feet need 13,500 BTU, 25-32 feet need 15,000 BTU, and rigs over 32 feet typically require dual units. Use 60-80 BTU per square foot of interior living space as your baseline, then add 20-30% if you camp in extreme heat above 95°F. Slide-outs, dark roofs, older insulation, and large groups of occupants all increase the load. Use the sizing table above for specific RV types.
What is a soft start kit for an RV air conditioner?
A soft start kit is an electronic device that reduces the startup power surge of your RV AC compressor by 60-75%. This lets you run AC on smaller generators (like a Honda 2200), run two AC units on 30-amp service, start AC from a lithium battery bank through an inverter, and reduces wear on your electrical system and compressor. Brands like Micro-Air EasyStart, SoftStartRV, and RecPro make kits that most RV owners can install themselves in under an hour.
What is the difference between ducted and non-ducted RV air conditioners?
Ducted systems distribute cool air through ceiling ductwork to multiple vents throughout the RV, providing quieter and more even cooling ideal for rigs over 30 feet with separate rooms. Non-ducted systems blow air directly from a ceiling-mounted air distribution box into the space below, making them simpler to install and maintain but louder and less even in larger rigs. Most RVs come with one system already installed, and switching between the two requires significant modification.
Can I run my RV air conditioner on solar power?
Yes, particularly with the new generation of 12V DC air conditioners. A unit like the Dometic RTX 2000 drawing 16-20 amps on eco mode can run on a 400W+ solar array paired with a lithium battery bank of at least 200Ah during daylight hours. Conventional 120V AC units require an inverter and significantly more solar and battery capacity, making them impractical for solar-only operation in most setups. The solar-powered AC equation improves every year as battery and panel prices continue to drop.
How much power does an RV air conditioner use?
A standard 13,500 BTU rooftop AC uses about 2,800-3,500 starting watts and 1,400-1,600 running watts, drawing approximately 12-13 amps at 120V. A 15,000 BTU unit needs roughly 3,500-5,100 starting watts and 1,500-1,700 running watts. A single unit fits within 30-amp shore power (3,600W max), but running two units simultaneously requires 50-amp service or soft start kits. Newer inverter units with variable-speed compressors use considerably less power during partial-load operation.
Wrapping Up
RV air conditioning technology has come a long way from the one-speed, power-hungry rooftop boxes that dominated the market for decades. Whether you’re replacing a worn-out unit, upgrading to inverter technology, adding solar-powered 12V cooling for boondocking, or simply trying to understand what your current system needs to perform its best, the fundamentals come down to four things: right-sizing the BTU capacity for your rig and climate, choosing the distribution method (ducted or non-ducted) that matches your layout, ensuring your electrical system can support the load, and maintaining the system so it delivers its full rated performance.
If you’re running an older non-inverter unit, a soft start kit is the single highest-value upgrade you can make—it expands your camping options, protects your equipment, and typically pays for itself within a season. And if you’re shopping for a new unit, the inverter-driven models from Furrion, TURBRO, and Dometic offer a genuinely better experience in every measurable way: quieter, more efficient, smoother temperature control, and built-in soft start capability.
Stay cool out there.