Some wine cellar cooling units are easier to install than others. A ducted cooling system, for example, is an all-in-one unit that can be installed anywhere, including above or below the cellar. You run a duct to the unit, which is fairly straightforward. Handy homeowners and savvy DIYers are often able to install these systems without professional help. A split wine cellar cooling unit, on the other hand, is a bit more complicated. The cooling unit is broken into two pieces: an interior evaporator and an exterior condenser, which are connected by pressurized lines. A professional installer typically needs to set these systems up, since the refrigerant line must be cut and then charged. You may be able to install the interior and exterior components of a split cellar cooling system on your own and then hire a professional to set up the refrigerant line. But things get more complicated if the units are placed on interior walls, since this will require piping through the drywall to the exterior of the building. Bottom line: It’s best to have a professional HVAC company install a split system cooling unit.