Then once all the air registers are cleaned, we use an air snake to clean the main trunk lines.  For this we use and "air snake" or "air whip"  which has a reverse air nozzle on it.  We drill a small 1" hole by the furnace and insert the air snake.  The air snake propells itself down to the end of the trunk line and the while the air pressure is still on we slowly pull the air snake back towards the furnace where we have the vacuum hooked up.  The air snake bangs around inside the trunk line very violently and forces all the dust and debris into the vacuum.  

Once the entire air duct system is cleaned we clean the furnace.  Starting with your evaporator coils located just above the furnace.  The evaporator coils get dirty and reduce the efficiency of your air conditioner unit so by having them cleaned you save money on your electricity bills.

Then we clean all the heating elements getting rid of the gas scale build up.  This will help prevent the furnace from getting clogged up and increase efficiency and save money on gas bills and extend the life of the furnace.

Finally we clean the blower and fan compartment getting all the dust and debris off the fan blades.  This helps prevent the blower motor from burning because this is very common if you never clean your furnace and air ducts.

We charge a reasonable price of just $169.95 for the entire furnace air duct system including the furnace and all of it's components which usually takes about 1.5 hours with a two person crew.  It is recommended about once every 2 years because again, you save money on gas and electric bills, extend the life of the furnace and gives you cleaner air in the house which helps prevent allergies, asthma, common colds and other illnesses.