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RV Air Conditioner Sizing Calculator: BTU, Amps, and Generator Requirements

Built and reviewed by (MBA Finance) · Updated October 2026

Most RV AC guides give you a single BTU number and call it done. This calculator gives you the full picture: heat load by climate zone, the right rooftop unit size, how many amps it draws on 30A or 50A service, what size generator you need, and whether a soft-start kit lets you drop to a smaller, quieter gen.

❄️ RV Specs and Climate Inputs
📐 Interior Floor Space
sqft
Measure actual interior floor dimensions. Exclude the hitch/tongue from length. Add slide-outs below.
sqft
ft
Vans: 5.5-6 ft | Travel trailers: 6.5 ft | Class A: 7-7.5 ft
🌡️ Climate and Conditions
people
Each person adds ~600 BTU of body heat load.
🔌 Power and Generator
A soft-start kit reduces startup amps by up to 70%, allowing use with smaller generators.
📊 AC Sizing Analysis
❄️
Enter your RV square footage, climate zone, and power setup. The calculator shows BTU heat load, recommended AC unit size, amp draw, shore power check, and generator sizing with soft-start analysis.

Why Do Most RV AC Sizing Rules Get the BTU Number Wrong?

The most common mistake in RV air conditioner sizing is applying the same formula used for houses. Home HVAC calculators often start at 18 to 20 BTU per square foot. Some RV guides repeat this number without adjusting for the fundamental differences between a stick-built house and a metal or fiberglass box on wheels that sits in direct sun with thin aluminum walls and large single-pane windows on every side.

The correct baseline for RV cooling is 35 to 45 BTU per square foot, with adjustments for climate, insulation quality, and sun exposure that can push the effective rate to 60 BTU per square foot or higher in the Arizona desert. This calculator uses 40 BTU per square foot as its starting point, then applies climate, insulation, and sun multipliers that reflect real-world RV performance data rather than residential HVAC assumptions.

The Four Factors That Move Your BTU Number by 30 Percent or More

Climate zone is the single biggest variable. An RV parked in Phoenix, Arizona in July needs roughly 55 percent more cooling capacity than the same RV parked in Bend, Oregon in July. Not a little more. Fifty-five percent more. An RV that can get by with one 13,500 BTU unit in the Pacific Northwest needs the full capacity of a 15,000 BTU unit or a second unit entirely in the desert Southwest. Sizing for your most comfortable camping destination and then driving to Phoenix is a recipe for a sleepless, sweaty night in a campground.

Insulation quality is the second major variable. A premium 2022 Grand Design Reflection fifth wheel with spray foam insulation throughout the walls and ceiling has dramatically better thermal performance than a 2003 Forest River travel trailer with fiberglass batts and thin luan walls. This calculator adjusts the BTU requirement by up to 45 percent based on insulation quality, which is more than enough to move you between AC unit size classes. If you are shopping for a new RV and spend significant time in hot climates, insulation quality is worth prioritizing over floor plan layout.

Why Slide-Outs Add More Cooling Load Than Their Square Footage Suggests

A large bedroom slide-out adds 30 to 50 square feet of interior floor space. But it also adds four more wall surfaces, a floor transition, and a ceiling section that is directly under the exterior roof with no air gap. The thermal performance of slide-out walls is typically worse than the main body of the RV because slide-outs have thinner construction and more seams. This calculator adds the floor area of your slide-outs to your total square footage, which accounts for the increased cooling burden without requiring you to calculate wall surface areas separately.

The Occupant Heat Load Most Calculators Skip

A resting adult generates approximately 400 BTU of body heat per hour. An active adult generating heat through cooking, moving around, or working generates 600 to 800 BTU per hour. A family of four in a 200-square-foot travel trailer adds 1,600 to 2,400 BTU of heat load to the space, which is equivalent to the output of a small electric space heater. This calculator adds 600 BTU per occupant to the total heat load, which is a conservative estimate that appropriately reflects the human heat contribution in a small, enclosed RV space.

How This Calculator Works: Square Footage, Climate, and Power Load

The calculation runs in three stages: heat load estimation, AC unit sizing, and power requirement calculation. Each stage outputs actionable numbers, not just a category label.

