Even though it started as tag based and written in C++ back in 1995, it was released with a full rewrite in Java back in 2002 (Before Scala was even officially released) and has matured to a modern scripting language featuring Java interop, closures, dynamic typing, and OO patterns.
1 A proper home air duct cleaning costs anywhere from $400-$1,000, depending on the size of the system to be cleaned, the type of services offered, the regional climate and the level of use the ventilation system gets, the type of materials inside the ductwork and the amount of contaminants (dust, mold, etc.).hat should be included: Additional costs: 1  Cleaning should include: cleaning all of registers, inside the ductwork, the interior of the heating/ventilating system, the furnace fan, and the coils for an air conditioner or heat pump, according to Real-Estate-Agents.com.
Central air system costs. Central air systems cost between $6,000 and $10,000 to install in homes already fitted with a forced air heating system with ductwork in place, according to CNN Money. Adding ductwork will increase estimated costs by $2,500 to $4,000.