The biggest mistake you can make when you are buying new HVAC equipment is to choose a unit that is not appropriately sized for your space. This is especially true if your old unit was not giving you enough heating or cooling. This might be the cause of you trying for something more powerful this time thinking you might end up with a better condition in your living or working space. But it doesn’t work that way. When we are thinking about HVAC systems which include furnaces, boilers and air conditioning units, it does not mean that big is better. You need a unit which would provide exactly the requirements that you need. Anything more would be a wrong choice and in this article we will be explaining why this is so.