Chicago Heat Ordinance: A Landlord's Practical Guide

Chicago landlords need a heating plan before the first cold apartment complaint. The city’s heat season runs from September 15 to June 1, but the correct rule depends on the building’s equipment. A shared boiler, individual furnace and combined heating-and-cooling system require different analysis.

This guide explains the current rules and a practical response process for rental owners. Sources were checked on October 19, 2026, including the municipal code’s 2026 amendments. The operating checklists below are management suggestions, not additional legal requirements.

Download the Chicago landlord temperature log and heating checklist to record complaints, readings, service calls and follow-up. Use it alongside the building’s actual equipment records.

Match the temperature rule to the heating system

Start with an equipment inventory. Ask your contractor which units each boiler, furnace or heat pump serves. Record who controls the equipment and who pays its energy bill. An apartment thermostat does not necessarily mean that apartment has an independent heating system.

For units served by a heating plant shared with another unit, Chicago Municipal Code §14X-8-802.2.2 sets these ordinary minimums during heat season:

Time	Minimum indoor temperature
8:30 a.m. to 10:30 p.m.	68°F
10:30 p.m. to 8:30 a.m.	66°F

These minimums cover habitable spaces, bathrooms and toilet rooms, with windows and exterior doors closed. They concern room temperatures, not the number displayed as the thermostat’s target.

A basement boiler serving three apartments is a common heating plant. So is a furnace that supplies multiple units. Calling the equipment “central heat” in a listing does not answer every question. Document what is actually installed.

The code allows equipment to be disengaged, or cooling to operate, during heat season when the required indoor minimum remains satisfied. September 15 does not require a burner to run continuously regardless of the weather.

Check the revised exception for combined systems

The same section allows a 64°F minimum where the same facilities provide heating and cooling:

• September 15 to October 31: before the first date with a nighttime outdoor temperature below 45°F.
• April 1 to June 1: on or after the first date with a daytime outdoor temperature above 75°F.

The current code records a May 20, 2026 amendment. Older summaries, including the city FAQ reviewed for this article, describe earlier transition dates. Use the current residential heat provision, and have the building’s professional confirm that its equipment qualifies.

If your building is described as a two-pipe system, ask the contractor to explain its changeover process. Do not apply this exception merely because an apartment has both a furnace and a separate window air conditioner. Keep the system description and weather evidence supporting a changeover decision. Avoid deciding eligibility from a tenant-facing thermostat photograph.

Individual furnaces still need working permanent equipment

The residential equipment standard requires permanent heating capable of maintaining 68°F when the outdoor temperature is -7°F. It covers habitable spaces, bathrooms and toilet rooms. Cooking appliances, domestic water heating equipment and portable heaters cannot supply that required capacity. See §14X-8-802.2.

This capacity rule is distinct from the shared-plant operating schedule. Do not tell a resident with an individual furnace that its inability to reach 68°F is acceptable because the shared-building overnight minimum is lower.

For individual equipment, a lease may place the energy expense on the occupant. The owner remains responsible for functioning heating equipment under §14X-8-802.2.1. A sentence saying “tenant pays gas” does not make a failed furnace the tenant’s repair obligation.

Separate equipment problems from account problems during the first call. Ask whether the furnace responds, whether other units are affected and whether a utility interruption has been reported. Do not ask residents to disassemble equipment, handle gas connections or bypass a safety control.

Include heating instructions in the move-in information. Identify the thermostat, emergency contact and ordinary service request method. Explain which utility accounts the resident must establish. Our Chicago tenant screening guide covers applicant review; the heating handoff belongs in the later move-in process.

Building heat requirements and RLTO remedies are different

An owner-occupied two-flat raises two separate questions: what heat must the building provide, and which tenant remedies apply? The answer to the second question does not cancel the first.

The RLTO generally excludes dwelling units in owner-occupied premises containing six units or fewer. Certain provisions still apply. That exclusion appears in §5-12-020. It is not an exemption from the separate existing-building heating code.

For covered tenancies, §5-12-110(f) addresses failures involving essential services, including heat. It contains notice requirements, several remedies and limitations. Its 24-hour and 72-hour provisions relate to particular remedies. They do not create a general waiting period before a heating violation exists.

The Department of Buildings describes failure of equipment when heat is required as an immediate violation in its heat ordinance guidance. Start the repair and resident-safety response promptly. Do not put an emergency ticket in a routine queue while counting down an assumed allowance.

Keep any rent-credit agreement specific: dates, amount, reason and payment method. Do not improvise a waiver of tenant rights. If the dispute involves withholding, termination or a demand letter, obtain advice about that tenancy’s coverage and facts. Our Chicago RLTO guide explains the broader framework.

