Fantastic Idea , have a friend who had one put into their new house about 18months ago , it really works !!
They also have a big Reverse Cycle split they used in the middle of winter and because a lot of heat was wasted and went into the roof space this unit pumps it back in .
The difference in Summer was also noticeable because with a couple of windows open it keeps drawing in cooler outside air ( mainly at night ) and replacing the hot air inside that normally just sits there.
It's a very passive system that keeps your house at a more stable temp without really doing anything at all.
It's strange that hardly anyone knows about this system , maybe because not like active heating and cooling that has an instant effect when switched on , this thing quietly does it's thing .
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