Local air conditioner PAC 3900 X – 3-in-1 function: air conditioning, ventilation and dehumidification
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  5. PAC 3900 X

Local air conditioner PAC 3900 X

Triple power for extra freshness: cooling, ventilation, dehumidification

With cooling technology of the latest generation as well as a comprehensive functional range the multifunctional air conditioner PAC 3900 X lives up to its reputation as genuine all-rounder. For cooling, ventilation or dehumidification: The ultra-compact air conditioner meets all requirements of an ideal room climate with flying colours. With a cooling capacity of 3.9 kW the air conditioner of the PAC series is especially well suited for large rooms of up to 130 m³. Apart from the reliable cooling on hot days the PAC 3900 X filters and dehumidifies the room air and generates a fresh breeze to top it all off. As desired in three fan stages and with swing function for an optimal distribution of the air in the room.

Functions of the PAC 3900 X

Refreshingly convenient. As flexible as possible.

Energy-saving cooling of room air using the PAC 3900 X

The PAC 3900 X comes equipped with a modern microprocessor control and a variety of individually programmable functions. Optionally, the device regulates the room climate autonomously. The smart air conditioner even automatically reduces the energy costs by switching off compressor and fan when reaching the predefined target temperature.

Saving tip: The operating modes ventilation and dehumidification can also be selected with deactivated cooling function. Therefore, the 3-in-1 air conditioner PAC 3900 X can be used throughout the year to create a healthy, agreeable indoor climate – whilst keeping the power consumption at a minimum. This further reduces the energy demand of the already economical device and renders the purchase of a separate fan or dehumidifier redundant.

The integrated timer function permits operation by the hour as well as automatic switch-on and -off. An agreeably silent night mode with adapted temperature control guarantees a good night's rest and the necessary physical regeneration.

More time for the things that matter! The set operating parameters such as mode, target temperature and fan stage will be saved when switching the device off and then automatically adopted for the next switch-on.

The monobloc air conditioner PAC 3900 X is optionally controlled via the supplied IR remote control or the neatly arranged control panel with membrane keys.

A few practical benefits:

  • Energy efficiency class A
  • 3.9 kW cooling capacity
  • Three operating modes: cooling, ventilation, dehumidification
  • Three fan speeds
  • Timer function
  • Practical LED display
  • Easy-to-clean membrane keypad
  • Room temperature display
  • Swing function for optimum air distribution
  • IR remote control
  • Removable air filter
  • Quiet operation < 53 dB(A)
Air conditioner PAC 3900 X with closed air outlet
Air conditioner PAC 3900 X with open air outlet
Air conditioner PAC 3900 X – perspective view
Air conditioner PAC 3900 X – side view
Air conditioner PAC 3900 X – rear view
A permanent condensate drain can be additionally connected
PAC 3900 X with AirLock 100 window seal

Installation and maintenance of the PAC 3900 X

Ready for use in a breath.

If required, the already preassembled air filter can be removed and cleaned unproblematically. The humidity is collected in a collecting tank in form of condensate. If required, a permanent condensate drain can be connected at the rear of the device.

Tip: To connect the supplied exhaust air hose, use the handy AirLock window or door seal.  It allows window or door feed-through without loss of cool air. The hose can be attached to any type of window (casement, bottom hung or skylight window) or door (swing or bottom hung door). The AirLock increases the cooling efficiency of your air conditioner and reduces the consumption costs.

How high is the required cooling capacity? 
An insufficient or excessive cooling capacity causes unnecessary energy costs. Therefore, it would be best to quickly and easily calculate the required cooling capacity for your living and office spaces. Click here for more information about the calculation ...

The air filters of the PAC 3900 X can easily be accessed and cleaned.
PAC 3900 X – air filters
The on-demand LED display provides all important parameters at a glance, even in the dark.
PAC 3900 X – control panel
Keeping everything in hand with the user-friendly remote control of the PAC 3900 X.
PAC 3900 X – remote control

Mobile, minimum space requirements, low in maintenance

Of manageable size, versatile, intelligent design.

The bedroom today, the living room tomorrow? That is no problem at all. On the low-friction rollers, the device can be easily moved from one location to another at the ergonomically shaped recessed handle. When storing the device at the end of the cooling season, the cable can be easily stored using the practical cable winder.

