Installation Guide
How Long Does AC Installation Take?
Most homeowners wonder what to expect on installation day. The honest answer: a standard AC replacement typically takes 4-8 hours, but several factors can push that to a full day or beyond.
Timeline for a Standard AC Replacement
- Straightforward replacement (same size, no ductwork changes): 4-6 hours. A two-person crew can disconnect the old outdoor unit and air handler, install the new equipment, connect refrigerant lines, evacuate and charge the system, test operation, and clean up in a half day.
- First-time installation or system conversion: 6-12 hours. If adding a split system where none existed before, installing new line sets, or converting from window units to central AC, the work takes longer.
- Ductwork modifications: add 1-3 days. If the ductwork needs resizing, repair, or significant modification, that work may be done before the equipment swap or alongside it.
- Full HVAC system (AC + furnace): 6-10 hours for a straightforward replacement by an experienced crew.
What Happens During Installation
- Disconnect and recover refrigerant from the old system (required by EPA regulations)
- Remove outdoor condenser unit and indoor air handler or coil
- Install new outdoor unit on pad or brackets
- Install new indoor unit (air handler or coil)
- Connect refrigerant lines; if existing lines are reused, confirm they are clean and leak-free
- Connect electrical, thermostat wiring, and condensate drain
- Evacuate the refrigerant lines (remove air and moisture with a vacuum pump)
- Charge with refrigerant to manufacturer spec
- Test system operation, airflow, and temperature differential
- Walk homeowner through system operation and filter location
How to Prepare for Installation Day
Clear a path to the outdoor unit and indoor air handler. Remove items stored near the air handler (basement, closet, attic). Ensure pets are secured away from the work area. Have the thermostat accessible. Plan to be home or have someone available -- the crew will need your signature on the job completion paperwork and should walk you through the new system.
Frequently Asked Questions
- How long does it take to install a new AC unit?
- A standard central AC replacement takes 4-6 hours for an experienced two-person crew. Installations requiring new line sets, ductwork modifications, or combined AC and furnace replacement may take 8-12 hours or span two days.
- Can I stay home during AC installation?
- Yes, and in most cases it is a good idea. You will need to be available to answer questions, grant access to different areas of the home, and sign off on the completed work. The crew will also walk you through the new system at completion.
- What do I need to do before AC installation?
- Clear access to the outdoor unit (2 feet of clearance) and the indoor air handler. Remove items stored near the air handler. Secure pets. Ensure the thermostat is accessible. Have someone home on installation day to sign off and walk through the completed installation.
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