Dual A/C Noise insulation options, driving me insane
This is a tough one. We have (2) 12-year old A/C units (3.5/3ton) side by side and are bound tightly on three sides by (2) cinder block walls (1) side of the house. That wall of the house is the wall of our guest room. With even one unit running, the wall vibrates and the volume is unbearable. I understand the age of the units doesn't help, but I'd like to know if this idea would be helpful. House is stucco over frame, 2x4 construction, drywall over batted insulation.
- Remove baseboards on interior east wall (shared with A/C units)
- Green glue the wall
- Attach Suppress or Quietrock 5/8" drywall
- Refinish wall
I've been learning about STC values, but am not versed enough to know how much reduction we'd see. This site under section 5 appears to show little reduction with additional standard drywall. http://www.stcratings.com/assemblies.html