The Brunner Polarys Imperator is a portable compressor air conditioning unit built specifically for motorhome and campervan use. It's available in three vehicle-specific versions covering the Fiat Ducato (2006 onwards), Ford Transit (2014 onwards) and Mercedes Sprinter (2018 onwards), with each unit designed to fit directly into the original cab window of that particular vehicle. Weighing 20kg and measuring 30.5 x 29 x 67.8cm, it connects to a standard 230V mains hookup and delivers 7,000 BTU (2,050W) of cooling power across a temperature range of 16°C to 30°C. Setup is tool-free, and the exhaust system routes hot air out through a bespoke adapter matched to your vehicle's window profile.
How does the Brunner Polarys Imperator cool a motorhome without permanent installation?
The Brunner Polarys Imperator is a self-contained portable air conditioner that fits into the original cab window of your Ducato, Transit or Sprinter. It requires no permanent fitting, no roof penetration and no specialist installation. The unit sits in the cab window aperture using a vehicle-matched adapter that expels hot air outside while the cooling section works inside the cab. At 7,000 BTU and 790W input power, it's suited to the living space of a small to mid-sized campervan conversion.
The people who tend to go for the Polarys Imperator are self-builders and van converters who want genuine cooling performance without the commitment of a roof-mounted unit. It's also a solid choice for motorhome owners who already have a rooflight or solar array taking up roof space, and for anyone who finds a bench-mount system impractical due to interior layout. Because the design is vehicle-specific rather than a universal fit, the hot air exhaust integrates properly into the window frame of a Ducato from 2006, a Transit from 2014 or a Sprinter from 2018, rather than relying on improvised window seals or hose kits that let warm air back in. It draws 790W at 230V 50Hz, which fits comfortably within a standard 10A or 16A campsite hookup without tripping the supply when used alongside typical low-draw appliances.
Brunner is an Italian brand with a long history in camping and leisure vehicle accessories, and the Polarys Imperator sits alongside their Twinair split-system units in the brand's dedicated air conditioning range. For UK users heading to France, Spain or southern Europe in summer months, this kind of portable cooling makes a real difference when daytime temperatures regularly push above 30°C. The 230V mains requirement does mean it's a hookup-only unit, so it won't operate off battery power, but for campsite touring that's the normal use case. Stock the version that matches your van, check the build year, and you're ready to fit it straight from the box.
The Polarys Imperator is a new powerful portable air conditioning system, specifically engineered for motorhomes and campervans. This innovative unit features a specialised hot air exhaust system, designed for seamless installation on original cabin windows, ensuring maximum efficiency and comfort. Its tool-free setup allows for quick and effortless installation, making it the ideal solution for on-the-go cooling. Enjoy a refreshing environment wherever your travels take you, without the hassle of complicated assemblies. Compact yet robust, this air conditioning system guarantees optimal performance, allowing you to relax in a comfortable climate.
Brunner Polarys Imperator Portable Campervan Air Conditioner Features
- Dimensions : 30,5 x 29 x H67,8 cm
- Weight: 20KG
- Requires: 230V - 50Hz - 790W
- Power: 7000 BTU (2050W)
- Thermal Differential: 16°-30°
Frequently Asked Questions
The Polarys Imperator is available in three vehicle-specific versions: item 0716035N for the Fiat Ducato from 2006 onwards, item 0716036N for the Ford Transit from 2014 onwards, and item 0716037N for the Mercedes Sprinter from 2018 onwards. Each version uses an exhaust adapter matched to the original cab window profile of that specific vehicle, so you need to order the version that corresponds to your van make and build year. The units are not interchangeable between vehicle models.
No. The Polarys Imperator is a portable unit that installs into the original cab window of your vehicle without any drilling, cutting, or permanent fixing. The setup is tool-free. When you don't need it, you remove it and store it. This makes it a practical choice for converters who don't want to commit to a rooftop installation or lose roof space to a permanent unit.
The Polarys Imperator runs on 230V AC at 50Hz, drawing 790W. This means it requires a mains hookup at a campsite or a suitably rated generator to operate. It cannot run from leisure batteries alone without a large inverter, and even then, the continuous 790W draw would deplete most standard battery banks quickly. For campsite touring, a standard 10A or 16A hookup connection handles the unit comfortably alongside typical low-draw appliances.
7,000 BTU equates to approximately 2,050W of cooling output. In practical terms, this is suited to the internal living space of a small to mid-sized campervan or motorhome conversion. The Polarys Imperator operates across a temperature range of 16°C to 30°C, meaning it works to bring the internal temperature down to a set point within that band. In very high ambient temperatures above 30°C, the unit will still cool the space, though it operates at the limits of its rated range. It's not designed for large panel van layouts or high-roof conversions with significant internal volume.
No. The Polarys Imperator is a 230V mains-powered unit and cannot operate while the vehicle is moving under normal circumstances. It installs into the cab window, which also means the window is occupied while the unit is in place. The unit is designed for use when stationary on a campsite with mains hookup. If you need cooling while driving or off-grid, a 12V DC air conditioning system would be a more appropriate solution.
The Polarys Imperator uses a vehicle-specific exhaust adapter that fits into the original cab window aperture of your Ducato, Transit or Sprinter. The hot air produced by the cooling process is routed out through this adapter to the outside of the vehicle, while cooled air is distributed inside the cab and living space. Because the adapter is matched to each vehicle's specific window profile, it creates a proper seal rather than relying on improvised hose kits or universal window plates that allow warm air to re-enter.
The Brunner Polarys Imperator measures 30.5cm x 29cm x 67.8cm (height) and weighs 20kg. At that weight it's not a unit you'll move in and out casually every day, but it's manageable as a semi-permanent seasonal installation during touring periods. The footprint is compact enough to sit within the cab window area without significantly obstructing the cab layout.
Roof-mounted air conditioning units require cutting a hole in the roof of the vehicle, add significant weight at roof level, and take up space that many converters reserve for solar panels, roof vents or skylights. The Polarys Imperator avoids all of those trade-offs. It installs in the cab window without permanent modification, leaves the roof entirely free, and can be removed when not needed. It's a logical solution for converters who have already committed roof space to solar or who don't want the weight and permanence of a rooftop unit.
Yes. The Ducato version (item 0716035N) is compatible with Fiat Ducato vehicles from 2006 onwards. The Ducato is the most widely used motorhome base in Europe, forming the basis of around two-thirds of European motorhomes, so this compatibility covers a very large proportion of the UK motorhome market. It's also worth noting that the Peugeot Boxer and Citroën Relay share a platform with the Ducato, but Brunner has not confirmed compatibility with those variants, so customers with Boxer or Relay-based vehicles should check with us before ordering.
The Polarys Imperator is a vehicle-specific portable unit that installs into the cab window of a Ducato, Transit or Sprinter. The Polarys Twinair is a split-system air conditioner consisting of a condenser unit mounted outside the vehicle and an evaporator unit inside, connected through a window with flexible hoses. The Twinair is more of a universal fit and works across a wider range of vehicles, while the Imperator is engineered for a precise fit to its three supported models. The Twinair is also available in two cooling capacities (3,000 BTU and 5,000 BTU), whereas the Imperator delivers 7,000 BTU, giving it more cooling output overall.
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