Stage 1: Total BTU Heat Load Calculation

The base heat load is calculated as total interior square footage (including slide-outs) multiplied by 40 BTU per square foot. Four multipliers are then applied in sequence: a climate factor ranging from 0.85 for mild conditions to 1.55 for extreme desert heat; an insulation factor ranging from 0.78 for excellent four-season insulation to 1.20 for poor insulation; a ceiling height factor that increases with height above the standard 6.5-foot baseline; and a sun exposure factor ranging from 0.92 for full shade to 1.15 for full sun. Occupant body heat is added as a flat 600 BTU per person. The result is your total cooling demand in BTU per hour.

Stage 2: AC Unit Selection and Dual-Unit Threshold

The calculated BTU demand is compared against standard rooftop RV AC sizes: 9,500 BTU, 11,000 BTU, 13,500 BTU, and 15,000 BTU. The calculator recommends the smallest unit that meets or exceeds the demand with a comfortable margin. When the calculated demand exceeds 15,000 BTU, a single rooftop unit cannot meet the load and two units are recommended. The 13,500 BTU size dominates the market and fits the widest range of RV roof openings. The 15,000 BTU unit fits the same 14-by-14-inch standard roof opening and is a straightforward upgrade.

Stage 3: Power Requirements and Generator Sizing

Running wattage is based on manufacturer-published electrical specifications for each BTU size class. Startup surge (the momentary current spike when the compressor starts) is approximately 3 to 4.5 times the running wattage for a standard hard-start compressor. With a soft-start kit, startup surge drops to approximately 1.3 to 1.5 times running wattage. The minimum generator size is the greater of: startup surge watts or running watts plus 25 percent headroom. Shore power adequacy is checked by comparing running watts to 80 percent of the available shore power capacity (the continuous load limit under the NEC 80 percent rule).

Three Real US RV Cooling Scenarios with Full BTU and Power Numbers

Setup 1 in Phoenix, AZ: 28-ft Travel Trailer in Extreme Heat

Carlos and his wife camp at Usery Mountain Regional Park near Phoenix in late May before crowds arrive. Their 2018 Keystone Cougar 28-ft travel trailer has 210 sqft of interior floor space, average insulation, and sits in a full-sun campsite with no shade. They have two adults and typically reach 108 degrees Fahrenheit on their worst afternoons. The RV came with a factory 13,500 BTU unit.

InputValue
Base heat load (210 sqft x 40 BTU)8,400 BTU
Extreme climate factor (x1.55)13,020 BTU
Average insulation (x1.0)13,020 BTU
Full sun exposure (x1.15)14,973 BTU
Occupant load (2 people x 600)+1,200 BTU
Total heat load16,173 BTU
RecommendedTwo units OR one 15,000 BTU + upgraded insulation
Factory 13,500 BTU unitUndersized by 2,673 BTU – struggles in afternoon heat

Carlos’s factory 13,500 BTU unit is undersized by nearly 2,700 BTU for his Phoenix conditions. This explains why his AC runs continuously in the afternoon and the interior temperature still climbs to 82 to 84 degrees. The correct recommendation is either a second 9,500 BTU unit added to the roof, or a move to a 15,000 BTU unit as a direct replacement. Adding a reflective roof cover or parking in shade when available would reduce the effective load back into the single-unit range.

Setup 2 in Ocala, FL: Class A 40-ft Motorhome on 50-Amp Service

Sandra and her husband full-time in a 2021 Tiffin Allegro Bus 40-ft Class A diesel pusher at Ocala National Forest campground. The motorhome has 350 sqft of interior space, two large slide-outs adding 70 sqft, 7.5-ft ceilings, good insulation, and partial shade from the surrounding Florida pines. They typically see peak temperatures of 92 to 96 degrees Fahrenheit. The Tiffin came factory-equipped with two 15,000 BTU rooftop units on 50-amp service.

