Prevent those uncomfortable situations by servicing your heating and air conditioning units. Much like your automobile, your heating and cooling system needs routine maintenance. Not every three thousand miles, but a check on your system before the cooling season (usually in Apr/May) and then again before the heating season (usually Sept/Oct), will do wonders for the life and efficiency of your system. With just these two system checkups per year most common problems can be avoided. In addition, with a preventative maintenance agreement you receive priority service should your system go down and 10% off on any necessary repair parts.