Air Conditioning repair problems are very common. The less a home owner has there a/c system checked and maintained, the more problems they will have. This speaks true if your system was installed incorrectly by a unqualifiedair conditioning contractor. The proper contractor should be equipped with tools to the job right. You would not believe on how many air conditioning  contractors do not have the correct tools. They just sale you a magic box and install it and do not test it. The air conditioning contractor should be equipped with air balance tools (flow hoods, magnehelic gauge, hygrometer, velocity measuring tool, etc), they also should be performing some type of heat load calculation on your home. Other tools and procedures they should have and do are: micron gauge to evacuate the system properly, gauges to read pressures, clamp on temperature probes, air temperature probes, amp meter, rpm meter, etc.

When you decide to use a contractor it is good to ask them if they have these tools before letting them touch your air conditioning system. When installing your air conditioning system you need to make sure the air conditioning contractor test your system before and after the job so they can prove the system is operating correctly and efficiently. Air balance test and super heat subcool test are the main ones. This is just a little information to arm you with when choosing the right contractor. Go to www.sheltonspride.com to see more use full information.