Second Opinion Calls
Just explain your situation and see what happens. I personally have done this and sometimes I was able to save the customer a unnecessary repair,other times the previous company were correct with diagnosis.
This blog is to help home owners with simple and useful tips on how to prolong the life of your heating and air conditioner plus ways to save money while using your system.
The last suggestion I have is to find a good reputable service company and get your system checked on a regular basis. This will help keep your system efficient and prolong its life.
I recommend this ebook for more information like this http://www.heatingairtips.com