A standard residential gas furnace replacement—involving the removal of the old unit, disconnection of gas, electrical, and venting lines, and the precise installation and calibration of a new high-efficiency system—typically takes 4 to 8 hours (or roughly one full working day) for an experienced two-person HVAC technician crew. If complex ductwork modifications, transitioning from a standard chimney vent to PVC sidewall venting for a high-AFUE condensing furnace, or electrical upgrades are required, the installation may extend across a full day and a half.
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