With a plethora of heating and air conditioning units available out there, it can be tricky to decide on the best one. You might want to look for the SEER rating of the model when making a decision. The higher the SEER rating, the more energy-efficient your heating and air conditioning unit will be. In other words, it'll help you save a ton of money in the long term. Look for the Energy Star logo too. Other temperature-control features you want in your HVAC unit are smart thermostat and zoning.