Looking for a geothermal installer in Lake Forest, IL? Describe your project once and up to three geothermal installers who work in Lake Forest and Lake County get back to you with a quote. It's free and there is no obligation.
Lake Forest is home to about 19,642 people (2024 Census Bureau estimate), a growing community (+1.4% since 2020). With 1,142 people per sq mi, it is a suburban area. Homes with yards and long heating seasons are good candidates for geothermal systems here.
Lake Forest at a glance
- Population (Census Bureau estimate, 2024)
- 19,642 (+1.4% since 2020)
- Rank in Illinois
- 125th of 1,294 cities and towns
- Land area
- 17 sq mi
- Population density
- 1,142 people per sq mi (suburban)
- Type
- City (Lake Forest city)
- Main county
- Lake County
What to check before hiring in Lake Forest
- Permits: in Illinois, 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
-
U.S. Department of Energy: geothermal heat pumps
Official information and guidance.
-
ENERGY STAR
Official information and guidance.
Services available in Lake Forest
-
Geothermal heat pump system
Design and installation of a ground-source heat pump with vertical or horizontal loops.
-
Geothermal repair or replacement
Repair or replacement of the heat pump unit on an existing loop.
Frequently asked questions in Lake Forest
How much does geothermal cost in Lake Forest, IL?
It depends on the loop, the drilling and the unit. Describe your home: installers who serve Lake Forest 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 Lake Forest 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.