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Central air, mini-splits, or window units: what works in an old New Orleans house?

Use the ducts you already have, the rooms that stay hot, your budget, and how much work the house can take to narrow the choices.

Researched

Central air, mini-split, or window unit Three cooling options side by side. Central air cools the whole house through ducts and registers, with a typical life span of 15–20 years. A ductless mini-split uses wall-mounted heads to cool zones without ductwork, typically 12–15 years. A window unit cools one room at a time, typically 10–15 years. Central air Cools the whole house through ducts and registers Typical life span 15–20 years Ductless mini-split Wall-mounted heads cool zones without ductwork Typical life span 12–15 years Window unit Cools one room at a time Typical life span 10–15 years

The three ways most New Orleans houses get cooled, at a glance. Which one fits depends on the house — ductwork, wiring, and how many rooms actually need cooling.

Source: U.S. DOE — Energy Saver 101, Home Cooling infographic, accessed 2026-10-16

If the ducts already reach every room and are worth keeping, central air is usually the cleanest choice. If the ducts are missing, crushed, leaky, or cannot reach an addition, mini-splits may fit better. A window unit can make sense for one room, a temporary need, or a smaller budget. Some old houses need a mix.

The equipment brand is not the first decision. Start with which rooms stay hot, what happens when doors close, and whether the existing ducts can actually do the job.

Start with the rooms that are not comfortable

Write down which rooms run hot or clammy and when it happens. Note any addition, upstairs room, closed bedroom, or back room that the current system struggles to reach. That short list is more useful than guessing from total square footage.

Have each contractor explain how the proposed system will serve those rooms. If one quote assumes the existing ducts are fine and another replaces half of them, the quotes are not comparing the same job.

Central air works when the ducts are worth keeping

Central air makes sense when the ducts reach the whole house, have enough return air, and can be sealed and insulated without rebuilding half the place. It keeps most of the equipment out of the rooms and runs from one main control.

Bad ducts can make new equipment feel like the same old problem. Weak returns, pinched runs, attic heat, and leakage can leave bedrooms hot even after the outdoor unit is replaced. Ask how the contractor checked airflow and duct condition before accepting the old tonnage. Those checks are part of ENERGY STAR’s quality-installation guidance.

Mini-splits work when ducts do not

Mini-splits can serve an addition, an upstairs area, a few rooms, or a house with no practical duct route. They also let different parts of the house run at different settings.

One wall unit does not automatically cool through closed doors or down a long shotgun layout. Ask which unit serves each room, where the drain goes, and where the visible lines will run. ENERGY STAR’s ductless guide is a useful overview of the system type, but the room layout still decides whether it fits.

Window units work one room at a time

A window unit can be a good answer for a bedroom, a rental, an outage plan, or a house where permanent work is not in the budget yet. It is not a whole-house plan unless everyone is comfortable living room by room.

Match it to the room, not the whole house. Sun, ceiling height, kitchen heat, and the number of people in the room all change the load. A unit that is too large can cool fast and leave the room damp. See ENERGY STAR’s room AC sizing guide, then follow the exact unit’s support, drainage, and electrical instructions.

Humidity still matters

Central air, mini-splits, and window units can all leave a house clammy when they are oversized, cycle too quickly, move the wrong amount of air, or drain poorly. None of the three wins just because it has the highest efficiency number.

Ask how the system handles mild, humid days, not only the hottest afternoon. For central air, that means sizing, airflow, stages, and ducts. For mini-splits, it means how low each zone can turn down. For window units, it means avoiding an oversized unit in a small room.

Make every quote answer the same questions

Before comparing price, make sure each quote says:

  • which rooms the system is meant to cool;
  • whether existing ducts stay, change, or go away;
  • where indoor units, outdoor units, drains, and visible lines will sit;
  • what electrical work is included;
  • how the installer will check airflow, drainage, controls, and cooling after startup;
  • what is excluded.

New Orleans requires a mechanical permit for covered AC installation and replacement work. Ask who is pulling and closing it; the City keeps the current process on its mechanical permit page. If the property is in a historic district, ask early whether an outdoor unit or visible lines need separate approval. That is a contractor question, not a homework assignment for the homeowner.

Energy Smart’s 2026 form includes some qualifying central and mini-split replacements, subject to eligibility and available funds. Check the live rebate form before counting it in the price.

Sources

  1. ENERGY STAR — Ductless Heating and Cooling, accessed 8/11/2026
  2. ENERGY STAR — Room Air Conditioners, accessed 8/11/2026
  3. ENERGY STAR — HVAC Quality Installation, accessed 8/11/2026
  4. City of New Orleans — Mechanical Permit, accessed 8/11/2026
  5. Energy Smart — 2026 AC Replacement Rebate Form, accessed 8/11/2026

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