"HVAC units are quite complex in nature and need expert hands for their handling. Whether it is an HVAC installation or repair it is important to choose the right kind of HVAC contractor for the job. This is because chances are high that for your HVAC unit you end up making a wrong choice. There are a few things that need to be kept in mind while choosing an HVAC contractor.First of all you need to shortlist a few HVAC contractors based on the review of your friends and family. These reviews are of great help as they come directly from people who have personally dealt with the HVAC companies.It is recommended that an HVAC contractor who gives estimation over the phone need to be avoided. This is because it is not possible to give you a quote over the phone as both installation and repair of HVAC units involve quite a lot of calculation.While choosing HVAC contractor one should never forget to check the license of the HVAC contractor. Along with the license even papers claiming the insurance and bond should also be looked upon. Besides you should also find out whether the contractor has the experience to deal with your system.Lastly, one should be wary of HVAC contractors who give you the lowest quote because that will prove costly in the long run. The estimate given should be a standard one neither too high nor too low."