Measure rooms consistently and preserve the original readings

The code specifies readings 3 feet above the floor and at least 3 feet from an exterior wall. See §14X-8-801.2. The city’s measurement guidance also calls for closed windows and exterior doors, with cooking appliances and portable heaters off.

Choose a thermometer suitable for room measurements and follow its instructions. Record its identity so later readings are comparable. A thermostat in a warm hallway may miss a cold bedroom. Check the reported room, then investigate other affected areas instead of replacing the complaint with a convenient hallway reading.

Keep the first reading even if a later reading improves. Note whether the heating system was operating and whether a contractor had already made adjustments. A photograph can support a reading, but it should show enough context to identify its location and time.

Use the printable log to capture:

Field	What to enter
Property and unit	Full address and consistent unit identifier
Date and time	Actual reading time, including a.m. or p.m.
Room and position	Room name and measurement location
Indoor temperature	Observed reading, not the thermostat setting
Conditions	Window and door status; equipment operating mode
Outdoor conditions	Reading and source when relevant to system changeover
Action	Person contacted, service order and next check
Observer	Name or initials of the person taking the reading

These fields are a suggested record format. The code does not prescribe this particular form or a universal logging interval. Increase follow-up when conditions are changing. A completed sheet is evidence of observations, not a certificate that every room complies.

Prepare the system before September 15

Build the seasonal service appointment into the property’s calendar. Leave time after the inspection for parts, access and a second visit. The owner’s deadline should account for unfinished work, not merely the day a contractor first looks at the equipment.

The current maintenance provision, §14X-8-801.3, requires proper operation consistent with the original design and safe, sanitary maintenance. Required safeguards must remain maintained. Its history includes a June 17, 2026 addition.

Give the contractor last season’s complaints before the appointment. Identify rooms that heated slowly, repeated shutdowns and repairs that only temporarily solved a problem. A vague request to “service the boiler” may omit the distribution problem residents actually experience.

Ask for a written report addressing the equipment and the building it serves. Useful questions include:

• Which units and rooms does this equipment serve?
• What tests and maintenance were completed under the manufacturer’s instructions?
• Were safety controls, venting and combustion-related components reviewed as applicable?
• Are there visible leaks, damaged components or unresolved operating faults?
• Does the distribution system reach the rooms that generated complaints?
• Are controls and schedules configured for this building’s obligations?
• Which repairs are urgent, and which need a planned follow-up?
• Does proposed replacement work require permits or another specialist?

These are questions for qualified trades, not directions for an owner to perform technical repairs. Chicago separately regulates safe mechanical equipment, vents, clearances and controls in §14X-8-804. Ask the contractor to identify the provisions relevant to the work.

Inspect the occupied space as well as the mechanical room. A damaged exterior door or a window that will not close deserves its own work order. Photograph the defect, assign responsibility and confirm completion. Do not close the entire heating project when only the furnace invoice arrives.

For major work, discuss the permit path before authorizing installation. Our Chicago permits and building code guide provides broader project context. Use the contractor and Department of Buildings for the requirements of the actual scope.

Use a clear emergency response sequence

Give residents a contact method that is monitored outside ordinary office hours. Test the forwarding or answering arrangement before cold weather. One missed call can become several hours of uncertainty when the owner believes the manager has already responded.

When a complaint arrives, record the time, unit, contact number and reported condition. Ask whether the problem affects one room, one apartment or the building. Establish whether there is an immediate safety issue. Chicago directs people to 911 for immediate danger and 311 for heat complaints in its reporting guidance.

Then run several tasks together:

1. Contact the service provider. Give the equipment details, symptoms, address and access contact. Obtain an arrival estimate without treating it as a guaranteed repair time.
2. Check the affected apartments. Arrange appropriate access, document readings and identify residents who need immediate practical help.
3. Explain the next update. Tell residents when they will hear from you again, even if the contractor has not yet diagnosed the fault.
4. Assess temporary arrangements. Consider safe accommodation or other assistance based on conditions while permanent repairs proceed.
5. Verify recovery. Check room temperatures after the work and continue follow-up until operation is stable.

Access needs its own care. For RLTO-covered units, §5-12-050 generally requires at least two days’ notice for entry. It has emergency and practical-necessity exceptions, followed by notice within two days of those entries. Do not label ordinary preventive maintenance an emergency to skip notice.

If a contractor discovers an unsafe condition, follow the professional’s safety directions and coordinate the resident response. Avoid promising that equipment will restart before the fault is assessed. The useful promise is when you will provide the next verified update.

