Heating mode would be the only mode this could work. it would be more efficient if the collector were after the condenser coil. The coils at low temp can already absorb heat from the air some what efficiently. The solar could then still add more before the metering device. What their site claims is using it for cooling. But they don't state any efficiency ratings. They don't say it but I think they are using the solar heat as a compressor, heating the refrigerant and there by raising the pressures. Works if you're using ammonia or propane refrigerator technology. Im pretty sure you can't use ammonia in residential a/c.
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