If you're installing central air, you need to consider three things: the quality of the equipment that you buy, the output and efficiency of that equipment, and the experience of the contractor installing it. 

A heat pump is essentially an air conditioner that can both heat and cool a house. A simple explanation of how this works is that a heat pump can extract heat found in the air outside your home and transfer that heat into your house instead. 

All furnaces are equipped with an air filtration system designed to trap dirt, dust and other pollutants. Maintaining a clean furnace filter not only helps keep your furnace's interior components clean and in good operating order, but also contributes to improved air quality by reducing the amount of allergens and harmful particles in the air