Vending Machines

About two months ago the vending company who has the contract where I work put two machines just down the hall from my office. The only attempt at acoustic treatment in the building is the suspended ceiling, the rest of the surfaces are very reflective. I spend a lot of my days with the office door nearly or fully closed as the compressor on the pop machine sounds like a helicopter turbine starting up and running. Headphones help but that whine is always there. I'll have to record it and check to see what frequencies are involved. On the plus side it does harmonize pretty well with the whine from my laptop's power supply, so it's not all bad.