If your home does not have adequate home heating ducts, or you are planning to build an addition, you can install new heating ducts safely. It does require some planning, and time, but it can be done. You can pay someone to come in and do it, but while it does require a lot of time, the process of installing new home heating ducts is pretty straightforward.
A home without adequate heating ducts is working too hard to keep the rooms up to temperature. If there is a room without any heating vents, then it will be much cooler than other rooms. Unless the room is blocked off it will bring colder air into the rooms that do have heating ducts causing the home heating system to work more. Installing ducts will help your home be more energy efficient.
Determine the location and size of the heating ducts you are going to need to install. Find out the square footage of each room, or addition. This is done easily by multiplying the width of the room by the length of the room. For instance, if you have 10' x 20' room, you are going to have 200 sq. ft.
Once you have the square footage you will then know the cubic feet per minute (CFM). 1 square foot is equal to 1 cubic feet per minute. This is the rating of the heating duct sizes.
Buy your duct work according to your room needs. Home heating duct will come in a variety of diameters, but are usually in lengths of 25 feet. You will choose the diameter of the duct by the CFM of the room. Each diameter corresponds to a specific CFM. For example, the above room would need an 8 inch heating duct.
Once you know how much you need, you will then assemble the duct work according to the length you will need. You will have to cut down some pieces to make them fit. Use a pair scissors, or tin snips, to carefully cut the duct work. Wear leather gloves, and long sleeves for this operation as the aluminum can be very sharp.
Fold back the insulation of each piece and place a metal sleeve in between two pieces to join them. Butt each duct up to the metal sleeve as far at it will go. Use the duct tape to tape the seams and apply two duct clamps for additional support. Roll the duct tape over the seam at least two times for a strong attachment.
Install duct work either under the floors or through the wall to reach the upper levels of a home. If you are going to an addition, then you simply connect the new duct work to an existing hot air duct. Cut an opening and use a collar to connect the two. Peel back the insulation as before and use two clamps to connect to the collar.
Support the duct work with metal support hangers. Some companies will have specific types that must be used, but a regular duct hanger can be used in most cases.