When it comes to buying a new HVAC system, pay attention to every detail. Check the SEER rating of the many different units. Find which SEER rating is best for your home. Estimate your monthly utility bills based on the energy efficiency rating. Most important of all, find a professional HVAC contractor. But, how will you find the best HVAC pro? Here are some things that you should look for in a professional HVAC contractor.   Look for Certifications and Licenses HVAC certifications are proof that the contractor is reliable. It shows that they have the needed HVAC training and knowledge. Below are some of the certifications that are most important. NATE Certification NATE stands for North American Technician Excellence. This is the largest HVAC certification agency in the United States. This certification proves that an HVAC contractor goes through training every two years. It shows that they are up to date with the latest HVAC technology. Plus, it shows that they have enough knowledge and skills to install HVAC equipment. ACCA Certification