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Repair or replace an old AC or furnace?

Short answer

If it’s old, needs a costly repair, and keeps breaking, replacing may make sense. Get a second written quote before deciding.

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