Just like any other kinds of machines, your HVAC system might require replacing after a while of keeping your air fresh and cool. While not all problems require replacement, there comes a time when you have no choice but to switch to a different HVAC model and make. Simple problems such as clogged air filters and broken fans are fairly easy to correct. However, when things get out of hand, you will have no choice but to invest in a new unit. This article provides information on some of the tell tale signs that you need to either repair or replace your HVAC system.