Upon reaching the preselected target temperature the integrated power saving function automatically switches off compressor and fan.
PAC 3900 X – power saving function
With the cable winder, there is no trip hazard and the cable is not lying around.
PAC 3900 X – cable winder
Ideal air distribution thanks to on-demand swing function.
PAC 3900 X – swing function

One air conditioner – manifold application options

With its three operation modes cooling, ventilation and dehumidification the powerful and flexible all-rounder PAC 3900 X is recommended for use at home or in the office.

Owing to the timer function the PAC 3900 X dissipates accumulated heat from the office just in time for you to start working. To increase motivation and productivity.
PAC 3900 X – timer
The ultra-silent night mode of the PAC 3900 X permits restful, uninterrupted sleep. With reduced noise emission and smart temperature control. To start your day fresh and relaxed.
PAC 3900 X – night mode
Wherever excessive humidity levels become a temporary problem: In addition to the pleasant cooling effect the PAC 3900 X also withdraws excess moisture from the air. For a healthy room climate.
PAC 3900 X – dehumidification and air conditioning

All important features at a glance

Cooling capacity
With its 3.9 kW the air conditioner provides a pleasantly chilled feel-good climate.
Cooling capacity
Dehumidification function
The humidity level in the room can be reduced even without the cooling function.
Dehumidification function
3 fan settings
The room air is circulated even when the cooling function is switched off.
3 fan settings
Automatic mode
Controls the cooling level depending on the ambient and target temperature.
Automatic function
Swing function
Ideal air distribution thanks to on-demand swing function of the fins.
Swing function
Remote control
Control your air conditioner conveniently using the infrared remote control.
Remote control
LED display
The LED display provides information on all important parameters.
LED display
Detection of faults and precise indication of the source of error.
Night mode
Helps you to sleep healthily by way of a slow, constant temperature increase.
Night mode
Timer function
The air conditioner automatically switches on or off after the desired period.
Timer function
Room thermostat
The current room temperature is determined by the integrated thermostat.
Room thermostat
Air filter
Anti-bacterial, washable filter for air quality improvement.
Air filter
Auto restart function
Remembers the previously selected settings for the next switch-on.
Auto restart function
Thanks to the low-friction castors the air conditioner can be positioned as needed.
Climate know-how from Trotec

Monobloc or split? One-hose or two-hose technology?

Don’t get hosed by competitive statements, we provide the big picture. Before purchase make sure to get an overview of device differences, functional principles and possible applications.

Trotec, your climate expert, has compiled the most important facts in a reader-friendly overview! Direct link to the “Practical knowledge concerning air conditioning“ …


Local air conditioner PAC 3900 X show in Trotec online shop

Local air conditioner PAC 3900 X

A comfortable range of functions and cooling technology of the latest generation make the multi-functional air conditioner PAC 3900 X a true all-rounder. With a cooling capacity of 3.9 kW, the air conditioning unit of the PAC series is recommended as a cooling solution for large rooms up to 130 m³.

You save: 154.34 £

517.47 £ 363.13 £ incl. VAT
Show net price (VAT not included)



Technical data
General information
  Article number
Cooling capacity
  Max. cooling capacity [kW] 3.9
  Max. cooling capacity [Btu/h] 13,300
Recommended room size
Amount of air
  Stage Max. [m³/h] 420
  stages 3
Dehumidification performance
  max. [l/h] 0.16
Attainable room temperature (min.)
  depending on operating conditions [°C] 17
Cooling medium
  Cooling medium Air
Surrounding conditions
  Min. temperature range [°C] 17
  Max. temperature range [°C] 35
Electrical values
  Mains connection 220 - 240 V/50 Hz
  Power input [kW] 1.9
  Nominal current consumption [A] 8.6
  Recommended fusing [A] 10
Electric connection
  Connection plug CEE 7/7
  Cable length [m] 1.4
  Type of cooling agent R290
  Amount of cooling agent [g] 280
  GWP factor 3
  CO2 equivalent [t] 0.001
  Suction Side pressure [MPa] 1
  Discharge Side Pressure [MPa] 2.6
Sound values
  Noise emission [dB(A)] according to EN ISO 3745:2012 65 dB(A)
  Stage 1 - Distance 1 m [dB(A)] 52.5
Exhaust air hose
  Total length [m] 1.5
  Diameter [mm] 130
  Length (packaging excluded) [mm] 470
  Width (packaging excluded) [mm] 400
  Height (packaging excluded) [mm] 760
  (packaging excluded) [kg] 35
Equipment, features and functions
Condensate draining
  With condensate drain
Timer function
  Switch-on time preselectable
  Switch-off time preselectable
Room thermostat
Room air filter
  Readily accessible
Additional functions
  Dehumidification function
  Ventilation function
  Automatic function
  Automatic error diagnosis
  Swing function
  Sleep mode
  Energy saving mode
Control panel
  LED display
  Membrane keys
  Microprocessor-controlled operation
  Infrared remote control
  Plastic wheels
  Carry/transport handle(s)

