The decibel (dB) scale is exponential, so in technical terms you should expect a 65% reduction in noise. In layman's terms, you should expect a 30% to 50% reduction in the perceived noise. This won't turn your air conditioner into a purring kitten, but it will take the edge of most of the noise, especially during startup of the compressor. A sound blanket is a cost-effective solution compared to moving or replacing your air conditioner.