AC condensers and mini-splits in the Irish Channel and Lower Garden District

The Irish Channel and the Lower Garden District sit side by side along Jackson Avenue, and both are full-control HDLC districts. A condenser, mini-split, or line set visible from the street needs a Certificate of Appropriateness in either. The rules are the same. The houses differ: narrow-lot shotgun doubles and cottages in the Irish Channel, two-story and double-gallery houses in the Lower Garden District. Storefront buildings line both.

Rules checked October 20, 2026, against the HDLC Design Guidelines. The Lower Garden District was designated in 1975 and expanded in 1976. The Irish Channel was designated in 2002.

Irish Channel: narrow lots and doubles

HDLC’s district sheet says most Irish Channel lots are narrow, “with no space for offstreet parking,” and many houses have small front yards without fencing (Historic Districts, page 02-17). Single and double shotgun cottages are the common types. For AC:

The condenser goes in back. The HDLC requires a rear yard, or a side yard “when this is not possible,” and requires screening for any ground unit the street can see (Site Elements, page 10-9). With no front fence, a side-alley condenser usually needs a gate or a section of fence to hide it, and that fence is its own HDLC item.
Doubles mean two systems. A shotgun double usually has one system per side. Put both condensers together at the rear, with the lines run neatly, rather than one in each alley. That’s what the HDLC means by “rationally organized,” and it’s one screen instead of two.
Old window units come out. If a mini-split is replacing window units, the HDLC expects abandoned equipment removed and the wall repaired.

Lower Garden District: galleries

The Lower Garden District is “primarily composed of 2-story residential buildings,” mostly set back behind small front yards, and includes double gallery houses (page 02-21). The HDLC’s mini-split rule covers “equipment mounted on porches, galleries or balconies,” which must be “visually unobtrusive, and rationally organized” (page 10-9). The review table makes an unobtrusive wall unit a staff approval when it’s at least 10 feet back from the street-facing wall.

On a double-gallery house, both front galleries are the street face. A condenser on a side or rear gallery, or on the ground in back, is the path staff can approve. A unit on the front gallery isn’t. Lines from upstairs rooms are the hard part. Running them inside the wall or a rear chase keeps them off the side elevation. A tall line-set cover running down a two-story side wall is exactly the exposed piping the guidelines say to minimize.

Magazine Street and other storefronts

The Lower Garden District’s sheet notes that its commercial buildings are typically built to the front and side lot lines, with no setbacks. The HDLC’s commercial chapter applies to storefront buildings in both districts:

It does not permit “through-wall air conditioners that are visible from the public right-of-way,” or removing windows to install AC units.
It discourages window units in street-facing windows (Commercial Buildings, page 11-11).
Where there’s no yard, equipment goes on the roof or in a ground-level vault, “as unobtrusive as possible,” and visible equipment needs a Certificate of Appropriateness (page 11-21).

An apartment over a shop is a common place for a mini-split. Its condenser belongs on the roof or the rear wall, not the street front.

What the permit records show

Area	What the commission reviews	Parcels	HVAC permits	Mini-split share	Median days to issue
Irish Channel	Full control	1,914	314	3.5%	7 days
Lower Garden District	Full control	1,082	125	8.8%	3 days
Irish Channel and Lower Garden District		2,996	439	5.0%	6 days
All HDLC full-control areas		12,075	1,523	8.5%	7 days
Outside every local historic district			9,961	2.3%	3 days

Areas on this page compared with the rest of the city. HVAC permits on one- and two-family houses. 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 two districts don’t match on mini-splits. Since 2018 they were 8.8% of house HVAC permits in the Lower Garden District and 3.5% in the Irish Channel. The Irish Channel’s share is close to the citywide 2.3% outside the districts, despite full control. The rules alone don’t push owners toward ductless systems.

House permits applied for since 2024 had a median of 3 days from application to issue in the Lower Garden District and 7 days in the Irish Channel. Outside every district the median was 3 days. HVAC work that meets the guidelines qualifies for the HDLC’s Express Lane, with approvals in 1 to 3 business days on a complete application.

The Garden District, across Magazine Street from the Irish Channel, is reviewed far less. See Garden District.