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The benefits of inverter air conditioning are lower running costs and a more even temperature. This is due to the nature of variable speed compressors achieving a far closer differential band. The DC Inverter can operate down to –15 degrees C in heating mode and up to 50 degrees C in cooling mode. Those systems are coming pre charged with refrigerant for 5 meters of pipe work, this has been pre charged with R410a refrigerant. The internal unit can be above or below the external unit to the full 5m-pipe work. However the pipe length can be extended to 15-20 meters and inline pump can be use for anti-gravitational install.