Why do air conditioners use copper pipes, not aluminum pipes?

The reason why household air conditioners use copper pipes is more path dependence, technical latitude and aluminum alloy flat pipes have their advantages and disadvantages, and they are not absolutely good or bad.
Two household air conditioners (evaporator + condenser) are currently commonly used in copper tube + aluminum alloy fins, which are punched in the aluminum alloy fins and then expanded and fixed. This structure and manufacturing process has been used for many years, and it is very mature, and the industrial chain maturity and market recognition are also very high
The aluminum alloy flat tube + aluminum alloy fin is widely used in automobiles, and the flat tube has a bus tube at both ends. The welding process between the flat tube and the bus tube is difficult, the defect rate is relatively high, and the amortization of defects is more
Structurally speaking, the structure of the car is more compact, small volume; The material cost of aluminum alloy is lower, but the manufacturing cost is higher, and the overall gap is not opened. As for the life, in fact, the life of the air conditioner depends on the cooling fins, the fins are weathered into powder for a long time, and there is no refrigeration effect, and the pipeline is not currently a bottleneck
Has a home air conditioner manufacturer ever thought about using the structure of a car air conditioner? The answer is yes, not only thought about, as far as I know also seriously developed, but the conclusion is that there is no significant advantage in cost, and the entire manufacturing system investment is huge, the upstream industry chain has to be re-developed, the market acceptance is unknown, so it has not entered the commercial development