For a cooling system that’s efficient, quiet, and durable, you might want to consider a ductless mini-split air conditioning system. Here’s why:

1. Efficiency: Ductless mini-split systems are known for their high energy efficiency. They operate on inverter technology, which adjusts the compressor speed based on the cooling needs, resulting in consistent temperature control and lower energy consumption compared to traditional systems.
2. Quiet Operation: Most ductless mini-split systems are designed to operate quietly. Look for models with low noise levels, typically around 21-30 decibels (dB) indoors. This is much quieter than the 71-76 dB range you mentioned.
3. Durability: These systems are built to last. With proper maintenance, including regular cleaning of filters and annual professional inspections, a ductless mini-split system can provide reliable cooling for many years.