AC in a New Orleans historic district: what gets reviewed, and how long it takes

New Orleans has three levels of historic-district review, and which one covers a house decides whether a new condenser or mini-split needs a design approval at all. In the French Quarter, the Vieux Carré Commission (VCC) reviews every exterior change, including ones nobody can see from the street. In the HDLC’s full-control districts, equipment and its piping are reviewed when they’re visible from a public way. In the partial-control districts, the HDLC reviews demolition, and an AC job doesn’t need its approval unless the building is an individual landmark.

None of that replaces the city’s mechanical permit or the zoning rules for where a condenser can sit, which apply everywhere.

Rules checked October 20, 2026, against the HDLC Design Guidelines (most chapters January 2019; Roofing May 2024) and the VCC Design Guidelines (August 2015). Permit figures are from city records through October 17, 2026.

Which kind of review covers your address

Where	Who reviews	What they review
French Quarter (Vieux Carré)	Vieux Carré Commission	All exterior work, “whether it is visible from the street or not,” including courtyards and roofs
Full-control HDLC districts	Historic District Landmarks Commission	Exterior work visible from a public right-of-way, including equipment and its connections
Partial-control HDLC districts	HDLC	Demolition (and new construction in the Garden District). Not AC work on an existing building
Individual landmarks, in any district	HDLC	All exterior work, visible or not
Everywhere else	No design review	Zoning and the mechanical permit only

The HDLC’s own definitions are in its Introduction, pages 01-3 to 01-4. Several districts are split. Tremé is full control between Rampart and Claiborne and partial control on the lake side. Esplanade Ridge and Carrollton are full control only along their avenues. The City’s historic district map shows the line for a specific lot. HDLC staff can confirm it at (504) 658-7040.

What full-control review asks of AC equipment

The HDLC’s rule for equipment is in the Site Elements chapter, pages 10-8 and 10-9. It covers “air conditioner compressor units” by name, and it counts the electrical and plumbing connections as part of the equipment. In plain terms:

• Ground units go in the rear yard. Owners “are required to locate ground-mounted equipment in a rear yard,” or a side yard when that isn’t possible, and any ground unit visible from the street has to be screened.
• Mini-splits are named. Ductless mini-split condensers and through-wall units “should be installed in a visually unobtrusive, and rationally organized manner.” That includes units on porches, galleries, and balconies.
• Wall units stay back from the front. The review table gives staff approval for unobtrusive wall-mounted equipment at least 10 feet back from the street-facing wall. A unit closer to the front, or one that’s visually prominent, goes to the Commission.
• Roof units have to be unobtrusive. Rooftop condensers are “not permitted where they are visually obtrusive.” On a pitched roof the HDLC encourages a spot at least 10 feet back from the front wall and 12 inches below the ridge (Roofing, page 05-10).
• Old equipment comes off. Abandoned equipment should be removed and the wall repaired.

Line sets and conduit

Neither commission’s guidelines use the words “line set” or “refrigerant.” Both cover the refrigerant lines and electrical whip under “piping” and “conduit”:

• HDLC: “exposed wall-mounted electrical conduit, piping, irrigation systems, meters and devices should be minimized” (page 10-9). On a full-control house, that usually means running the lines inside the wall, under the house, or up a rear or side wall out of view. Avoid a line-set cover down the street side.
• VCC: it does not allow “a visually obtrusive electrical device, wiring, conduit, piping or hardware at an exterior wall” (page 06-12). Its wiring guide asks for penetrations at a mortar joint and conduit painted to match (page 11-12). That guide was written for lighting and cameras, but it’s the closest the VCC comes to saying how a line set should run.

Whoever installs the system should draw the line-set route on the application. A clean route is often what decides whether a mini-split reads as “rationally organized.”

Who approves it, and how fast

In the HDLC districts, the review level depends on the building’s rating. A Significant building goes to the Commission. Unobtrusive equipment on a Contributing or Non-Contributing building can be approved by staff (page 10-9). HDLC staff can tell you a building’s rating.

HVAC is on the HDLC’s Express Lane list. Work that meets the guidelines, with a complete application, can get its Certificate of Appropriateness in 1 to 3 business days. A complete application includes site and roof plans showing where the equipment goes, spec sheets, and photos of the locations.

