Looking for a geothermal installer in Duncan, SC? Describe your project once and up to three geothermal installers who work in Duncan and Spartanburg County get back to you with a quote. It's free and there is no obligation.
Duncan is home to about 4,594 people (2024 Census Bureau estimate), a growing community (+13.5% since 2020). With 694 people per sq mi, it is a semi-rural area. Homes with yards and long heating seasons are good candidates for geothermal systems here.
Duncan at a glance
- Population (Census Bureau estimate, 2024)
- 4,594 (+13.5% since 2020)
- Rank in South Carolina
- 69th of 271 cities and towns
- Land area
- 6.6 sq mi
- Population density
- 694 people per sq mi (semi-rural)
- Type
- Town (Duncan town)
- Main county
- Spartanburg County
What to check before hiring in Duncan
- Permits: in South Carolina, vertical loops may need a well or drilling permit in addition to the mechanical permit.
- Design: ask for a load calculation and loop design.
- Incentives: check current utility and state programs.
- Price drivers: loop type and length, drilling conditions and the unit.
Useful official resources
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U.S. Department of Energy: geothermal heat pumps
Official information and guidance.
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ENERGY STAR
Official information and guidance.
Services available in Duncan
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Geothermal heat pump system
Design and installation of a ground-source heat pump with vertical or horizontal loops.
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Geothermal repair or replacement
Repair or replacement of the heat pump unit on an existing loop.
Frequently asked questions in Duncan
How much does geothermal cost in Duncan, SC?
It depends on the loop, the drilling and the unit. Describe your home: installers who serve Duncan reply with a quote.
How long does installation take?
Often one to two weeks, including loops.
Will my yard be torn up?
Temporarily; ask about restoration.
Which geothermal installers will contact me?
Up to three independent geothermal installers who serve Duncan and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.