If you notice any of the above, it's wise to have a local HVAC technician inspect your system. They can pinpoint problems and recommend whether repair or full HVAC replacement is the best course of action.(Image: https://live.staticflickr.com/2826/9130027255_1afb29a6e3_b.jpg) Not all states will require local HVAC technicians to be licensed and insured. In Florida, in particular, service providers do require an up-to-date license.external frame Review Florida’s complete list of HVAC policies and regulations for more information.