Cal. Civ. Code § 20
Heating and cooling standards
Operative Text
Heating and cooling standards. (a) When residential rental property has a cooling system or heating system or both serving the entire premises, including individual dwelling units, the landlord shall comply with the following standards with respect to the individual dwelling units in which tenants live: (1) During the cooling season, June 1 through September 30, cooling systems must operate when the heat index exceeds 80 degrees Fahrenheit.(2) During the heating season, October 1 through May 31: (i) between 6 a.m. and 10 p.m., heat must register at least 68 degrees Fahrenheit when the outside temperature falls below 55 degrees Fahrenheit, and (ii) between 10 p.m. and 6 a.m., heat must register at least 62 degrees Fahrenheit.(b) When residential rental property does not have a premises-wide cooling system that serves individual dwelling units, then the landlord shall provide at least one indoor common gathering space for which a cooling system operates when the heat index exceeds 80 degrees Fahrenheit. All tenants of the residential rental property shall have free access to that cooled space. As used in this subsection, "indoor common gathering space" means a room intended to be used as a place where multiple people can gather, such as a lounge, meeting or conference room, party room, or similar that can accommodate a cooling system. Residential rental property that does not have an indoor common gathering space shall be exempt from this subsection. (c) This Section only applies to residential rental property in which rental or occupancy is limited to persons 55 years of age or older.
Under 765 Ill. Comp. Stat. 705 § 20, landlords of qualifying residential rental properties — those restricted to residents aged 55 and older — must maintain specific temperature standards in individual dwelling units when a building-wide system exists. During the cooling season (June 1–September 30), cooling must activate when the heat index tops 80°F; during the heating season (October 1–May 31), indoor temperatures must reach at least 68°F during daytime hours and 62°F overnight. When no building-wide cooling system serves individual units, the landlord must instead provide a free-access, air-conditioned indoor common gathering space during high-heat conditions, unless no such space exists on the property.
Plain English — not legal advice.
Operators of age-restricted residential rental properties (55 and older) covered by 765 Ill. Comp. Stat. 705 § 20 generally maintain documented records of system operation, thermostat readings, and heat-index conditions throughout both the cooling season (June 1–September 30) and the heating season (October 1–May 31). Where a building-wide cooling system serves individual units, compliant operators ensure the system activates whenever the heat index exceeds 80°F and that heating meets the daytime (68°F) and overnight (62°F) minimums. Where no such building-wide cooling system exists, compliant operators identify and designate an accessible indoor common gathering space with functioning cooling and ensure all tenants can use it at no charge during qualifying heat conditions.
General guidance for property managers — not legal advice for your specific situation. Consult an attorney for advice on your case.
Residents of age-restricted rental communities (55 and older) have enforceable temperature rights under 765 Ill. Comp. Stat. 705 § 20, including the right to adequate cooling during summer heat events and minimum heat levels throughout the colder months. If a landlord fails to meet these standards — whether by not running the cooling system when the heat index exceeds 80°F, not maintaining required heating temperatures, or failing to provide a cooled common space where applicable — tenants may document the conditions (e.g., dated temperature readings and heat-index records) as evidence of a potential violation. General enforcement paths can include raising the violation in a housing court proceeding, contacting a local housing authority or code enforcement office, or reaching out to a tenant-rights organization familiar with Illinois housing law.
General guidance for tenants — not legal advice for your specific situation. Consult a tenant-rights organization or attorney for advice on your case.
Generated September 18, 2026 — auto-generated, not yet human-reviewed. See /transparency for methodology.
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