Illinois HVAC Service Agreement (Free Template + State Notes)

What Your Illinois HVAC Contract Should Include

The builder formats these into a clean, professional agreement:

• Parties & Premises: Legal names, service address, site contact, access windows; attic/crawl/roof access as applicable.
• Scope of Work: Repair/replace/maintain; systems covered (split/packaged, heat pumps incl. cold-climate, gas furnace/boiler & hydronic, mini-split/VRF, RTUs; ERV/HRV; controls).
• Service Levels: Standard vs. emergency; after-hours; snow/ice/freezing, high wind, poor AQI rescheduling & safety language.
• Pricing Model: Flat-rate vs. time-and-materials; trip fee policy; parts handling/mark-up.
• Materials & Parts: OEM or equivalent; low-ambient/defrost controls; condensate safeties & freeze protection; curb adapters & hail guards for RTUs.
• Customer Responsibilities: Filters, clearances, utilities, HOA/condo approvals, roof access, snow/ice removal for safe access.
• Warranty: Labor window; manufacturer pass-through; exclusions (misuse, neglect, freeze/wind/hail/smoke damage, non-payment).
• Code & Safety: Local permits/inspections; IMC/IECC with municipal amendments (e.g., Chicago); EPA refrigerant rules; rooftop fall protection; condensate disposal to code.
• Change Orders: Written/e-signed authorization for hidden conditions and price changes.
• Payment Terms: Deposits/milestones; due-on-completion; late fees.
• Termination: For convenience vs. cause; cure periods; demobilization costs.
• Dispute & Venue: Illinois law; optional county venue (Cook, DuPage, Lake, Will, Kane, Winnebago, etc.).
• Licensing Info: Legal business name and any required municipal contractor registrations/licenses printed on the agreement (e.g., City of Chicago; plus electrical/plumbing subs where applicable).

Illinois-Specific Notes (Read Before You Sign)

Licensing/registration: Illinois has no single universal statewide HVAC contractor license; many cities require their own contractor registration or license (notably the City of Chicago). Display your legal name and any required municipal numbers on proposals and the contract. Electrical/plumbing work uses state or municipal licensing—use properly licensed subs where required.

Permits & inspections are local: Mechanical/electrical/gas permits are issued by city/village/county AHJs (e.g., Chicago, Aurora, Naperville, Joliet, Rockford, Springfield). Confirm plan review (especially for rooftop equipment/wind design), permit fees, and inspection timing before change-outs/new installs.

Energy/mechanical codes: Municipalities adopt IMC/IECC/IRC (Chicago uses its own code set aligned with ICC). If your scope triggers duct sealing/leakage testing, ventilation/ERV balancing, economizers on certain RTUs, or commissioning, state responsibilities and testing fees in the contract.

Climate & rooftops: Call out freeze protection (condensate traps/heat, pan safeties), snow/ice access, curb adapters and anchorage for RTUs, and hail guards for exposed coils. For AQ events (wildfire smoke), include filter upgrades (MERV) and service limitations at hazardous AQI.

Cooling-off (in-home sales): For covered door-to-door/home solicitations, customers generally have a 3-business-day right to cancel. Attach the written notice when applicable.

Liens: Illinois recognizes mechanic’s lien rights with specific timelines & notices. Keep clear payment terms and retain proof of required notices/waivers per your workflow.

This page is general business guidance, not legal advice. Requirements can change—verify rules for your municipality and project type.

Example Pricing & Payment Terms (Illinois)

Flat-Rate Example

Flat-Rate Replacement: Contractor will replace the condenser fan motor on the 4-ton split system at 121 N LaSalle St, Chicago, for a fixed price of $535 plus applicable taxes/permit fees. Includes travel within 20 miles and standard disposal.

Time & Materials Example

Labor: $135/hour (first hour billable in full, then 30-min increments).
Materials: Cost + 25% handling.
Trip Fee: $75 per on-site visit (roof access fee may apply where required).

Deposits & Late Fees (Sample)

• Deposit: 30% on acceptance for projects over $3,000; balance due on completion.
• Late Fee: 1.5%/month (or the maximum allowed by law) on past-due balances over 15 days.

Maintenance Plan Addendum (Illinois)

• Coverage: 2 seasonal tune-ups/year per covered system (spring cooling; fall heating) — optional mid-winter heat-pump check.
• Tasks: Coil cleaning as needed; condensate freeze-protection checks; electrical tighten; refrigerant check; burner safety checks where applicable; rooftop safety protocols; HRV/ERV filter & core inspection.
• Filters: Customer- or Contractor-supplied; sizes and intervals listed in annex; consider higher MERV during smoke events.
• Priority: Plan members get priority scheduling and 10% labor discount on non-covered repairs.
• Exclusions: Non-maintenance repairs, code corrections, concealed defects, abuse, freeze/wind/hail/smoke damage unless otherwise stated.
• Term: 12 months; auto-renews unless canceled 30 days prior.

Copy-Ready Clause Examples

Contractor Registration/License & Identification

Contractor is registered/licensed as required by the local authority having jurisdiction for the work described. Contractor’s legal name and Municipal Registration/License No. IL-MECH-{{your_number}} appear on this agreement and related communications. State-/municipal-licensed subcontractors will be used for electrical/plumbing scopes where required.

Freeze Protection, Rooftop Wind & IAQ

Where required by code, manufacturer, or site conditions, equipment will include condensate freeze protection (e.g., heat/trap/overflow safeties), rooftop anchorage/curb adapters and hail guards, and filtration adjustments during poor air quality events as specified.

Change Orders

No change in scope, parts, or price is valid unless authorized by a written or electronic change order signed by both parties.

Cooling-Off (If Sold In-Home)

If this agreement was solicited and signed at Customer’s residence, Customer may have a three (3) business-day right to cancel. If applicable, a separate cancellation notice is attached explaining how to cancel and where to send notice.

Dispute Resolution & Venue

This agreement is governed by the laws of the State of Illinois. Venue for any action lies in the county where the project is located, unless the parties agree otherwise in writing.

Illinois HVAC Contract — FAQs