 standard equipment

 optionally available

 not available


AirLock 100 Window Sealing show in Trotec online shop

AirLock 100 Window Sealing

Let the used air of your air conditioning unit out - but doesn't let hot, sticky air in! This extremely practical accessory can be installed in a matter of seconds and keeps insects out and sudden downpours from flooding your room. Ideal for use with the PAC 3500.

You save: 24 %

15.39 £ 11.69 £ incl. VAT
Show net price (VAT not included)


AirLock 1000 Door and Window Sealing show in Trotec online shop

AirLock 1000 Door and Window Sealing

The energy-saving solution for air-conditioning units with standard and dual-hose technology! Leaves the exhaust air of your air conditioning outside - but prevents warm, stuffy air from the outside to come in! It has a circular length of 560 cm and is ideal for terasse doors.

You save: 49 %

44.91 £ 22.66 £ incl. VAT
Show net price (VAT not included)


Alternative products

PAC 3900 X with alternative products:

start comparison
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PAC 3200 E A+ Local Air Conditioner

The air conditioner PAC 3200 E A+ is the energy saver amongst mobile air conditioners, and it convinces with an energy saving of 20% compared with air conditioners in energy class A. Other attractive features of PAC 3200 E A+ are 3.2 kW cooling capacity, three fan speeds, timer and much more...

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PAC 3500 E Local Air Conditioner

The 3 in 1 air conditioner PAC 3500 E with cooling capacity of 3,5 kW: fast cooling, refreshing ventilation, powerful dehumidification!

You save: 163.42 £

481.15 £ 317.73 £ incl. VAT
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PAC 3500 Mobile Local Air Conditioner show in Trotec online shop

PAC 3500 Mobile Local Air Conditioner

The monoblock unit is ideal for use in rooms up to 115m³. An energy class A rating and a cooling performance of 3.5kW add to the low running costs. And here are one or two practical additional features: an IR remote control and a programmable 24-hour timer.

You save: 118.02 £

481.15 £ 363.13 £ incl. VAT
Show net price (VAT not included)


Daily rent:
14.40 € incl. VAT per day


PAC 3500 X Local Air Conditioner show in Trotec online shop

PAC 3500 X Local Air Conditioner

The monoblock device is ideal for usage in rooms up to 115 m³. With a low energy consumption class A and a high cooling capacity of 3.4 kW it convinces with economic efficiency. Functional detail: an IR remote control and a programmable 24 hours timer function.

You save: 163.42 £

481.15 £ 317.73 £ incl. VAT
Show net price (VAT not included)


PAC 3550 PRO Local Air Conditioner show in Trotec online shop

PAC 3550 PRO Local Air Conditioner

Air conditioner PAC 3550 PRO (max. 3,5 kW): up to 25% more efficient cooling thanks to innovative technology. The mobile air conditioner PAC 3550 PRO with its cooling capacity of 3,5 kW lowers the temperature quickly in rooms up to 45 m².

517.47 £ incl. VAT
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PAC 4100 E Local Air Conditioner show in Trotec online shop

PAC 4100 E Local Air Conditioner

In summer, by record temperatures the air conditioner PAC 4100 E runs on top form. The for monoblocks unusual high cooling capacity of 4,1 kW ensures refreshing cooling even at temperatures around 40 degree mark in no time at all.

You save: 90.80 £

590.11 £ 499.31 £ incl. VAT
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Local air conditioner PAC 5800 X show in Trotec online shop

Local air conditioner PAC 5800 X

The mobile 4-in-1 air conditioner PAC 5800 X cools heated rooms to a comfortable temperature in no time at all.

907.87 £ incl. VAT
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