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AC condensers and mini-splits in the St. Charles Avenue historic district

Researched

The St. Charles Avenue historic district is a strip one lot deep. It covers the properties fronting the avenue from Jackson to Carrollton, and they’re under full HDLC control (Historic Districts, page 02-29). Most of the blocks behind it are in the Garden District, Uptown, or Carrollton districts, where the HDLC controls only demolition, and new construction in the Garden District. On the avenue, a condenser visible from the street needs a Certificate of Appropriateness. On the house directly behind it, facing a side street, it may not.

Rules checked October 20, 2026, against the HDLC Design Guidelines. The district was designated in 1976 and expanded in 2017.

Big houses on big lots

The district sheet describes “large-scale residential construction 2-stories in height,” on large lots with “comparatively large front yards edged with iron fences.” Most are wood frame. That makes the HDLC’s first choice practical:

  • Rear yard. The HDLC requires ground units in the rear yard, or a side yard when that isn’t possible, and requires screening for anything visible from the street (Site Elements, page 10-9). An open iron fence doesn’t screen anything, so a side-yard unit needs plantings or a solid screen behind the fence line.
  • Corner lots. A corner property’s side yard faces a street. City zoning bans ground equipment in a corner side yard (CZO 21.6.T), and the HDLC would see it anyway.
  • Galleries. Mini-split condensers on galleries and balconies fall under the same rule as wall units. They must be “visually unobtrusive, and rationally organized,” and staff can approve one at least 10 feet back from the street-facing wall (page 10-9). On a double-galleried house, that rules out the front galleries.

Apartment buildings and roofs

The district includes early 20th-century apartment buildings, and most of its HVAC permits are on buildings other than one- and two-family houses. With one condenser per apartment, there can be more equipment than a yard can hold, and some of it can end up on the roof. The HDLC doesn’t allow rooftop condensers “where they are visually obtrusive from the public right of way” (page 10-8). On a pitched roof, it encourages placing equipment at least 10 feet back from the front wall and 12 inches below the ridge (Roofing, page 05-10). Its review table gives staff approval to unobtrusive roof equipment on Contributing and Non-Contributing buildings, and sends Significant buildings to the Commission. Line sets running down from the roof count as exposed piping, which “should be minimized.” Group them, and run them down a rear wall.

Replacing a whole building’s condensers at once is a chance to clean up decades of piecemeal additions: abandoned units, dead line sets, and stray conduit. The guidelines ask for abandoned equipment to be removed and the wall repaired.

What the permit records show

AreaWhat the commission reviewsParcelsHVAC permitsMini-split shareMedian days to issue
St. Charles AvenueFull control3541679.0%6 days
All HDLC full-control areas12,0753,2829.0%7 days
Outside every local historic district14,5832.9%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 permits on every kind of building, because only 42 of the avenue’s HVAC permits since 2018 were on one- or two-family houses. That’s too few for a house-only share. Across all buildings, the district had 167 HVAC permits, and 9.0% were mini-splits. Permits applied for since 2024 were issued in a median of 6 days, against 3 days outside every district.

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. For the partial-control blocks behind the avenue, see Garden District and Uptown, Carrollton, Mid-City and Parkview.

Sources

  1. City of New Orleans HDLC — Historic Districts, St. Charles Avenue district sheet (January 2019), page 02-29
  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), page 05-10
  4. City of New Orleans Comprehensive Zoning Ordinance — Article 21, Sec. 21.6.T Mechanical Equipment
  5. See Dat — City of New Orleans permit records and parcel layer, compiled by parcel