Looking for a geothermal installer in Modesto, CA? Describe your project once and up to three geothermal installers who work in Modesto and Stanislaus County get back to you with a quote. It's free and there is no obligation.
Modesto is home to about 220,592 people (2024 Census Bureau estimate), a stable community (+1.0% since 2020). With 5,088 people per sq mi, it is a densely built-up area. Homes with yards and long heating seasons are good candidates for geothermal systems here.
Modesto at a glance
- Population (Census Bureau estimate, 2024)
- 220,592 (+1.0% since 2020)
- Rank in California
- 19th of 482 cities and towns
- Land area
- 43 sq mi
- Population density
- 5,088 people per sq mi (densely built-up)
- Type
- City (Modesto city)
- Main county
- Stanislaus County
What to check before hiring in Modesto
- Permits: in California, 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 Modesto
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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 Modesto
How much does geothermal cost in Modesto, CA?
It depends on the loop, the drilling and the unit. Describe your home: installers who serve Modesto 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 Modesto 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.