Some homeowners choose duct sealing as a DIY project. Start by sealing air leaks with putty or metal tape and insulate any ducts you can access (such as those in attics, mezzanines, unfinished basements and garages). Never use adhesive tape, as it is not durable. Sealing ducts from the inside out is a much more complicated process and will probably require hiring a professional.
Basically, what they will do is spray the inside of the duct with a liquid rubber sealant. Most homeowners don't think about sealing their home's air ducts, but the process is crucial to maintaining the energy efficiency of their home. If there is a gap on the side of one of these pipes, repairing it can be as easy as applying adhesive tape to seal the hole. For today's die-hard DIYers, these are the basics of duct sealing and gap repair techniques in most modern systems.
They will then pressurize the duct system with a fan and use a computer to analyze the data and determine how much air escapes through the ducts. In a duct system, the main line is rarely made of flexible ducts, but is more likely to be comprised of metal or fiberglass. In the smallest gaps in the main duct line, basic self-made caulking or adhesive tape applications can provide great resealing capacity. Either way, having your ducts properly sealed will help you balance the air temperature in your home and improve the quality of air.
