The Fan coil is available in 2 and 4 pipe versions. The 2-tube fan coil has 1 heat exchanger, while the 4-tube unit has 2 heat exchangers. Cold or hot water can be lead into the heat exchanger with the 2-pipe system. The 4-pipe Fan Coil has a separate heat exchanger for cold and hot water. If several Fan Coil units are installed in a apartment, office, hotel, then with 2-pipe units, we can only heat or cool everywhere at the same time. When installing a 4-pipe system, you can decide in each room whether to heat or cool. When it comes to installing, the 2-pipe system is significantly more cost-effective, but compromises need to be made. Installing the 4-pipe Fan Coil system will make our wallet lighter, but it will perfectly meet our needs in terms of comfort. The system automatically cools or heats by applying the appropriate control thermostat.