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by Tom Morgan HEATING SYSTEM RETROFI TS Few heating systems last forever. They may be replaced due to damage, or because newer models offer greater energy efficiency. But often parts of the original system—piping, radiators, ducts, or flues—are worth salvaging. When tying the new system into existing components, it's critical that the new equipment be well matched to the old. If not, the updated system will not live up to its potential. In my work as a commercial and residential home inspector, I see three main types of systems: steam, hydronic, and warm air. Steam Steam systems can be finicky and their heating output difficult to finetune. But they are common in older New England homes and may be worth upgrading with a