If your HVAC system is on its last legs, breaks down frequently, and isn’t keeping your home comfortable, it may be time to replace it. According to a study published by National Association of Home Builders and Bank of America, the average life expectancy of a ducted heating and air conditioning system is around fifteen years. Because furnaces last a bit longer than air conditioners, the AC units are often replaced first, which is unwise, because you always get the best performance and…

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