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Although older furnace and boiler systems had efficiencies

Although older furnace and boiler systems had efficiencies in the range of 56% to 70%, modern conventional heating systems can achieve efficiencies as high as 98.5%, converting nearly all the fuel to useful heat for your home energy efficiency upgrades and a new high-efficiency heating system can often cut your fuel bills and your furnace's pollution output in half upgrading your furnace or boiler from 56% to 90% efficiency in an average cold-climate.

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