InputValue
Interior + slide-outs (420 sqft total)420 sqft
Base heat load (420 x 40)16,800 BTU
Moderate-hot climate (x1.25)21,000 BTU
Good insulation (x0.88)18,480 BTU
7.5 ft ceiling factor (x1.12)20,698 BTU
Partial sun (x1.0), 2 people (+1,200)21,898 BTU
Total heat load21,898 BTU
Factory dual 15,000 BTU (30,000 total)Adequate – 8,102 BTU margin remaining
Running power (2 units)3,120 W / 26.0 A at 120V
50-amp service (12,000 W available)Shore power: adequate with substantial margin

Sandra’s Tiffin is correctly sized for Florida summer conditions, with an 8,100 BTU margin that keeps both units running at moderate duty cycles rather than continuous maximum output. The 50-amp service handles the dual 26-amp combined draw comfortably. If she camps in full-sun Florida Keys conditions in August, the margin narrows but the dual 15,000 BTU system remains adequate. The key lesson: Class A motorhomes above 35 feet almost always require dual rooftop units and 50-amp service to function properly in Southern heat.

Setup 3 in Pacific Northwest: Class B Van on a 2,000W Honda Generator

Mark boondocks in his 2023 Winnebago Travato Class B van at Lake Chelan in Washington state. The van has 95 sqft of interior space, a standard 6.5-ft ceiling, average insulation, and an 11,000 BTU rooftop AC. He typically camps in partial sun at temperatures of 80 to 88 degrees in summer. He wants to run his AC while boondocking on a Honda EU2200i generator (2,200 starting watts) without tripping the overload protection.

InputValue
Total heat load (van, mild climate, 2 people)3,960 BTU
Recommended AC size9,500 BTU (mild conditions)
9,500 BTU running watts960 W / 8.0 A
9,500 BTU startup (hard start)3,600 W (exceeds 2,200W gen limit)
9,500 BTU startup (with soft-start)1,300 W (fits within 2,200W)
Soft-start kit installed?YES: Honda EU2200i can run the 9,500 BTU unit
Without soft-startHonda EU2200i trips on startup surge

Mark’s situation illustrates exactly why soft-start kits matter for boondockers. Without a soft-start, his Honda EU2200i cannot start the 9,500 BTU AC unit even though the running wattage is only 960 watts. The startup surge of 3,600 watts exceeds the generator’s 2,200-watt limit. With a MicroAir EasyStart ($200 to $250) installed, the startup surge drops to approximately 1,300 watts, which the Honda can handle comfortably. This single upgrade allows the quietest, most fuel-efficient generator class to power a rooftop AC, transforming boondocking comfort for van-lifers and Class B owners across the Pacific Northwest.

Three Expert Tips for Running RV Air Conditioning Off-Grid

Tip 1: Size Your Generator for Startup Watts, Not Just Running Watts

The most common generator sizing mistake is purchasing a generator based on the running wattage of your AC unit. A 13,500 BTU AC runs at approximately 1,365 watts, which seems to suggest a 2,000-watt generator would work. It would not. Without a soft-start kit, that same 13,500 BTU unit surges to 4,200 watts at startup, which immediately trips any generator rated below 5,000 watts. Generator specifications list both running watts (continuous capacity) and starting/peak watts (surge capacity). For AC use, your generator’s starting watt rating must exceed the AC startup surge, not just the running watts.

The practical generator minimum for each standard RV AC size without a soft-start: 9,500 BTU requires at least a 4,500-watt generator; 13,500 BTU requires at least a 5,000-watt generator; 15,000 BTU requires at least a 6,500-watt generator. With a soft-start kit, those minimums drop to approximately: 9,500 BTU with a 2,000-watt inverter generator; 13,500 BTU with a 3,000-watt inverter generator; 15,000 BTU with a 4,000-watt generator.

Tip 2: A Soft-Start Kit Is the Single Best Upgrade for Boondockers

The MicroAir EasyStart and comparable soft-start devices work by gradually ramping up the compressor motor current during startup rather than allowing the full locked-rotor amperage (LRA) surge all at once. The result is a startup current that is 60 to 75 percent lower than a standard hard start, allowing a much smaller generator to run the AC. A soft-start kit costs $200 to $300 and installs in the AC unit in approximately 20 to 30 minutes with basic electrical knowledge or a licensed RV technician. It is the most cost-effective upgrade available for boondockers who want to run AC on a fuel-efficient inverter generator.

