AC condensers and mini-splits in the downtown (CBD) historic districts

Downtown’s four local historic districts are reviewed by the CBD Historic District Landmarks Commission, the HDLC’s downtown counterpart (HDLC FAQ). All four are full control, so AC equipment visible from the street needs a Certificate of Appropriateness. What changes downtown is the building. The district sheets describe buildings set “on the front property line,” often built up to the side lot lines and attached to their neighbors (Historic Districts, pages 02-5, 02-19, 02-27, 02-35). With no rear or side yard, the residential rules about yards don’t help. The commercial chapter is the one that applies.

Rules checked October 20, 2026, against the HDLC Design Guidelines. Canal Street was designated in 1984. Lafayette Square, Picayune Place, and the Warehouse District were designated in 1978, and Lafayette Square and the Warehouse District were expanded later.

Where the equipment goes

The commercial chapter says that where buildings fill their lots, “the opportunity to locate equipment in rear or side yards is not viable.” HVAC equipment then goes on a roof or in an energy vault at ground level, and “the equipment should be made as unobtrusive as possible” (Commercial Buildings, page 11-21). All visible exterior equipment, “including plumbing, irrigation systems and electrical connections,” needs a Certificate of Appropriateness.

On the roof, condensers are “not permitted where they are visually obtrusive from the public right of way” (Site Elements, page 10-8). On a four- to six-story Canal Street building, the street often can’t see much of a flat roof behind a parapet. The buildings next door can, but HDLC review is about the public right-of-way. A courtyard or light well is another option. The guidelines show courtyard equipment partly hidden by a fence, and suggest it would be better kept below the fence line.

Review level follows the building’s rating. Unobtrusive equipment is a staff approval for Contributing and Non-Contributing buildings and a Commission decision for Significant ones. Visually prominent equipment on a Significant or Contributing building is listed as “Commission appeal,” which in practice means staff won’t approve it (page 11-21).

Through-wall and window units

The commercial chapter is direct about these. The HDLC does not permit “installing through-wall air conditioners that are visible from the public right-of-way or removing windows to install air conditioner units.” It discourages window units in street-facing windows (page 11-11). A building that relies on window units today usually has two options: central equipment on the roof, or mini-splits with condensers on the roof or a rear wall.

Condos and lofts

Many downtown homes are condominiums in converted buildings. That adds a layer: the association usually controls the roof, and the CBD HDLC reviews what ends up on it. A new mini-split for one unit means a condenser location the association approves, a line route through common areas, and an application showing both. Line sets running down a street-facing wall are the exposed piping the guidelines say to minimize (page 10-9). Run them inside, or down a rear or light-well wall.

HVAC is on the New Orleans and CBD HDLC Express Lane. Work that meets the guidelines, with a complete application, can be approved in 1 to 3 business days. A complete application includes roof plans showing the equipment, spec sheets, and photos.

What the permit records show

Area	What the commission reviews	Parcels	HVAC permits	Mini-split share	Median days to issue
Canal Street	Full control	130	147	1.4%	Too few
Lafayette Square	Full control	303	299	7.7%	5 days
Picayune Place	Full control	88	69	Too few	Too few
Warehouse District	Full control	250	236	2.5%	12 days
The four CBD districts		771	751	4.7%	7 days
All HDLC full-control areas		12,075	3,282	9.0%	7 days
Outside every local historic district			14,583	2.9%	3 days

Areas on this page compared with the rest of the city. HVAC permits on every kind of building. Permits and mini-split share: applied for 2018 through October 17, 2026. Days to issue: median, applied for 2024 on. “Too few” means fewer than 100 permits (share) or 20 (days).

The table counts every kind of building, because only 21 of the four districts’ HVAC permits since 2018 were on one- or two-family houses. Across all buildings, mini-splits were 4.7% of permits, and permits applied for since 2024 were issued in a median of 7 days. Outside every historic district, the median was 3 days.

The French Quarter, across Canal Street, has its own commission and stricter rules. See the French Quarter page.