Los Angeles County’s New Rental Housing Cooling Mandate: What Property Owners Need to Know
Los Angeles County has adopted a new rental housing requirement that could have significant implications for multifamily property owners, landlords and investors. The County’s Maximum Indoor Temperature Threshold Ordinance establishes an indoor temperature standard intended to protect tenants from excessive heat.
Under the ordinance, covered rental housing must be capable of maintaining a maximum indoor temperature of 82°F or below in habitable rooms.
While the ordinance became effective in 2025, the key enforcement date for most covered properties is January 1, 2027.
What Does the New Mandate Require?
The ordinance is important because it establishes a temperature standard rather than simply requiring air conditioning. It is also important to note that this applies to multifamily properties in unincorporated Los Angeles County, and any incorporated city that agrees to adopt the ordinance (As of this writing, no other cities have adopted the ordinance; however, Los Angeles City is moving toward adoption, and other cities are proposing similar rules).
Property owners may use a variety of methods to achieve compliance, depending on the building and circumstances. Potential solutions can include:
Air-conditioning systems
Heat pumps
Portable cooling equipment
Window-mounted air conditioners
Evaporative coolers
Window coverings and shading
Window films
Improved ventilation
Insulation and other passive cooling measures
The objective is for applicable habitable rooms to remain at or below 82°F.
This means a property without central air conditioning is not automatically out of compliance. The critical question is whether the property can maintain the required temperature through an appropriate, safe and code-compliant cooling strategy.
When Does the Requirement Take Effect?
For most covered rental properties, enforcement of the temperature requirement begins January 1, 2027.
There is a longer phase-in period for qualifying Small Property Landlords, (those that own in aggregate, less than ten (10) overall rental units).
For these owners:
January 1, 2027: At least one habitable room in each rental unit must meet the 82°F standard.
January 1, 2032: All habitable rooms must meet the standard.
The definition of a Small Property Landlord has specific ownership and unit-count requirements, so owners should verify whether they qualify rather than assuming that a small apartment building automatically receives the extended deadline.
Can Landlords Pass the Cost on to Tenants?
This is one of the most commonly asked questions from our clients, and an extremely important financial consideration.
The answer depends on the type of cooling improvement and whether the property is subject to Los Angeles County's rent stabilization rules.
The ordinance specifically provides that portable cooling devices used to satisfy the temperature requirement are not considered capital improvements and cannot be passed through to tenants in Fully Covered Rental Units under the County's Rent Stabilization and Tenant Protections Ordinance.
Larger, qualifying capital improvements may potentially be eligible for cost recovery under the County's existing rent-stabilization procedures. However, landlords generally must follow the applicable approval process before imposing a capital-improvement-related rent increase.
In practical terms, owners should not assume that the cost of installing air conditioning, purchasing portable units or making other cooling improvements can simply be added to the tenant's rent.
Owners should review the property's regulatory status and obtain appropriate legal or County guidance before attempting to recover these costs.
What Properties Are Exempt?
The ordinance does not apply to every residential rental situation.
Among the exclusions identified by the County are certain:
Owner-occupied rental arrangements where the landlord and tenant share the residence
Short-term rentals
Mobile homes and recreational vehicles
Mobile home and RV parks
Properties subject to routine habitability inspections by another governmental agency
Vacant properties
It is also important to distinguish between an exemption from the cooling ordinance and an exemption from rent stabilization. They are separate issues, and being exempt from one does not necessarily mean a property is exempt from the other.
Where Does the Ordinance Apply?
Another important consideration is geography.
Currently, the County ordinance automatically applies to covered rental properties located in unincorporated Los Angeles County.
It does not automatically apply to every city within Los Angeles County. Individual incorporated cities can adopt the requirements separately.
This creates an important due-diligence issue for multifamily owners with properties throughout Southern California. Two buildings located only a blocks apart could potentially be subject to different requirements depending upon their municipal jurisdiction.
What Does This Mean for Multifamily Investors?
The new requirement could create an additional capital expenditure consideration when buying or selling multifamily properties.
Investors should consider reviewing:
Existing HVAC and cooling systems
Units with historical heat complaints
Top-floor units
West- and south-facing units
Window condition and solar exposure
Roof and insulation condition
Electrical capacity for additional cooling equipment
Historical maintenance records
Potential HVAC or passive-cooling capital expenditures
The main focus for the investor’s consideration is not “Does the building have air conditioning?”, but rather: “Can the property reliably meet the applicable indoor-temperature requirement, and what will it cost to do so?”
That distinction will become increasingly important when evaluating older multifamily properties, and even top floor units vs. bottom floor units.
What Should Owners Do Now?
Although enforcement does not generally begin until 2027, owners should begin evaluating their properties now.
A practical approach is to:
Confirm the property's jurisdiction.
Determine whether the cooling ordinance applies.
Determine whether the property is subject to rent stabilization.
Inventory existing cooling systems.
Identify units that may be particularly susceptible to excessive heat.
Evaluate lower-cost passive cooling improvements.
Obtain preliminary HVAC or cooling estimates where necessary.
Review electrical capacity and building infrastructure.
Document tenant complaints, repairs and cooling improvements.
Incorporate potential cooling-related capital expenditures into future budgets and acquisition underwriting.
Pro-Tip: Install smart thermostats that can track and report temperatures remotely, taking out the “he said/She said” aspect of issues regarding temperature.
Will Other California Cities Follow?
There are already signs that indoor-temperature requirements could expand beyond the County's unincorporated areas. In February 2026, the Los Angeles City Council approved a motion directing the City to develop rules consistent with the County's 82°F rental-housing standard.
The County ordinance also allows incorporated cities to adopt similar requirements.
Whether other California cities ultimately adopt the same 82°F standard—or develop their own heat and habitability requirements—remains a local policy decision. However, the broader focus on extreme heat, tenant habitability and climate resilience suggests that cooling requirements are an issue multifamily owners should continue monitoring throughout California.
For investors, this could eventually make cooling infrastructure an increasingly relevant component of residential property due diligence.
The Bottom Line
Los Angeles County's new cooling mandate represents an important change for covered rental properties.
The requirement is not simply a mandate to install central air conditioning. Instead, covered properties must be capable of maintaining 82°F or below in applicable habitable rooms through an appropriate cooling solution.
With enforcement beginning in 2027 for most covered properties, multifamily owners have an opportunity to evaluate their buildings, estimate potential capital costs and address problem areas before enforcement begins.
For buyers and sellers, the new rule is another reason to make HVAC, building-envelope conditions, tenant complaints and potential cooling-related capital expenditures part of the multifamily due-diligence process.
If you’d like more information regarding your investment(s) and how to best position your investments to insulate against unexpected costs, please reach out to us at info@cbicommercial.com, for a no obligation consultation.
This article is for general informational purposes only and is not legal advice. Property owners should verify current requirements with Los Angeles County or the applicable municipality and consult qualified California housing counsel regarding specific properties.