Geothermal Installation Timeline in Montgomery (2026)

Key Takeaways

A typical Montgomery geothermal installation takes 5–10 working days from first dig to system commissioning.
Horizontal loops complete faster (3–5 days). Vertical loops take longer due to drilling but require less yard footprint.
Permitting and design adds 2–4 weeks before any ground work begins.
Plan the project for spring or early fall — installs are far harder during peak summer heat or winter freeze cycles.

Geothermal installation is more involved than standard HVAC replacement. It's not "swap the unit and you're done" — it's an excavation project, an HVAC project, and a system commissioning project rolled into one. This guide walks through the realistic timeline for a Montgomery geothermal installation, what each phase actually involves, and what to expect at every stage.

Phase 1: Site Assessment and Design (1–2 weeks)

Before any equipment arrives or ground breaks, your contractor needs to determine:

Heating and cooling load of your home (Manual J calculation)
Soil composition and thermal conductivity at your property
Lot conditions — available yard space, existing utilities, septic, hardscape
Whether horizontal or vertical loop is appropriate
Proper sizing of indoor unit and loop length

This phase usually takes 1–2 weeks. A site visit is followed by engineering drawings and a written proposal with both options where they apply.

Phase 2: Permits and Approvals (1–3 weeks)

Geothermal installations require permits in Montgomery. Your contractor handles the paperwork, but the city or county processing time depends on workload. Plan for 1–3 weeks of permit review before excavation can start.

If your home is on a septic system, additional review may be required to confirm loop placement won't conflict with leach fields. If you have HOA restrictions, those need clearance before work begins.

Phase 3: Equipment Order and Scheduling (1–4 weeks)

Once permits are cleared, your contractor orders the indoor heat pump unit, ground loop pipe, and any specialized fittings. Lead times vary by manufacturer and demand. Most installations launch within 1–2 weeks of permit approval; some specialty units can take 4 weeks.

Phase 4: Ground Loop Installation (2–5 days)

Horizontal loop installation (2–4 days)

Day 1: Mark utilities, layout trenches, begin excavation. Trenches are 4–6 feet deep, 200–800 feet of total length depending on system size.
Day 2: Continue excavation, lay pipe loops in trenches, connect headers.
Day 3: Pressure-test the loop, fill with antifreeze solution, backfill trenches.
Day 4: Run supply/return lines from loop to house, prepare entry penetrations.

Vertical loop installation (3–5 days)

Day 1–2: Set up drilling rig, drill first boreholes (100–400 feet deep, depending on system size and soil).
Day 2–3: Continue drilling, insert U-bend pipes, grout each borehole.
Day 3–4: Install horizontal headers connecting boreholes, pressure-test the system.
Day 4–5: Backfill any excavated headers, run supply/return lines to house.

Phase 5: Indoor Unit Installation (1–2 days)

This phase looks similar to a traditional HVAC replacement:

Remove old indoor unit if applicable
Install heat pump unit, typically in basement, garage, or utility room
Connect to existing or new ductwork
Connect ground loop supply and return lines to indoor unit
Install desuperheater (if included — for water heating assist)
Install thermostat and controls
Run electrical and complete wiring connections

Phase 6: Commissioning and Testing (½–1 day)

After install completes, your contractor runs through a commissioning checklist:

Pressure-test the entire system
Verify refrigerant charge
Confirm flow rates through loop
Test heating and cooling cycles
Calibrate thermostat
Walk you through operation and maintenance
Provide AHRI certification documentation for tax credit filing

Phase 7: Yard Restoration (varies)

For horizontal loops, expect noticeable lawn impact in the area where trenches were dug. Most contractors regrade and reseed the affected area as part of the install. Full grass recovery typically takes 1–2 growing seasons depending on time of year and weather.

Vertical loops have minimal lawn impact since drilling is contained to small bore points.

Realistic Total Timeline for Montgomery

Phase	Horizontal Loop	Vertical Loop
Site assessment + design	1–2 weeks	1–2 weeks
Permits and approvals	1–3 weeks	1–3 weeks
Equipment lead time	1–4 weeks	1–4 weeks
Ground loop install	2–4 days	3–5 days
Indoor unit install	1–2 days	1–2 days
Commissioning	½–1 day	½–1 day
From decision to operational	4–8 weeks total	4–9 weeks total

Best Time of Year to Install Geothermal in Montgomery

Spring (March–May) and early fall (September–October) are the ideal windows. Reasons:

Ground is workable (not saturated, not baked dry)
Outdoor temperatures are pleasant for excavation crews
Your existing HVAC can stay in service while the geothermal install happens — the changeover happens at the very end
Avoiding peak summer means you're not without HVAC during emergency periods

Summer installs are possible but harder on the install crew and have schedule risk if peak-season AC emergencies pull contractor capacity. Winter installs are possible in Montgomery (mild climate) but more weather-dependent.

What You'll Need to Do as the Homeowner

Be present for the initial site visit
Approve the design and proposal in writing
Confirm loop layout location before digging starts
Provide access to electrical panel, water heater area, and indoor install location
Be home for a final walk-through and commissioning
Retain the AHRI Certificate and contractor invoice for tax credit filing

What to Watch For During Installation

Properly marked utilities before any digging (your contractor calls 811)
Pressure testing of the loop before backfilling — you should see this happen
Quality of the grout used in vertical bore loops
Proper labeling of supply and return lines at the indoor unit
Calibration documentation as part of commissioning

Get a Geothermal Project Timeline for Your Home

Chad's AC Direct will scope your geothermal project from first site visit through final commissioning, with a realistic week-by-week timeline you can plan around.

Schedule My Site Visit →

Frequently Asked Questions

Will I be without HVAC during the install?

No. Your existing HVAC stays in service until the very end of the project. The changeover happens during the final commissioning phase, usually within a single day.

Do I need to leave my house during installation?

No. You can stay in your home throughout the project. Excavation crews work outside; indoor unit installation is contained to the equipment room.

How loud is the drilling for vertical loops?

Drilling rigs are noticeably loud during operation, comparable to other construction equipment. Drilling typically runs during normal business hours over 2–3 days. Neighbors should be notified in advance.

Can I expand the system later if I add square footage?

Yes, with planning. Loop sizing is critical — discuss future expansion plans with your contractor during initial design so the loop can accommodate future load.

What permits are required in Montgomery?

Standard mechanical and electrical permits, plus excavation/trenching permits depending on scope. Your contractor handles all permit applications.

How does this compare to traditional HVAC replacement timing?

Traditional HVAC replacement is 1–3 days end-to-end. Geothermal is 4–9 weeks end-to-end (from first call to commissioning) due to design, permits, equipment, and ground work.

How Long Does Geothermal Installation Take in Montgomery? (Step-by-Step Timeline)