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DCL
I don't want to cause any panic and/or alarm, but your ducts might be leaking. Leaking ducts can reduce your heating and cooling system's energy efficiency by 10 to 30 percent. Imagine, one third of your heating-bill money may be going to waste. You might as well throw your money down a hole.
Leaking ducts also reduce the quality of your indoor air. Improperly sealed ducts can move chemicals like methane or carbon monoxide from the basement or outdoors and deliver those substances to your living room via your HVAC system. Other problematic chemicals may include dust, fertilizer, pesticide and allergens.
