My boss seems to think this is normal but sitting in my corner office and being clesest to the unit is driving me nuts!

Our lease agreement is a little vague and we have agreed to do most of the maintenance ourselves. This being said, what is a possible cause for this 'normal' problem? What can we tell the tech and/or landlord?

It runs for 27 seconds and stops for 27 seconds. The office does cool down but I suspect the outside air being colder (15-20 deg C) is the reason the office cools down.

Please help an employee who's about to loose it!!!