Beyond generator compatibility, soft-start kits also reduce the voltage sag on shore power that sometimes causes lights to dim or other appliances to react when the AC kicks on. They extend compressor life by reducing the mechanical stress of abrupt full-load starts. And they allow the AC to start reliably on solar-charged lithium battery systems with 2,000 to 3,000-watt inverters, which is increasingly relevant as solar-plus-battery setups become common in the RV community.

Tip 3: Two AC Units on 30-Amp Service Is Not a Viable Configuration

A 30-amp RV service delivers 30 amps at 120 volts, or 3,600 watts maximum. A single 13,500 BTU rooftop AC draws 11 to 12 amps running. A second 13,500 BTU unit draws another 11 to 12 amps. Combined, they draw 22 to 24 amps, which is within the 30-amp limit, but only for running watts. The startup surge of the second unit, even with a soft-start, pushes the instantaneous draw to 23 to 25 amps or more, which trips the campground pedestal breaker. Many towers try to stagger their dual AC startup by leaving one off when starting the other, but this requires manual management and does not solve the problem when the thermostat automatically cycles the second unit back on during peak heat.

The practical answer for large RVs that need two AC units: upgrade to a 50-amp shore power connection if your campgrounds offer it, and install a properly wired 50-amp power inlet. A 50-amp service delivers 50 amps across two 120V legs, effectively providing 100 amps of 120V capacity, which handles dual units with room to spare for other appliances. If you own a campground membership or camp at RV parks regularly, 50-amp capability is a one-time expense that solves the dual-AC power problem permanently.

