Even with the best quality furnace or air conditioning system in the world, one needs a proper and effective duct work or else there will be loss of energy and money. This will cause the structure to have uncomfortable temperatures. Poor duct work will definitely affect negatively the quality of the air inside the rooms. Here are some essential facts on why tight ducts are effective for heating and cooling.
Majority of structures in America are installed with forced air-heating and cooling system. A main heating, ventilating and air conditioning system mostly a heat pump, furnace or A/C which creates cool or warm air that is blown around by powerful fans through interconnected ducts and registers to reach the various destinations within the structure. This is a repetitive process where the ducts that supply air, take the heated or cooled air to the rooms, while return ducts and registers do the reverse by drawing the room air back into the equipment to be heated or cooled.
One would want to avoid defective ductwork, where ducts network is not well linked to each other, or to the registers, or to the furnace plenum.
Loss of energy, the HVAC equipment must operate above its required optimum in order to compensate for the lost energy as heated or cooled air is lost out into unconditioned areas such as the basement area , spaces below the roof , and even cracks on the wall . Some rooms never reach their optimum required temperature, because much of the conditioned air is lost through the faulty ducts before it even reaches the intended destination or room. This mostly affects rooms at the far end of a building whose ducts are long but leaking. Poor quality of air, this is caused by contamination of air from cracks and basement spaces that mix through the leaking points, this causes changes in the air pressure. The contaminated air is then circulated in the structure, lowering the quality of the air from the plenum.
The best way to achieve an air-tight duct is to hire a professional to do inspection of the existing network of ducts and seal the leaks with the necessary insulation. Although one may temporarily seal leaking ducts using sealants such as metal-backed tape or even mastic sealant in areas where the ducts are obviously leaking.