Energy Efficient HVAC System a Must in Green Building

One of the key factors within a green or energy efficient home is reduction in natural resources. Many think about the products in the home but never consider the wasted resources in their heating and air conditioning unit. Many will look at the type of system such as natural gas or ground source but never think about the installation. Most rely on the contractor or sub contractor to take care of this. But even the most efficient system can waste energy if not installed properly. So find a HVAC contractor that understands energy efficiency.

Many contractors install the HVAC unit in the attic to reduce taking up space in the home. But think about how cold the attic is in the winter and how hot is will be in the summer. Pulling air from the most extreme difference takes more energy to change to the desired temperature. Cooling hot air or heating cold air does not make a lot of sense.

Now think about the duct work. If cold air is being pushed through a hot duct, it will not stay as cool by the time it reaches the home. When you have a garden hose laying on hot pavement and the water is running, the water will warm up several degrees before it comes out the end. Also how hot is the standing water when you first turn on the hose? This is very similar to a duct system in the attic. When the AC unit turns on it forces the extreme hot air into the home before it cools down and it continually has to work harder to catch back up with the most extreme heat working against it. The reverse is the same in the winter.

For better energy savings and efficiency, the duct work should be installed in an insulated area inside the home. The system should be installed and insulated in the floors or dropped down in a framed chase. Also make sure the ducts are sealed tight. Insulated square or round duct work and taped joints should be used. If the ducts are losing air through leak a in the joints, it is wasted conditioned air. Many homes have flashing nailed over the bottom of the floor joist, making the joist create the duct. This is a very poor installation.

Ask your HVAC contractor to explain how the installation is going to be completed and make sure your system can pass the Energy Star ratings. Educate yourself on the most energy efficient systems before you sign a contract for the work. This will help to assure you are getting the most energy efficient system.