16 RV Air Conditioner Questions Answered for US Campers

A 30-foot travel trailer with approximately 220 to 240 square feet of interior floor space typically needs a 13,500 BTU rooftop AC unit for moderate climates (85 to 95 degrees Fahrenheit). In hot climates like Arizona or Texas in summer, the same trailer may need a 15,000 BTU unit or supplemental cooling. Add slide-out square footage to your base calculation and adjust for your specific climate. Most 30-foot trailers come factory-equipped with a 13,500 BTU unit, which is appropriate for typical conditions in most of the country but may struggle on extremely hot days in the desert Southwest.
You can run most RV rooftop AC units on a 2,000-watt inverter generator if you have a soft-start kit installed. Without a soft-start, the startup surge of any standard RV rooftop AC (even a 9,500 BTU unit) exceeds the 2,000-watt starting capacity of generators in that class. With a MicroAir EasyStart or similar soft-start, a 9,500 BTU AC starts at approximately 1,300 watts and runs at about 960 watts, both within the 2,200-watt rating of generators like the Honda EU2200i or Yamaha EF2200iS. A 13,500 BTU unit with a soft-start needs approximately 1,830 watts to start, which typically requires a 3,000-watt generator.
A 13,500 BTU rooftop RV air conditioner draws approximately 11 to 13 amps at 120 volts while running. The startup surge draws approximately 35 amps for a fraction of a second with a standard hard-start compressor, dropping to approximately 13 to 15 amps at startup with a soft-start kit installed. On a 30-amp shore power connection (which provides 30 amps at 120V for 3,600 watts), a single 13,500 BTU unit uses roughly 37 to 43 percent of your available capacity, leaving adequate power for other appliances in most cases. Running two 13,500 BTU units simultaneously on 30-amp service exceeds the available capacity and will trip the breaker.
A 15,000 BTU rooftop RV AC unit has approximately 11 percent more cooling capacity than a 13,500 BTU unit and draws roughly 2 to 3 more amps at 120 volts (approximately 13 amps vs 11 amps running). Both units fit the same standard 14-by-14-inch roof opening used by most RVs, making the 15,000 BTU unit a direct upgrade with no structural modifications required. The 15,000 BTU unit costs $50 to $150 more than the 13,500 BTU equivalent from the same brand. For RVs over 280 square feet or those camping regularly in temperatures above 95 degrees, the 15,000 BTU unit provides meaningfully better performance that is worth the modest additional cost and amp draw.
Most Class A motorhomes over 32 feet require two rooftop AC units for effective cooling in temperatures above 85 to 90 degrees Fahrenheit. A 40-foot Class A with 300 to 350 square feet of interior space typically needs 18,000 to 25,000 BTU of cooling capacity in moderate climates, far exceeding the 13,500 to 15,000 BTU maximum of a single rooftop unit. Most Class A motorhomes come factory-equipped with two units precisely for this reason, and 50-amp shore power service is standard on most Class A coaches to accommodate the combined electrical load. Running only one unit in a large Class A typically means the front bedroom or living room cools acceptably while the other zone remains uncomfortable.
A soft-start kit is an electronic device that installs inside your rooftop AC unit and controls how quickly the compressor motor reaches full speed. Standard AC compressors use direct-on-line (DOL) starting, where full voltage is applied immediately, causing a large current surge. A soft-start (also called a reduced-voltage starter or electronic motor starter) ramps the voltage up gradually over 1 to 3 seconds, limiting the peak current draw. The MicroAir EasyStart 364 is the most popular RV soft-start kit in the US, reducing startup amps by 65 to 75 percent. It installs in 20 to 30 minutes by anyone with basic electrical skills and costs approximately $200 to $250. The Micro-Air EasyStart 709 is designed for larger 15,000 BTU units.
The most widely installed rooftop RV AC brands in the US are Dometic and Coleman-Mach, which together account for the majority of factory-installed units in new RVs. The Dometic Brisk Air II (13,500 BTU) and the Coleman Mach 15 (15,000 BTU) are the two most common replacement units and are available at most RV dealerships and online retailers. Furrion, whose Chill series launched around 2019, has gained significant market share with a more modern aesthetic and competitive pricing. Advent Air units offer similar performance at lower price points. For ducted systems in larger Class A and Class C motorhomes, Dometic Penguin and Coleman Mach ducted systems dominate the market and are well-supported by the dealer network. Parts availability and dealer support are important factors in the US RV market, which favors the established brands for their nationwide service network.
Yes, but it requires a substantial solar and battery system. A 13,500 BTU RV AC running at 1,365 watts for 8 hours consumes approximately 10.9 kilowatt-hours of energy per day. To supply this from lithium batteries alone, you would need at least 20 kWh of usable battery capacity (accounting for inverter efficiency and leaving reserve capacity). To recharge that from solar in a single day requires roughly 3,000 to 5,000 watts of solar panels depending on your location and sun hours. More practically, a 2,000-watt solar array with 10 kWh of lithium batteries can run an AC for 4 to 6 hours on a sunny day in a location with good solar irradiance. A soft-start kit is essential for battery-powered AC use because the startup surge can exceed the inverter’s surge capacity without one.
Measure the interior floor dimensions from inside the RV, not from the manufacturer’s listed length. Exterior length includes the hitch or coupler, bumper overhangs, and other non-living-space dimensions. A trailer listed as 28 feet exterior may have only 22 to 24 feet of interior living space. Measure length and width at the widest interior point. Add slide-out floor area separately: measure the depth and width of each slide-out in its fully extended position. Sum everything for your total interior square footage. For ducted systems that cool separate zones, measure each zone independently and calculate whether a single AC can cool all zones simultaneously or if zonal control is needed.
