McHenry County
Multifamily Insulation and Air Sealing in Crystal Lake, Illinois
- Property first
- Human review
- Clear next step
Which utility serves a building in Crystal Lake decides which efficiency program it can use. Here is what serves this municipality, what that opens, and what we look at in buildings of this age and type.

Utilities and programs for Crystal Lake
| Natural gas utility | Nicor Gas |
|---|---|
| Electric utility | ComEd |
| County | McHenry |
| Programs this opens | Nicor Gas energySMART and weatherization. ComEd Energy Efficiency Program. |
A multifamily property in Crystal Lake may qualify for work under these programs. Whether a specific building qualifies depends on the address, the utility account, the building, and current program requirements, so it is settled by a property-specific review rather than by this page. Utility territory can also split inside a municipality, and we confirm it by address before discussing a program.
The multifamily stock in Crystal Lake
ACS 2020-2024 5-year (table B25024): 15,256 total housing units, of which 2,561 (16.8%) are in buildings of 5 or more units and another 688 in 2-to-4 unit buildings. The multifamily stock is walk-up scale, not tower scale: the single largest multifamily category is 5-to-9 unit buildings at 1,664 units, versus 404 in 10-to-19, 233 in 20-to-49 and 260 in 50-plus. Renter-occupied share is 22.4% (3,315 of 14,806 occupied units). Construction era is genuinely mixed, with 3,998 units built 1990-1999, 2,492 built 1970-1979, 2,063 built 1980-1989, 2,025 built 2000-2009, 1,331 built 1960-1969 and 1,323 built 1950-1959. There are also 293 mobile homes.
Working in Crystal Lake
Our office is at 69 E Crystal Lake Ave, Crystal Lake.
We work on multifamily properties with 3 or more units. Most of a typical scope happens where residents are not: attics, roofs, basements, crawl spaces, rim joists, and common corridors. Where unit access is needed we schedule it in windows and give management the unit list and dates ahead of the crew.
Every project starts with a property-specific review. Diagnostic testing is selected according to the building, approved scope, safety conditions, and applicable program requirements. We prepare and file the utility program paperwork from pre-approval through final submission.
Utility territory sourced from the Illinois Commerce Commission filing for this utility. Housing figures are American Community Survey 5-year estimates. Checked 8 August 2026. Program availability changes, so we confirm the current requirements at the time of the review.
Next step
See what may apply to your Crystal Lake property
Send the address and we will confirm the utility, the program path, and what the assessment would look at.
