WaterFurnace is the most recognized name in residential geothermal — and it prices accordingly. A WaterFurnace system installed in a typical American home costs $25,000 to $50,000before incentives. That's a wide range because a lot of variables drive the number: which WaterFurnace series you install, what loop type your property allows, how large your home is, and where you live.
This guide breaks each of those variables down so you know what drives the quote you received — and whether it's reasonable.
Cost Summary
3 Series
$20K–$32K
5 Series
$24K–$40K
7 Series
$30K–$50K
After 30% credit
$17K–$35K
Installed cost including unit, ground loop, and labor. Before any tax credits or state rebates.
What You're Paying For
A WaterFurnace installation has three main cost components. Understanding each helps you evaluate quotes and spot what's driving a high or low number.
1. The heat pump unit
25–35% of totalThe indoor WaterFurnace unit itself — compressor, heat exchanger, air handler. The 3 Series runs $4,500–$7,000 for the equipment. The 7 Series runs $10,000–$15,000. Prices vary by tonnage (2–6 tons for most homes).
2. The ground loop
35–50% of totalThe buried pipe network that collects heat from the ground. This is often the biggest cost variable. Vertical loops (drilled wells) cost $10,000–$20,000+. Horizontal loops cost less but need more land. Pond loops are the cheapest if a water body is available.
3. Labor and installation
20–30% of totalElectrical work, ductwork modifications if needed, loop connections, commissioning, and permits. Labor rates vary significantly by region — a rural installer in Indiana may charge half what one in Connecticut does.
Cost by Series
WaterFurnace makes three residential series. The 7 Series is the flagship — variable speed, highest efficiency, most features. The 3 Series is the entry-level single-stage unit. The 5 Series sits in the middle with two-stage operation.
| Series | Type | Peak COP | Unit cost | Installed |
|---|---|---|---|---|
| 3 Series | Single-stage | Up to 3.6 | $4,500–$7,000 | $20,000–$32,000 |
| 5 Series | Two-stage | Up to 4.5 | $7,000–$10,000 | $24,000–$40,000 |
| 7 Series | Variable-speed | Up to 5.3 | $10,000–$15,000 | $30,000–$50,000 |
Is the 7 Series worth the premium?For most homeowners in cold climates, yes. The efficiency difference adds up to real money over 20 years. In a mild climate where you're primarily cooling, the payback is slower — the 5 Series may be sufficient.
Cost by Loop Type
Your property determines your loop options. If you don't have land for a horizontal loop or a pond nearby, vertical is the default — and vertical is expensive because drilling is expensive. Here's how costs break down:
Vertical (drilled)
$30,000–$50,000Most common in suburbs. Loop cost $10K–$20K+ depending on depth and well count.
Horizontal (trenched)
$22,000–$35,000Requires 0.5–1.5 acres of yard. Lower loop cost but needs land.
Pond/lake loop
$18,000–$30,000Least expensive loop if a body of water is accessible on or near the property.
Open loop
$15,000–$28,000Uses well water directly. Low cost but requires adequate well yield and water quality.
Ranges assume a 5 Series unit for a 2,000–2,500 sq ft home. 7 Series adds $4,000–$8,000 to each range.
The Tax Credit Math
The 30% Residential Clean Energy Credit applies to the full installed cost — equipment, loop, labor, and permits. No dollar cap. It reduces your actual tax liability dollar for dollar.
State incentives vary significantly. See state-by-state incentives here. Some states add another $1,000–$8,000 on top of the federal credit.
Regional Variation
Where you live affects cost more than most people expect. Labor and drilling rates vary enormously by market. A few benchmarks from installer quotes in our directory:
- Midwest (OH, IN, IL, MN): Generally the most competitive pricing — $24,000–$40,000 for a 5 Series vertical.
- Mid-Atlantic (PA, VA, MD): Moderate — $28,000–$44,000, strong installer density.
- Northeast (VT, ME, MA, CT): Higher labor costs — $32,000–$50,000, but strong state incentives often offset.
- Mountain West / South: Thinner installer networks can push quotes higher — $30,000–$52,000.
Always get at least three quotes. See real homeowner-submitted costs by state.
Is WaterFurnace Worth the Cost?
For homeowners replacing oil, propane, or electric resistance heat in cold climates, yes — the combination of efficiency, system longevity, and the 30% credit makes WaterFurnace one of the more justifiable premium products in HVAC.
If you're replacing a newer gas system in a mild climate, the numbers are tighter and the payback extends. Run the numbers on your actual heating bills before deciding.
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