Is your HVAC system not producing cool air?
If you are having a problem with your heating and cooling system producing the cool air you need then just contact an air conditioning contractor. All you need to do is call or email one of your local HVAC companies and they will send one of their AC repair and heat pump contractors to your house. Once they are there they will inspect your entire heating and air system to see what problems you have. Be prepared to have more problems than you originally anticipated on though. More times than not they find other issues inside of your HVAC unit.
The best way to prevent this from happening is to set up a routine maintenance call with a local company. When you do this the company you sign up with will send one of their employees to your home or business on a routine basis. This allows the contractor to find the potential problems before they exist saving you numerous amounts of money.