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How long should a furnace or AC last?

Short answer

Many last around 15 years or more with maintenance, but it varies. Yearly checkups help catch problems early.

Rules differ by state. This is general information, not legal or professional advice.

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Official sources

Energy Saver (U.S. Dept. of Energy)energy.gov
CDC: carbon monoxide safetycdc.gov
Ready.gov: extreme heat and winter weatherready.gov