Back BooksAmazonIoT/AI Control of VRF Distributed Building Air-ConditionersR 3 935.00Amazon ยท checked 18 days ago View at Amazon AverageR 3 935.00Lowest seenR 3 935.00Highest seenR 3 935.00Last changeR 0.00First indexed25 Oct 2026RetailerAmazonPrice history