When you are shopping for a brand new central heating and air conditioning system, the main question a lot of folks ask, including myself, is what is a great HVAC brand to buy? Well, there really is not a good straight answer to this. Because when it comes to central heating and air conditioning system units everyone has different heating and cooling needs as well as different heating and air conditioning preferences. So this really all depends on the size and shape of your home as well as the insulation in your home. The only thing that one can really say is a must is that you always should pick a central heating and air conditioning system with a great SEER rating! If you are not familiar with what a SEER rating is, it is the thing that tells you how energy efficient your central heating and air conditioning system unit is. The higher the SEER rating the better it will be. If you happen to not pay attention to a SEER rating, the central heating and air conditioning system unit you will buy will end up costing you a fortune on energy bills each and every month of the year and you could potentially go broke as a result! So always check the SEER rating and make sure it is a high one with whatever central heating and air conditioning system unit you are looking into purchasing for your home! That is the only advice I can give on what central heating and air conditioning system unit to buy.