The average time it takes for professional HVAC technicians to remove an old residential furnace and install a brand-new heating unit typically ranges from four to eight hours for a standard, straightforward replacement. If the new furnace is identical in size, fuel type, and configuration to the old unit, the swap can often be completed in half a day. However, if the installation requires complex modifications—such as transitioning from an oil system to a gas system, upgrading ductwork, modifying gas supply lines, or installing high-efficiency PVC venting flues through exterior walls—the job can easily take a full day or stretch across two consecutive days. You can verify the success of the installation by observing the final testing cycle where the technician verifies warm airflow and proper burner ignition.
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