>Which also suggests there are bigger reasons not to use such pumps in AC. As any Japanese manufacturer will know of such pumps. Yup! This reminds me of a simi

>Which also suggests there are bigger reasons not to use such pumps in AC. As any Japanese manufacturer will know of such pumps. Yup! This reminds me of a similar pitch from a few years ago. When a Kickstarter went live for a small, quiet window air unit called Noria, people signed up in droves, thinking a startup in Philadelphia had somehow solved a physics problem that Johnson Controls and the companies it's sucked up over the years somehow whiffed on. This new device would chill the whole room, it would be quiet, compact, and most importantly, it wouldn't be heavy. It would easily slot into your window, and store under your bed in the cooler months when you don't need it. They raised nearly $1.5M USD in 2016, and in the last year finally started to deliver window units that were ... big, heavy, and noisy. The physics of heat exchangers are very well established. It's wise to take any wild claims of higher efficiency with a massive grain of salt - someone missed something in their equations and it's going to come out during manufacturing.