I would like to replace the heating and cooling system in my home. The furnace is over eighteen years old and the air conditioner is even older. They were both already in place when I purchased the home. They had not been properly cared for. Although I’ve been very conscientious about professional maintenance and air filter changes, the heating and cooling units are starting to fail. They have lasted far longer than expected and probably should have been replaced years ago. The furnace tends to make quite a bit of noise when it operates. It spews dust into the air, dries out the indoor environment and only achieved an 80% AFUE rating when it was brand new. It is a single stage model, meaning that it can only operate at a single speed. Because of this, the furnace creates unpleasant temperature fluctuations throughout the day. The air conditioner makes the house smell musty whenever it runs. It is definitely a threat to air quality. The air conditioner no longer puts out sufficient cool air to keep up on especially hot and humid days. Despite running just about non stop, the house often feels overheated and sticky. My monthly electric bills are always very high. I’ve been looking into the different models of modern furnaces and air conditioners on the market. The efficiency levels are very impressive. I would certainly save money on my monthly bills. However, these technologically advanced heating and cooling options are rather expensive. Replacing both the furnace and air conditioner is going to cost me a fortune. Plus, I should really invest in a thorough duct sealing before installing new heating and cooling equipment.