Heatmax's fan coil, which is the indoor unit of an air conditioning system, transfers heat or cooling to the space by supplying it with water at the appropriate temperature. In Greek, it is referred to as a forced air convection body.

Its operation is based on the forced circulation of air created by the fan it contains. With the help of the fan, heat is distributed throughout the space, in contrast to simple radiator units where heat distribution occurs naturally.

It can be connected to a heat pump or boiler to provide heating and cooling all year round. The unit is installed on the ceiling, either embedded in a false ceiling or freely, depending on the needs of the space.

The air exhaust is only from the point of installation of the unit, distinguishing it from ducted air conditioning systems that can offer multiple air outlet points.