Symphony air cooler is light weight and we can run it on inverter, I bought symphony jumbo air cooler in 2014, it is workung still in good condition , it consumes less power , fibre fan wheel, it cools the room environment very fast, I think it is enough for summer instead of AC, with in 15 minutes it cools the whole room, it is one of the good product available in market for reasonable prices, it is portable for small rooms also, I was very much pleased with symphony jumbo air cooler I am using.