Air conditioners (ACs) are straightforward machines that serve one function—to keep you cool and comfortable. However, the inner workings of these machines is something not most people are familiar with. Of course, you can’t expect everyone to be AC expert, which is why Denver HVAC technicians are called in to do the job. How do you tell what the problem is before you call in an expert to fix it? An eHow.com article by Chris Weis gives us a short run-through of the most common symptoms of low refrigerant problems with your AC.