Air conditioning in a rental: what a landlord owes you, and what you can install

Updated September 6, 2026 · Claude AC · 3 sources cited

Contents (8)

Heat is a legal duty almost everywhere. Cooling usually is not.
The cities that put a number on it
If the unit came with the apartment, it is the landlord's to fix
What a renter can actually install
The rules that bite before the thermodynamics do
The electrical trap in older buildings
When cooling simply is not available
Frequently asked questions

Roughly a third of American households rent, and almost none of them get to choose the cooling equipment they live with. That produces questions homeowners never face: whether the landlord must fix the dead condenser, whether a window unit violates the lease, and what happens to any of it at move-out. The answers are unusually local — cooling law in the United States is written city by city rather than nationally — but the structure of the problem is the same everywhere.

Heat is a legal duty almost everywhere. Cooling usually is not.

Nearly every state recognizes an implied warranty of habitability: a landlord must deliver a dwelling that is fit to live in, and heat in winter is the textbook example. Air conditioning is generally not on that list. The habitability statutes were written when cooling was a luxury, and most of them still treat it as an amenity rather than a necessity — which is why a broken furnace in January and a broken air conditioner in July can carry very different legal weight in the same building.

That default is not the end of the analysis, because a duty to cool can arrive by three other routes:

A local ordinance that puts a number on indoor temperature. A small but growing list of cities and counties has adopted maximum indoor temperature rules for rental housing since the heat waves of the 2020s. Where one exists it is the strongest tool a tenant has, because code inspectors enforce it rather than a lawsuit.
The lease or the listing. If the unit was advertised with air conditioning or the lease mentions it, the equipment is part of what you are paying for — in most states a contractual obligation regardless of what the habitability statute says about cooling in the abstract.
State "essential services" law. A few hot-climate states treat landlord-supplied cooling as an essential service, with a specific notice-and-remedy procedure attached. Arizona is the most-cited example.

The cities that put a number on it

Two long-standing ordinances show what an enforceable cooling rule looks like in practice. Both are worth reading in full if you live under them, and both are worth quoting in a complaint.

Jurisdiction	What the rule requires	Practical note
Phoenix, Arizona (City Code Ch. 39-5)	Where a rental is cooled, habitable rooms must be held at or below 82 °F with refrigerated air, or 86 °F with evaporative cooling	Measured three feet above the floor at the center of the room; the cooling must come from permanently installed equipment, so a portable unit you were handed does not satisfy it
Dallas, Texas (city ordinance, in force since 2017)	Rental air conditioning must hold each habitable room at least 15 °F below the outdoor temperature, and no higher than 85 °F	Code compliance treats AC complaints as a life-safety priority in extreme heat, with short deadlines and daily penalties

Neither number is a comfort target — 85 °F indoors is survivable, not pleasant. They are floors below which a building is legally defective. And they change: several jurisdictions have amended or added rules in the last few years, so confirm the current text with the city rather than with a summary like this one. Nothing here is legal advice; a tenants' rights clinic or the state attorney general's consumer division will know your jurisdiction far better than a national article can.

If the unit came with the apartment, it is the landlord's to fix

This is the single most useful distinction in the whole subject. Equipment supplied with the tenancy — a through-wall sleeve unit, a central system, a mini-split the owner installed — is the landlord's asset and, in almost every lease, the landlord's repair responsibility. Equipment you bought and carried in is yours, including when it fails.

What makes a repair request work is documentation rather than volume. Put it in writing, dated, by whatever method the lease specifies for notices. Photograph a thermometer in the middle of the room once or twice a day with the time visible, because a temperature log is what an inspector or a judge can act on. Call code compliance if your city has a rule: it costs nothing and creates an official record independent of you. And be careful with self-help — repair-and-deduct and rent withholding exist in many states but under strict procedural conditions, and getting them wrong hands the landlord grounds for eviction.

One split of duties is nearly universal and worth honoring: routine filter changes are the tenant's job under most leases, and a system that fails because filters were never changed becomes an argument you will lose. A failed capacitor or compressor is a different matter — our guide to a system that runs but will not cool will help you describe the fault precisely enough that the landlord's contractor cannot wave it away.

