Viesa Holiday IIIs is an Italian-made cooler that uses water evaporation to create a natural and immediate feeling of comfort and wellbeing. Essentially, it favours the evaporation of skin moisture to remove excess body heat. This approach differs from that of conventional coolers, which cool the surrounding air and reduce the temperature in the entire ambient space. Holiday IIIs provides natural wellbeing at a contained weight and size, and low power consumption. Aerodynamic, silent, operating at 12 volts with no gas or chemical additives.

Why choose a HOLIDAY IIIs

  • It can also be operated while the vehicle is in motion
  • prevents excessive surges in temperature
  • eco-friendly: no oil or chemical additives
  • low power absorption, 12 volt operation
  • silent operation thanks to an advanced centrifugal pump
  • healthy: purifies air through a system of filters
  • thousands of motorhome enthusiasts confirm its efficiency
  • creates a comfortable environment: it maintains a constant rate of humidity
  • natural: it removes body heat through the principle of evaporation

The Viesa brand is owned by Colven, a global leader in the development of innovative state-of-the-art technologies that guarantees quality, reliability and service.

BENEFITS: Fresh air is 100% filtered • Doors and windows can remain open • It maintains a part of the humidity in the air, which is especially beneficial for allergy conditions or asthma • Reduces fumes, harmful particles and odours • Can be operated while driving • The cooling system efficiency increases as the external temperature rises • Low power consumption, up to 80% more economical than conventional systems • Easy to install, requiring minimum maintenance • Reduces static current • No dry air

The Holiday IIIs is manufactured entirely using “Made in Italy” components (except for the special Colven patented filter, made of a weave of strands of three different types of wood), and assembled at the Montemurlo production site of Ital Colven, a subsidiary of the Colven group from Argentine. The electronic control unit has an LCD display that allows to set all the conditioner’s functions and can be remotely controlled using the provided unit. The system can monitor the battery charge and shuts itself off automatically in the event of low voltage (10.5V), in order to prevent possible damage to the accumulators. Multiple safety protection systems are designed to intervene in the event of a water failure (buzzer signal and pump auto-shutoff), reverse polarity, or operating malfunctions of some components. Twentyfive fan speeds available, with a start/stop programming control timer and a “fan only” function (with the pump disabled). Designed to refresh an environment of no more than 8 linear meters, and with a maximum of 4 people on board, the Holiday III operates at 12 Volt and is installed at the center of the passenger cabin where usually a standard (40 x 40 cm) or midi (50 x 70 cm) porthole is located. It is directly connected to the vehicle’s water system. Filtered, refreshed air is blow through 4 adjustable and independent diffusers that are integrated into the ABS cover fitted onto to the porthole. The cover also features an elegant external frame that can accommodate four integrated spotlights (optional).

Evaporative air coolers work by lowering the perceived temperature, i.e. the heat our body feels. This value is influenced by four different factors: the ambient temperature, relative humidity (i.e. the ratio between the quantity of water vapour contained in a given mass of air, and the maximum quantity of water vapour the mass of air can contain under the same temperature and pressure conditions, measured as a percentage), ventilation, and humidity density. The Viesa evaporative conditioner controls all four of these factors to create a feeling of personal wellbeing, rather than on the surrounding environment. This provides a proper evaporation of humidity on the skin, a phenomenon whose effect is to remove heat. The cooling process starts with the evaporation of water from the filter surfaces, thus lowering the temperature. Cooled air then enters the cabin at an optimal relative humidity of 40–60%, and at a very low density. Stabilizing the internal relative humidity is essential, since if the air is too damp it is harder – or even impossible – to allow perspiration to evaporate. Similarly, humid air introduced at a low density (i.e. with tiny nebulized droplets measuring 0.002 microns) enables moisture to be distributed over a larger surface, facilitating faster evaporation. Evaporation is further promoted by forced ventilation from the cooler.


Current consumption (12 Volts): Min – 1,3 Ah – 15,6 Watt/hour
Max – 5,8 Ah – 69,6 Watt/hour
Water Consumption: 0,5 to 1,5 litres/hour
Weight: 19 kg empty/20,5 kg fully loaded
Size: Height: 21 cm
Length: 83 cm
Width: 75 cm
Airflow: Max 19 cubic meters/minute
Dimensions of internal grille

56x56x8 (H) cm.(40x40cm porthole)

56x84x8 (H) cm.(50x70cm porthole)

Operating temperature: Min 5°C/Max 50°C air temperature
Voltagge: 12 Volt DC
Fan speeds: 24
Filter evaporator composed of three natural fibres.
  • Easy to read LCD display
  • Clock
  • Battery charge level indicator
  • Programmable on-off switch
  • Automatically drying evaporator filter
  • Manual pump shut-down when used for ventilation only
  • Full remote control of all functions
  • Evaporator filter replacement indicator
  • Empty tank indicator
  • Against polarity reversal
  • Against short circuit, high and low consumption of the pumps
  • Against short circuit, high and low consumption of the ventilation
  • Against short circuit, high and low consumption of the solenoid valve.
  • Against low tension of the service battery (battery protection).
  • Against absence of water in the system (cuts the hydraulic circuit off).
  • Against unit forgotten and left on (automatic switching-off after 24 hours).



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