Continuous AC operation with inadequate cooling usually indicates one of three problems: the unit is undersized for your conditions, the unit is failing, or heat is entering the RV faster than the AC can remove it. The most common causes are undersizing for the climate (especially in desert Southwest conditions), a damaged or dirty AC filter restricting airflow, refrigerant loss in older units, a failing compressor, or heat infiltration through poor door and window seals. Check the AC filter first, a clogged filter reduces airflow and dramatically reduces cooling efficiency. If the filter is clean and the unit is the correct size for your conditions, the next step is having a technician check refrigerant charge and compressor function.
The most impactful strategies for reducing RV cooling load while boondocking are: park in shade whenever available (full shade reduces cooling demand by 8 to 15 percent); use reflective window coverings (Reflectix or similar) on all sun-facing windows; install an EPDM or reflective roof coating to reduce roof heat absorption; use a roof vent fan (Fan-Tastic or MaxxAir) instead of AC when outside temperatures drop below 80 degrees at night; minimize cooking inside the RV during peak heat hours; pre-cool the RV before unplugging from shore power; and run the AC in the early morning to build up thermal mass before the day heats up. Each strategy reduces the BTU load, directly reducing generator run time and fuel consumption.
Yes. Ductless mini-split systems are increasingly popular in RVs, particularly in larger Class A motorhomes and converted van builds where low-profile installation is preferred or the roof structure does not accommodate standard rooftop units. Mini-splits offer significantly better energy efficiency (EER ratings of 15 to 22 versus 9 to 10 for standard rooftop RV units) and quieter operation. The tradeoff is more complex installation, higher initial cost, and the need for an outdoor-mounted compressor unit. In an RV context, the outdoor unit is typically mounted in a storage bay or on a rear bumper rack. Many full-time RVers and van converters consider the efficiency gain worth the installation complexity. Products like the Furrion Chill 15,000 BTU inverter mini-split are purpose-built for RV use and offer plug-and-play installation compared to residential mini-split systems.
Annual service before each camping season is the standard recommendation. Basic service includes: cleaning or replacing the return air filter inside the ceiling assembly (every 2 to 4 weeks during heavy use), cleaning the evaporator coil fins with coil cleaner spray, cleaning the condenser coil on the rooftop unit, inspecting and cleaning the drainage pan and condensate drain, and inspecting all electrical connections and the rooftop gasket seal for leaks. The rooftop gasket should be replaced every 3 to 5 years or whenever inspection reveals cracking or compression failure, as a failed gasket allows water intrusion that causes ceiling and wall delamination in RV construction. For units over 8 to 10 years old, a technician check of refrigerant charge is worthwhile even if the unit appears to be cooling adequately.
Yes. A taller ceiling increases the volume of air that must be cooled, which adds to the total BTU load. This matters most in Class A diesel pushers with ceilings at 7.5 feet and some premium fifth wheels with raised ceiling sections. A 400-square-foot Class A with 7.5-foot ceilings has roughly 3,000 cubic feet of interior air volume, compared to approximately 2,600 cubic feet for the same footprint with 6.5-foot ceilings. This is a 15 percent increase in air volume that translates to additional BTU demand. This calculator applies a ceiling height multiplier that increases the BTU estimate by approximately 1.5 percent for each 0.5-foot increase in ceiling height above the 6.5-foot baseline.
A non-ducted (or direct-discharge) RV AC unit delivers cooled air directly from the ceiling assembly into the space below it. This works well for smaller RVs where the living space is essentially one open area visible from the AC unit. A ducted RV AC connects to a ductwork system that distributes cooled air through ceiling vents to multiple rooms or zones, providing more even temperature distribution throughout a larger RV. Most Class A motorhomes and large fifth wheels use ducted systems. The BTU sizing calculation is the same whether the system is ducted or non-ducted, but with ducted systems the effective cooling reach of a single unit is much larger because conditioned air is distributed throughout the entire floor plan rather than concentrated in one zone.
A properly maintained RV rooftop AC unit typically lasts 10 to 15 years with moderate seasonal use. Full-time RVers or those camping heavily in hot climates may find their units need replacement at 8 to 10 years. Compressor failure is the most common cause of unit replacement, typically preceded by gradual cooling performance decline over one to two seasons. Signs that a unit is approaching end-of-life include: inadequate cooling despite clean filters and proper sizing, compressor that runs but does not cool, visible refrigerant oil staining around fittings, increasing electrical draw without proportional cooling output, and unusual noises during startup or operation. In most cases, full unit replacement is more cost-effective than compressor replacement on a unit over 8 years old, given the labor cost and the likelihood of other components failing soon after.

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Legal Disclaimer and Editorial Transparency

This RV AC sizing calculator uses a 40 BTU per square foot baseline with climate, insulation, sun exposure, and occupancy adjustment factors based on industry-standard RV thermal performance data. Actual BTU requirements vary based on your specific RV construction, wall and ceiling materials, window count and quality, door seal condition, and actual climate conditions. This calculator provides estimates for planning and comparison purposes only.

Power consumption figures are based on published manufacturer specifications for typical units in each BTU class. Actual power draw varies by unit age, ambient conditions, and operating duty cycle. Generator sizing recommendations include a 25 percent headroom factor; actual generator performance depends on altitude, fuel quality, and generator condition. Soft-start kit effectiveness varies by brand and installation quality.

USCalculators.com is not responsible for equipment purchase decisions, improper installation, property damage, or personal injury resulting from use of this calculator. Editorial transparency: No AC manufacturer, generator brand, or soft-start device company paid to influence the recommendations on this page.

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