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Ken... The problem is my kitchen, dining, and family room back share a common wall with my neighbor's unit. Her air conditioner is within inches of that common wall. The building's concrete foundation happens to be very thin because the contractor cut corners wherever he could (and was sued by angry homeowners when the complex was new, about 20 years ago for that and several other construction problems that somehow passed inspection. After our big 1/17/94 Northridge earthquake, my neighbor replaced her old air conditioner with a new one, and that is the puppy that's causing the vibrations. It's a good unit... but is sitting on the thin shell which is our concrete foundation and it's that foundation being too thin which is causing the vibrations to be felt in my unit. It's just too flimsy to remain motionless when the air conditioners are on, so it vibrates... The air conditioning specialists whom I spoke with all said that without doing costly major work (IF the condo association would let us make changes to the building's foundation) on the foundation of our two units. I'm not about to even MENTION this to Maria, my neighbor, as this is not like making a inexpensive minor repair! I feel this is just something I must live with as long as I live where I do, however aggravating and physically uncomfortable it is. However, I've been looking into moving down the coast towards the San Diego area where my eldest daughter lives. That would sure take care of the problem!! Barb Mallut [log in to unmask] Ken Becker said: "Barb, maybe you could put some carpeting with a padding under it where you hang out the most, so the vibrations from the A/C unit would not reach your chair? Actually, if they wanted to they have three options to reduce the vibrations from the unit, they could use a device which modifies the power fed to the compressor motor, I believe it is called a power factor controller, which is mostly designed to reduce power used by a motor. I have seen it demoed in Home Depot stores and you can feel how much smoother the motor runs, and they show a meter that proves it cuts the amount of power used. They could probably change or beef up the compressor motor mounting, to stop the vibration from going through the floor. OR they could just replace the whole unit with a new one. YOu will say why would they spend that kind of money, right? Well my folks replaced a working 14 year old a/c unit and cut their electric bill to less than one third! from $268 to $80!!! Plus the electric company gave a rebate of several hundred dollars towards the cost of the new unit. This saves them money by not having to built new or bigger power plants. I don't know if that is done by other power companies? "