Keep the work order open through the follow-up reading. “Technician left at 3 p.m.” records an event. It does not establish that the bedroom reached the required temperature or that the system continued running overnight.

Temporary heaters require separate safety planning

Portable heaters do not replace the permanent capacity the code requires. If temporary electric heaters are considered during repairs, assess whether they can be used safely in that apartment. Providing a box of heaters does not end the owner’s response.

The Consumer Product Safety Commission advises keeping portable heaters at least three feet from combustible materials. It also says to plug them directly into wall outlets, never extension cords or power strips. Follow the CPSC’s heater safety guidance and the manufacturer’s instructions.

Do not tell residents to heat the apartment with an oven. Discuss a safe alternative if temporary equipment is unsuitable. Record what was offered and agreed, while continuing the repair. Keep resident information limited to what the service team needs.

Send useful tenant updates without guessing

A practical first message might read:

We received your heat report at 7:40 a.m. The service company has accepted the call, and we are arranging access. We will update you by 9:00 a.m. with the arrival estimate and next steps. Please contact the emergency number in your building information if conditions change.

This is a sample communication, not a legal notice. Replace the times with facts. Add verified safety instructions appropriate to the situation. Do not announce a repair completion time simply because a contractor expects to arrive then.

After the service visit, distinguish diagnosis from completion. “The contractor identified a failed component and is locating the replacement” is more useful than “working on it.” Tell residents whether another visit is needed and who will arrange access.

For a building-wide issue, send a shared status update without exposing individual residents’ medical details or personal schedules. Handle accommodation needs directly. Keep copies of messages and call notes with the incident record.

Separate a heating credit from other accounting changes. Our Chicago security deposit and move-in fee guide explains why those balances need careful treatment. Planned rent changes also deserve their own process under Chicago rent increase notice rules.

Budget for repairs, replacement and resident assistance

A maintenance budget and a replacement reserve serve different purposes. Routine service can be anticipated annually. A major failure may require spending before the next month’s rent arrives. Keep enough liquidity to act while comparing reasonable repair options.

Here is a hypothetical planning example, not a Chicago price estimate or a contractor quote:

Planning item	Assumed amount
Annual inspection and planned service	$900
Annual allowance for smaller repairs	$1,200
Annual replacement-reserve contribution	$3,000
Separate emergency assistance reserve	$1,500

The first three items total $5,100 annually, or $425 monthly, for this imagined building. The additional $1,500 is a separate cash target. Replace every assumption with actual quotes, equipment history and the owner’s risk tolerance.

Suppose a current replacement proposal is $18,000 and the owner already holds $6,000 for that purpose. Funding the remaining $12,000 over four years requires $3,000 annually. That arithmetic explains the example’s contribution. It does not predict a four-year remaining equipment life or future installation cost.

Ask what a proposal includes: equipment, removal, controls, distribution repairs, permits and commissioning where applicable. A low equipment-only number may omit work needed for the building. Compare scopes before comparing totals.

Also check who can authorize urgent spending. If a manager must obtain approval above a modest amount, specify an emergency contact and backup. Our Chicago property management fee guide explains maintenance markups and contract questions that affect the owner’s actual cost.

Keep workspace and cooling rules separate

In a mixed-use building, the apartment schedule does not automatically govern the shop downstairs. §14X-8-802.3.2 generally requires 68°F in indoor occupiable workspaces during occupied periods in heat season. It includes specific exceptions, including certain work conditions and combined heating-and-cooling facilities. Review the commercial space separately.

Cooling is another code topic. For example, qualifying large or high-rise residential buildings have specific requirements under §14X-8-803.4. Review the building’s occupancy and applicable cooling provision separately. The heat-season dates do not establish a universal requirement to install air conditioning in every Chicago apartment.

For a voucher-assisted apartment, retain the same heating service records with the property file. Agency inspections and owner obligations also need attention. Our first-time Chicago Section 8 landlord guide explains that approval process. Passing an earlier inspection does not answer a new heating complaint.

Close each incident with a usable record

Save the complaint, original readings, access records, contractor report, invoices and resident communications together. Identify the completed repair and the person who verified recovery. If another visit is needed, give that task an owner and a date.

Review the incident after conditions are stable. Determine whether the cause was equipment failure, distribution, controls, building condition or an incomplete earlier repair. Update the next service appointment so the same complaint is not rediscovered in January.

The printable temperature log and checklist provides a starting point. Keep it with a current equipment inventory, reliable service contacts and enough repair funds to respond. Those ordinary operating habits make the heating rules easier to carry out when the weather turns.