AC units are our favorite appliance during record-breaking high temps. But when they are on the fritz, life can be miserable! An HVAC system (for heating, ventilating, and air conditioning) is what keeps a home cool in the summer and warm during the winter. You can also justt add AC.But not all AC units are built the same, and there are several different types. So, let’s dive in and see which one is right for you.