What a renter can actually install

Assume you are on your own and buying something. Five options, ranked by how much of the building they need:

Option	What it needs from the building	Landlord consent	Comes with you	Indicative equipment cost
Window unit	A sash window of the right type; often a bracket	Usually needed in writing; often barred on street-facing façades	Yes	$150–$700
Portable unit	Any window or opening for the exhaust hose	Rarely refused — nothing is altered	Yes	$300–$800
Through-wall sleeve unit	An existing sleeve; a new one is construction	Owner's decision if the sleeve does not exist	No, if the sleeve is the building's	$400–$900
Ductless mini-split	A wall penetration, a condenser spot, a circuit	Written owner approval; an improvement to their property	No	$3,000–$7,000 installed
Evaporative cooler	Dry outdoor air and an opening for air to leave	None, but only viable in the arid West	Yes	$150–$600

These are indicative market bands, not quotes, and they move with region and season. For most renters the real decision is the first two rows, and it is not close on performance: a window unit rejects its heat outdoors, while a single-hose portable rejects heat through a hose in the room and depressurizes the apartment doing it. Our comparison of window units and portables works through the pressure mechanics. Where a landlord will consider permanent equipment, the mini-split section covers what that involves.

The rules that bite before the thermodynamics do

Renters lose more window-unit plans to paperwork than to physics. Mounting and façade rules come first: New York City is the strictest widely cited case, with brackets required above the first floor and unsafely mounted units becoming a building violation under the façade inspection regime, and most co-op and condo boards have their own version. Window type comes second — casement and crank windows cannot take a standard unit, which is the single most common reason a renter ends up with a portable. Then the lease itself, where "no alterations" clauses and outright bans on window units are common; a ban discovered after the machine arrives is an expensive way to read a lease. Finally, restoration: any hole, bracket or bolt is something you may be asked to make good, so get the permission and the restoration expectation in the same written message, and state plainly who owns the machine when the tenancy ends.

If you do get a yes, install it properly rather than quickly — a unit that is not tilted correctly drains condensate into the room or onto the wall below, and our guide to installing a window air conditioner covers the tilt, the seal and the bracket question.

The electrical trap in older buildings

Apartment bedroom circuits are typically 15 amps at 120 volts, shared with lighting and outlets in adjacent rooms. A mid-size window unit around 12,000 BTU draws roughly 1,100 to 1,400 watts, or about 10 to 12 amps — most of the circuit on its own. Two consequences follow. Manufacturers prohibit extension cords for these machines, and the prohibition is a fire-safety one rather than a warranty formality: the supplied cord carries a leakage-current protection device in the plug, and a generic cord or power strip defeats it. And if the breaker trips whenever the compressor starts, the cause is usually circuit loading rather than a faulty machine — in a rental that is worth reporting in writing, because it is the landlord's wiring.

Who pays for the electricity shapes the rules as well. In an individually metered apartment you pay for what you run, and the arithmetic in our guide to what an air conditioner costs to run applies directly. In a master-metered building the cost is spread across every tenant through the rent, which is why some owners of such buildings write window-unit bans into the lease in the first place.

When cooling simply is not available

Sometimes the equipment is broken, the landlord is slow and the forecast is not. Extreme heat is the deadliest weather hazard in the United States in a typical year, and the public-health advice is unglamorous and effective: use a cooling center, spend the hottest hours in an air-conditioned public building, keep blinds closed on sun-facing windows, ventilate hard once the outdoor temperature drops below the indoor one, and check on neighbors who are elderly or on medications that impair heat tolerance. A fan alone stops helping once air temperature approaches body temperature — at that point it is moving hot air over skin rather than cooling it.

Frequently asked questions

Does my landlord have to provide air conditioning?

In most of the United States, no — habitability law guarantees heat, not cooling. The exceptions matter: a city ordinance setting a maximum indoor temperature, a lease or listing that promised air conditioning, or a state that classifies landlord-supplied cooling as an essential service. Check your city code first, then your lease.

The AC that came with the apartment broke. Who fixes it?

The landlord, in nearly all cases, because the equipment is theirs and it was part of the bargain. Give written notice, keep a dated temperature log, and file a code complaint if your city has a cooling rule. Repair-and-deduct rules vary widely by state and misusing them creates eviction risk, so take advice before withholding rent.

Can my landlord ban window air conditioners?

Yes, and many do, usually through a no-alterations clause, a façade or bracket rule, or a master-metered electricity arrangement. Ask in writing before buying. If the answer is no, a dual-hose portable is the fallback that requires no permission, at a real cost in efficiency and noise.

Can I install a mini-split in a rental?

Only with the owner's written consent, because it means drilling through the wall, mounting a condenser and usually adding a circuit. Once installed it is a fixture and normally becomes the landlord's property, so negotiate the cost split before the work, not after — some owners will contribute or amortize it against rent, since it improves an asset they keep.