For whatever reason you are in the market for a new HVAC system, the process can be intimidating. There are thousands of different models on the market with almost 100 different brands. That alone can be overwhelming. Not to mention the range of high energy efficiency to budget-friendly systems, as well as full-featured models. Making an informed decision concerning downflow, upflow and horizontal models without a contractor would require a lot of research. More importantly, an HVAC system is a big-ticket item. You will most likely spend thousands of dollars to have it installed and running properly. Be smart and have a qualified HVAC professional on your team.