Duct Sealing

Houses with forced-air heating and cooling systems will have a ductwork used to distribute heated or cooled air throughout the house.
An air duct system is a branching network of tubes in the walls, floors, and ceilings.
The system should provide balanced supply and return flow to maintain a neutral pressure within the house.
An air duct system that is well-designed and properly sealed can make your home more comfortable, energy efficient, and safer. If the ducts are poorly sealed or insulated it’ll create a variety of problems that are likely to contribute to higher energy bills and difficulty keeping the house comfortable, no matter how the thermostat is set.
Ducts that leak into unheated spaces can increase your heating and cooling bills, but you can reduce that loss by sealing and insulating your ducts.
Leaks in your air ducts lead to a build-up of debris in your system, which also contributes to frequent breakdowns.
The ducts will suck up dust, dirt and a variety of other nasty contaminants all that will gets blown out the various vents in your home, creating indoor air quality problems.
All that extra debris also quickly clogs your air filter, which requires you to change it frequently.
Aside from sealing your ducts, the simplest and most effective means of maintaining your air distribution system is to ensure that furniture and other objects are not blocking the airflow.
Existing duct systems often suffer from design deficiencies in the return air system, any rooms with a lack of sufficient return airflow may benefit from relatively simple upgrades.
Some rooms may also be hard to heat and cool because of inadequate supply ducts or grilles. If this is the case, you should first examine whether the problem is the room itself: fix any problems with insulation, air leakage, or inefficient windows first. If the problem persists, you may be able to increase the size of the supply duct or add an additional duct to provide the needed airflow to the room.