Adappted: IMO these attic to lounge systems are a total scam racket. I should know as I got taken by one.. They are so intensely scammish I will not say the name as their goons might come after me. We can't use ours anymore as neighbors burn fires and our house was filling up with smoke from outside! Their suggestion? Get a system that fills your air with plasma gas to counter the smoke. In the end we caved and got a Fujitsu heat pump. The thing is awesome, cools and heats the entire house AND it dries the entire house with it's "dry" function. I no longer rage over getting scammed, now I just consider it a life lesson.
To be fair you can't really blame them for your neighbours having fires and your roof cavity filling with smoke. A few of the houses in my area have fires, I can smell it outside, but I can never smell it inside. I guess my roof cavity just doesn't get it, by good luck.
The roof cavity systems are really good for bringing warm air into the house on sunny days, even in winter it increases the house temp by 2-3 degrees on sunny days, and drives out dampness. Even my little cheap one does the job ok, even if it is too loud to leave on at night.