A mini split is a two-part cooling system that mounts inside your camper without needing ductwork

A mini split (also called a ductless heat pump) has an indoor unit mounted on your camper wall and an outdoor compressor unit that sits outside or on your roof. Refrigerant lines connect them through a small hole you drill through the wall. Cold air blows directly from the indoor unit into your living space, and hot air is pushed out through the outdoor unit. Unlike a traditional RV air conditioner that pulls power constantly, a mini split runs only when your camper temperature drifts from the setting you choose.

The main reason truck camper owners choose mini splits is space. A roof-mounted RV air conditioner takes up room inside the camper and adds weight on top. A mini split's indoor unit is thin and mounts high on a wall, leaving your floor and storage untouched. The system also runs quieter than a standard RV unit and uses less power from your battery or generator, which matters when you are boondocking or running off solar panels.

Key Takeaways

  • Mini splits have an indoor wall unit and outdoor compressor connected by refrigerant lines, so they cool without taking up interior space.
  • Installation requires drilling a hole through your camper wall, running electrical wiring, and mounting both units — a job most owners hire out to an RV technician or HVAC installer.
  • Mini splits draw less power than roof air conditioners and run only when needed, making them practical for solar-powered or battery-dependent setups.
  • The outdoor compressor adds weight to your truck and roof, so you need to check your vehicle's payload capacity before purchasing.
  • Mini split systems cost between $2,000 and $5,000 installed, depending on the brand, cooling capacity, and your location.

How the cooling cycle works inside a mini split

The indoor unit pulls warm air from your camper across cold refrigerant coils. As the air passes over those coils, moisture condenses out (which is why you see a drain line running from the indoor unit). The now-cold air blows back into your camper. At the same time, the refrigerant carries that heat to the outdoor compressor unit, where it is released into the outside air and the cycle repeats.

Because the system only runs when your camper is warmer than your set temperature, it cycles on and off rather than running constantly like a roof unit. This cycling is what saves power. A roof air conditioner runs at full strength whenever you turn it on; a mini split ramps up or down based on how much cooling you actually need in that moment.

Electrical requirements and power draw

A mini split needs a dedicated 240-volt circuit run from your camper's main electrical panel to the outdoor compressor. If your truck camper has a generator, it must be able to handle the startup surge — most mini splits draw 15 to 25 amps when they first turn on, then settle to 8 to 12 amps during normal operation. A 5,000-watt generator can usually run a mini split, but a 3,000-watt generator may struggle.

If you are running off batteries and solar panels, a mini split is more forgiving than a roof unit because it does not run continuously. On a hot day, it might cycle for 30 seconds, then rest for two minutes. A roof unit would run the entire time, draining your battery much faster. Still, you should have at least 400 amp-hours of lithium battery (or 600 amp-hours of lead-acid) to run a mini split for several hours without the sun recharging you.

Installation: what to expect and who does the work

Installation is not a weekend DIY project for most owners. The work involves drilling a hole through your camper wall, running refrigerant lines and electrical wiring, mounting the indoor unit securely, mounting the outdoor unit on your roof or exterior wall, and charging the system with refrigerant. Any mistake — a pinhole leak in the refrigerant line, improper electrical connection, or poor mounting — can damage the unit or create a safety hazard.

Most owners hire an RV technician or a mobile HVAC installer who comes to your location. Some RV dealers offer installation as part of the purchase. Labor typically runs $1,000 to $2,000 depending on how much wiring and structural work your specific camper needs. If your camper has aluminum walls, the installer may need to reinforce the area where the outdoor unit mounts to prevent vibration and damage.

Weight and roof load capacity

The outdoor compressor unit weighs 80 to 120 pounds, and the roof-mounted version adds that weight directly to your truck's roof. Before you buy, check your truck's payload capacity — the maximum weight your suspension can safely carry. This number is on a sticker inside your driver's side door jamb. Subtract the weight of your camper shell, any gear you carry, and yourself from that number. If the mini split's weight exceeds what is left, you risk overloading your truck.

Some owners mount the compressor on the side of the camper instead of the roof to spread the load, but this takes up exterior space and may affect how the camper sits on the truck bed. A roof mount is more common, but it does mean your truck will sit lower and handle differently once the system is installed.

Comparing mini splits to other truck camper cooling options

A traditional roof air conditioner is heavier (often 100 to 150 pounds), takes up interior headroom, and draws more power. It cools faster in extreme heat because it runs at full capacity constantly. A mini split is lighter, quieter, and more efficient, but it cools more slowly and requires more installation work. A portable window unit or through-wall unit is cheaper and easier to install but is loud and blocks a window or wall space. Passive cooling — roof vents, awnings, and shade — costs nothing but does not work in extreme heat.

For boondocking or extended off-grid camping, a mini split usually makes the most sense because the power savings add up over days or weeks. For short trips where you have shore power or a large generator, a roof unit may be simpler. For occasional use or tight budgets, passive cooling or a portable unit might be enough.

Maintenance and long-term costs

Mini splits need less maintenance than roof units because they have no exposed ducts or filters clogged by dust and pollen. You should clean the indoor unit's filter every month during cooling season and have the system inspected by a technician once a year. The outdoor compressor should be kept clear of debris and snow.

Refrigerant does not run out under normal use — if your system stops cooling, it usually means a leak, which requires a technician to find and repair. Repair costs vary widely depending on where the leak is and what parts need replacement. A small leak repair might cost $300 to $600; a compressor replacement can run $1,500 to $2,500. Most mini split units last 10 to 15 years if maintained.

Frequently Asked Questions

Can I install a mini split myself if I have electrical experience?

Refrigerant handling requires EPA certification in most states, and improper installation can void the warranty. Even if you wire it correctly, a small leak in the refrigerant lines will ruin the unit. Hire a licensed technician for the full job, though you can save money by doing prep work like running conduit for wiring.

Will a mini split work if I boondock without solar or a generator?

Yes, but only if you have enough battery capacity. A mini split draws 8 to 12 amps during normal operation, so a 400 amp-hour lithium battery can run it for roughly 30 hours before depleting. Once your battery is low, you would need to run a generator or wait for daylight to recharge with solar panels.

What size mini split do I need for my truck camper?

Most truck campers need 12,000 to 18,000 BTU (British Thermal Units) of cooling capacity. A technician can calculate the right size based on your camper's insulation, window area, and how much sun exposure it gets. Undersizing leaves you hot; oversizing wastes money and power.

Does a mini split heat as well as cool?

Yes — mini splits are heat pumps, so they can reverse the refrigerant flow to pull heat from outside air and push it into your camper. They work down to about 20°F outside temperature, though efficiency drops in very cold weather. Below that, you would need a backup heater.

How much does a mini split system cost installed?

The unit itself runs $1,500 to $3,000 depending on brand and capacity. Installation labor adds $1,000 to $2,000. Total installed cost is typically $2,500 to $5,000. Prices vary by region and whether your camper needs structural reinforcement or extensive wiring.