Sedna Aire and their knockoffs are a bogus add-on device. The solar collector acts as the opposite of a desuperheater(sort of like running steam through a desuperheater). They have a habit of making your heat pump explode on a hot, sunny day in mid-summer. Not a bad idea for a heating-only unit, but definitely no good in cooling mode.
Either way, an evacuated tube collector would perform much better. The Sedna units' glass tubes are filled with soybean oil "buffer liquid". They claim the oil retains heat collected while the heat pump isn't running...
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