Top 7 HVAC companies in Lake, Illinois

Lake County, Illinois, holds a population of 696,535. Public listing data collected on 2026-08-16 supplies the raw material for this shortlist of HVAC contractors. Companies receive a Bayesian-adjusted rating that pulls each star rating toward the national mean of 4.764 until review volume grows large enough to stand alone. Additional signals include a public website, HVAC-specialist status, and published 24/7 availability. The result is a shortlist built from public data, not a review of work performed.

The shortlist

Custom Climate Comfort Inc.

Custom Climate Comfort Inc. operates from 26465 N Cherrywood Ln, Wauconda, IL 60084 as a general contractor that lists 24/7 availability and maintains a public website. Its 45 reviews produce a raw rating of 4.9. The Bayesian adjustment lifts the score from 4.846 to the final 4.906 because the review count remains modest relative to the national mean of 4.764. These numbers cannot reveal whether the firm carries the insurance limits required by any particular Lake County municipality.

Arctic Enterprises, Inc

Arctic Enterprises, Inc operates from 2520 IL-176 Ste 8, Crystal Lake, IL 60014. The firm lists (815) 893-4381, operates as a general contractor, and publishes 24/7 availability along with a website. Eleven reviews at a raw 5.0 receive a downward Bayesian adjustment to 4.887 because the small sample sits above the national mean of 4.764. The numbers leave open the question of how the firm handles peak winter service demand in a 5A climate zone.

All-Star Mechanical Services

All-Star Mechanical Services lists its address as 14 Lake Vista Ct, Lindenhurst, IL 60046 and its phone as (847) 641-1200. Five reviews at a raw 5.0 place it third after adjustment to 4.838. The firm appears as a general contractor with a website but no published 24/7 line. The modest review count produces only a small downward pull from the national mean. The figures supply no information on actual response times during the winter design-temperature period of 0 °F.

C&C Heating & Air Conditioning

C&C Heating & Air Conditioning is located at 4418 E Wonder Lake Rd, Wonder Lake, IL 60097 and can be reached at (815) 728-1067. Twenty-nine reviews yield a raw rating of 4.6 that adjusts upward to 4.743 because the score sits below the national mean of 4.764. The firm lists 24/7 availability and a website while operating as a general contractor. The numbers do not indicate whether the listed labor rate of $125 per hour matches actual project invoices in Lake County.

Tri-Star Heating and Cooling

Tri-Star Heating and Cooling lists 3209 Park Dr, Island Lake, IL 60042 and the number (847) 497-9768. Its five reviews at a raw 4.2 adjust upward to 4.743. The firm operates as a general contractor, maintains a website, and publishes 24/7 availability. Because the review count is low, the adjustment moves the score closer to the national mean of 4.764. These data points cannot address whether the firm’s installations routinely meet the 5,900 heating degree days recorded for the county.

Thompson Heating and Cooling

Thompson Heating and Cooling is based at 4500 Roberts Rd, Island Lake, IL 60042 and lists (847) 796-6652. Sixteen reviews at 4.6 adjust slightly upward to 4.727. The firm shows 24/7 availability but no public website and operates as a general contractor. The modest review volume produces a small Bayesian pull toward the national mean. The published figures leave open the question of whether permit fees between $150 and $550 are routinely included in its project totals.

Seasons Heating & Air Conditioning, Inc.

Seasons Heating & Air Conditioning, Inc. lists 1724 E Grand Ave, Lake Villa, IL 60046 and the phone number (847) 548-6588. Nineteen reviews at a raw 4.2 adjust upward to 4.585. The firm maintains a website, operates as a general contractor, and does not publish 24/7 availability. The review count keeps the adjusted score noticeably below the national mean of 4.764. The data cannot show how the firm performs when summer design temperatures reach 91 °F with high humidity.

How to choose

Companies are ranked by a Bayesian-adjusted rating: a company's star rating is pulled toward the national mean until it has enough reviews to stand on its own, so a 5.0 from four customers does not outrank a 4.9 from two hundred. Small tie-breakers apply for a public website, for being listed as an HVAC specialist rather than a general contractor, and for published 24/7 availability. This is a shortlist built from public listing data, not a review of work performed.

Cost

Installed-cost data show a typical full-system price of $10,450, with a reported range of $9,400 to $11,500. A separate 2025 invoiced average sits at $12,836, and the upper quartile reaches $17,601. Labor is listed at $125 per hour. Permit fees range from $150 to $550. The two cost sources disagree, and that spread itself supplies information about variability across Lake County projects.

Climate

Lake County falls in IECC zone 5A with a moist regime. Heating degree days total 5,900 while cooling degree days reach only 1,100, producing a heating-leaning mixed load. Chicago design temperatures are 0 °F in winter and 91 °F in summer. Winters are very dry and summers humid. Natural gas remains the primary heating fuel, and dual-fuel heat-pump systems are common. High-efficiency condensing furnaces are standard because the climate imposes sharp winter peaks and occasional intense summer cooling loads.

Licensing and permits

Illinois has no state HVAC contractor licensing board. Licensing and mechanical permitting are handled by individual municipalities. Chicago does not issue an HVAC-specific trade license; HVAC work requiring a building permit generally falls under Chicago's General Contractor license. Insurance requirements vary by jurisdiction; Chicago General Contractor licenses require general liability coverage of $1,000,000 to $5,000,000 per occurrence depending on class. Permits are required at the local level rather than statewide.

Incentives

The Illinois Home Energy Rebates program is in conditional pilot phase with a planned $8,000 heat-pump rebate. Utility programs through ComEd, Ameren Illinois, Nicor Gas, and Peoples Gas offer $300 to $1,500 and require participation in a program-ally contractor network. No state tax credit exists for HVAC. Federal 25C and 25D credits expired at the end of 2025. Only commercial or third-party-owned systems may access the 48E ITC in 2026. Homeowners must therefore select installers already inside utility networks to access available rebates.

Lake County’s combination of municipal licensing, heating-dominant climate, and utility rebate networks favors contractors that publish availability and maintain the required program-ally status.