The French Quarter is slower and more formal. Its guidelines send a new condenser to the Architectural Committee or the full Commission, depending on the building’s color rating. The French Quarter page covers that.

The permit records show the difference. The table below counts days from application to issue on the city mechanical permit for one- and two-family houses. That’s the whole permit, so the design review is only part of the wait. The AC permit guide breaks the wait into its steps.

Reviewed by	HVAC permits	Mini-split share	Median days to issue	75th percentile days
Vieux Carré Commission	210	18.1%	18 days	65 days
HDLC, full control	1,523	8.5%	7 days	15 days
HDLC, partial control	4,216	5.2%	4 days	9 days
No district	9,961	2.3%	3 days	8 days

The median house permit outside every district was issued in 3 days. In full-control districts the median was 7 days, and in the French Quarter 18 days, with a quarter of French Quarter permits taking 65 days or more. Partial-control districts (4 days) look like the rest of the city, which fits the rule: the HDLC isn’t reviewing AC work there.

Where mini-splits are common

Mini-splits are far more common on permits inside the historic districts than outside them. That’s 6.5% of house HVAC permits in a district versus 2.3% elsewhere, since 2018. Among areas with at least 100 permits, the highest share is in the Vieux Carré (French Quarter) and the lowest in Mid-City. Permits don’t record why someone chose a mini-split. Two reasons fit these houses: many older houses have no room for ducts, and a small wall-mounted condenser is easier to keep out of view than a full-size one.

Area	What the commission reviews	Parcels	HVAC permits	Mini-split share	Median days to issue
Vieux Carré (French Quarter)	VCC: all exterior work	1,725	210	18.1%	18 days
Faubourg Marigny	Full control	1,649	188	12.2%	8 days
Bywater	Full control	2,208	317	9.1%	9 days
Tremé, Rampart to Claiborne	Full control	841	97	Too few	Too few
Tremé, lake side of Claiborne	Partial: demolition, plus non-binding comment	1,331	232	2.6%	4 days
Esplanade Ridge, Esplanade Avenue	Full control	255	25	Too few	Too few
Esplanade Ridge, off the avenue	Partial: demolition, plus non-binding comment	2,540	378	7.1%	4 days
Algiers Point	Full control	1,576	240	9.6%	7 days
Holy Cross	Full control	1,198	140	3.6%	8 days
Irish Channel	Full control	1,914	314	3.5%	7 days
Lower Garden District	Full control	1,082	125	8.8%	3 days
St. Charles Avenue	Full control	354	42	Too few	7 days
Garden District	Partial: new construction and demolition	1,029	164	9.8%	3 days
Uptown	Partial: demolition only	11,843	1,756	5.9%	3 days
Carrollton, off the avenue	Partial: demolition only	7,253	926	5.4%	5 days
Carrollton Avenue	Full control	227	14	Too few	Too few
Mid-City	Partial: demolition only	5,148	556	1.8%	4 days
Parkview	Partial: demolition only	1,481	204	3.4%	5 days
Canal Street	Full control	130	1	Too few	Too few
Lafayette Square	Full control	303	9	Too few	Too few
Picayune Place	Full control	88	1	Too few	Too few
Warehouse District	Full control	250	10	Too few	Too few
Outside every local historic district			9,961	2.3%	3 days

Permits are matched to districts through the City’s parcel layer. “Parcels” counts current parcels in each area. Shares count permits whose description names a mini-split or ductless system, so a permit that just says “HVAC” counts as something else.

Sources

1. City of New Orleans HDLC — Design Guidelines, Introduction (January 2019), pages 01-3 to 01-10
2. City of New Orleans HDLC — Guidelines for Site Elements, Equipment and Systems (January 2019), pages 10-8 to 10-9
3. City of New Orleans HDLC — Guidelines for Roofing (May 2024), pages 05-9 to 05-10
4. City of New Orleans HDLC — Express Lane
5. City of New Orleans — Vieux Carré Commission Design Guidelines (August 2015)
6. See Dat — City of New Orleans permit records and parcel layer, compiled by parcel

Related answers

• Local guideWhere can an AC condenser go on a New Orleans lot?
• Decision guideCentral air, mini-splits, or window units: what works in an old New Orleans house?
• Data guideWhat does a mini-split installation cost in New Orleans?
• Local dataHVAC permit explorer