Quick reference — installation timelines by system type
| Installation type | Typical timeline | What affects it |
|---|---|---|
| Furnace replacement | 4–8 hours (one day) | Equipment access, duct connections, whether gas line modifications are needed |
| Central AC installation | 4–8 hours (one day) | Condenser placement, refrigerant line routing, existing ductwork condition |
| Full system replacement (furnace + AC) | 6–10 hours (one day, occasionally two) | Combined scope — both systems removed and installed in sequence |
| Heat pump installation (ducted) | 6–10 hours (one day, occasionally two) | Electrical work required, duct modifications, outdoor unit placement |
| Mini split installation (single zone) | 3–6 hours (one day) | Wall penetration location, line set routing, indoor unit mounting |
| Mini split installation (multi-zone) | 1–2 days | Number of indoor units, line set routing complexity |
| New construction HVAC (rough-in) | 1–3 days depending on home size | Square footage, number of zones, duct design complexity |
| New construction HVAC (final install) | 1–2 days | Equipment type, coordination with other trades |
| Commercial HVAC installation | 1 day to 2 weeks | Building size, number of units, ductwork scope, access requirements |
What a typical residential installation day looks like
For a standard furnace or AC replacement in a Livonia home, here is how the day generally unfolds:
Crew arrives and setup begins
Drop cloths are placed to protect flooring. The work area is assessed, and the old system is photographed and documented before removal begins.
Old equipment removed
Existing furnace, AC condenser, or both are disconnected, removed, and prepped for disposal. Gas lines and refrigerant lines are properly capped during this phase.
New equipment installed and connected
New system is set in place, connected to existing ductwork, gas line (for furnaces), refrigerant lines (for AC), and electrical. This is typically the longest phase.
System startup and testing
The system is started, pressures and temperatures are checked, and the equipment is run through both heating and cooling cycles (where applicable) to verify correct operation.
Cleanup and homeowner walkthrough
Work area is cleaned, old equipment is removed from the property, and we walk you through the new system — thermostat setup, filter location, and what to expect in the first few cycles.
What can extend the timeline beyond one day
Duct modifications or repairs
If existing ductwork needs resizing, resealing, or partial replacement to accommodate the new system, this adds time. We identify duct issues during the estimate so there are no surprises on install day.
Electrical panel work
Heat pump installations sometimes require a dedicated circuit or panel upgrade. If this is needed, it is coordinated with an electrician either before install day or during — which may extend the timeline.
Non-standard equipment locations
Attic air handlers, equipment in tight crawl spaces, or unusual flue routing configurations take more time than standard basement or utility room installations.
Larger home or complex layout
Homes over 3,000 sq ft with multiple zones or floors take longer to balance and test than smaller single-zone installations.
Custom fabrication needed
Occasionally a transition, plenum, or connection piece needs to be custom-fabricated on site to connect new equipment to existing ductwork. This is uncommon but adds time when it occurs.
What about the permit and inspection?
The permit is filed before installation day and does not affect how long the installation itself takes. The inspection, however, happens after the installation — typically within a few days to a week depending on the building department's schedule.
For City of Livonia installations, mechanical inspections are typically scheduled within 2-5 business days after permit filing. We coordinate the inspection directly and notify you when it is scheduled. The inspector visits, reviews the installation, and signs off — you do not need to be present, though you are welcome to be.
What to expect on your installation day: We give you a clear arrival window when scheduling. Plan to be home at the start of the job and available for the final walkthrough at the end — typically 30 to 45 minutes of your time total. For the hours in between, you do not need to stay home, though many homeowners do.
When to schedule — avoiding the seasonal rush
HVAC installation demand in Southeast Michigan follows a predictable seasonal pattern. Furnace installation requests spike in October and November when the first cold weather hits. AC installation demand peaks in May and June ahead of summer.
Scheduling during peak season typically means waiting 1-2 weeks or more for an installation slot. Scheduling in the off-season — late summer for furnace replacement, early fall for AC — usually means faster scheduling and more scheduling flexibility.
If your system is aging, getting a replacement scheduled before the seasonal rush is almost always worth doing. A two-week wait for a scheduled installation is far better than a same-day emergency replacement during a Michigan cold snap.
