Why does not freshwater lakes become salty eventhough it meets ocean at somepoint? Do oceans grow more or less salty over time? If the oceans were only as salty as a fresh water lake, and had always been that way, would there be more life in the oceans that had evolved ...
Replacing a boiler typically costs an average of $50-$300, but this price can be drastically higher depending on where you live and the location of the boiler. Replacing leaking, aging, or bad ductwork costs an average of $35-$55 a linear foot for labor and materials, depending on the length and type of ducts.
Regular efficiency boilers range in price from $2,500 to $4,000 with an average cost of $3,250. High-efficiency models cost between $5,000 and $9,000 with an average cost of $7,000. 1  Air Handler or AHU.