This is a Dyson cool and hot air exchanger. Answer as the bike my wife that has passed away wanted this too for Xmas, but never even turned it on it took it out it's package to wrap it up for Xmas, never even turn on. I paid $850.00 plus tax, so I don't want it so it's also for sale, price $500.00 if you don't believe me on there cost, check it out for yourself.