The vast majority of the people that are living on this planet are not lucky enough to enjoy a natural climate that is more or less conducive to human life and comfort at this current point in time. As a result of the fact that this is the case, these people generally need to use HVACs in order to get to a point where the internal temperatures of their home would be a great deal more comfortable without a shadow of a doubt.
Sometimes your HVAC is not going to work though, and if you want to keep your air repair service in optimal condition you would need to hire someone really high end in order to come and fix it. A lot of repair personnel are going to work on the repairs within the confines of your own home, but there is no reason for you to avoid an even higher class service that they might provide which would involve them taking the unit to their own shop where they would look at it a little more closely and fix things that would not have otherwise been found.
This level of service is obviously going to cost a bit more, but if you ask us it is worth it. This is especially true if your HVAC has not been cooling at all lately. Some cooling means that the HVAC is working relatively well, but a complete lack of it would be a really bad sign and investing some money into in depth repair can be rather necessary if you want to avoid the HVAC burning out completely thereby making it impossible to be comfortable within the home that you are living inside of.