Shortly thereafter, the first private home to have air conditioning was built in Minneapolis in 1914, owned by Charles Gates. Realizing that air conditioning would one day be a standard feature of private homes, particularly in regions with warmer climate, David St. Pierre DuBose (1898-1994) designed a network of ductwork and vents for his home Meadowmont, all disguised behind intricate and attractive Georgian-style open moldings.[when?] This building is believed to be one of the first private homes in the United States equipped for central air conditioning.
The 2nd-century Chinese mechanical engineer and inventor Ding Huan of the Han Dynasty invented a rotary fan for air conditioning, with seven wheels 3 m (10 ft) in diameter and manually powered by prisoners of the time.In 747, Emperor Xuanzong (r. 712–762) of the Tang Dynasty (618–907) had the Cool Hall (Liang Tian) built in the imperial palace, which the Tang Yulin describes as having water-powered fan wheels for air conditioning as well as rising jet streams of water from fountains. During the subsequent Song Dynasty (960–1279), written sources mentioned the air conditioning rotary fan as even more widely used.
SpectraCool™ NARROW air conditioners feature a dust-resistant condenser coil, supporting filterless operation in most envronments. The range offers a broad range of cooling capacities, from 1110 to 2900 Watts (50Hz), and ara available for operation on 230V and 115V single phase, as well as 400/460V 3-phase power input.
Fan heaters have a small and compact design, they heat up dynamically and are very quiet in operation. The internal warm air is equally distributed throughout the control cabinet. Further advantage of fan heaters compared to PTC heaters is the much lower starting current. PTC heaters are compact in size, have a wide voltage range and the heating power adjusts in relation to the ambient temperature, resulting in better efficiency.