Brooklyn's HVAC challenge: five different worlds in one borough
Drive thirty minutes through Brooklyn and you will pass five completely different building types — each with its own HVAC quirks, retrofit options, and regulatory constraints. The system that is perfect for a Bay Ridge ranch will fail in a Williamsburg loft. Here is how we approach each one.
1. Brownstones (Park Slope, Carroll Gardens, Cobble Hill, Brooklyn Heights)
Pre-war row houses with original radiator heat, three to four floors, and zero ductwork. Most owners want central air without losing ceiling height. Our typical solution: ductless mini-splits per floor, with the condenser tucked into the rear garden or mounted to a brick wall on a low-noise bracket. For owners doing a full gut renovation, we have installed compact high-velocity ducted systems through framed soffits — but it is only worth the cost if walls are already open.
2. Walk-up apartment buildings (Williamsburg, Bushwick, Greenpoint, Crown Heights)
Four- to six-story buildings, often a hundred years old, with shared steam risers and individual gas hookups. Ductwork is rarely possible. The two real options are ductless mini-splits (best for owners) and PTAC sleeve replacements (best for landlords doing per-unit upgrades). We have also installed roof-mounted heat pumps with refrigerant lines down to individual units when the building owner agrees to a coordinated upgrade.
3. Co-ops and condos (Brooklyn Heights, DUMBO, Fort Greene, Park Slope)
These are the slowest jobs because the board owns the timeline. We provide stamped drawings, equipment data sheets, and a contractor-of-record letter — the package most boards require for approval. Common installs: PTAC replacements for existing sleeves, ductless mini-splits where allowed, or central system tie-ins where the building has a rooftop chiller. For DUMBO conversions we have done custom variable-flow systems through exposed-ceiling lofts.
4. Single-family homes (Bay Ridge, Bensonhurst, Sheepshead Bay, Mill Basin, Marine Park)
South Brooklyn's most conventional installs — basement-mounted forced-air furnaces, ducted central AC, and exterior condensers on side yards. These are the homes where heat pump conversions make the most sense: existing ductwork can be reused, and Con Edison rebates plus federal tax credits often cover 40-50% of the upgrade cost. We are seeing more of these every quarter as customers chase lower bills and Local Law 97 readiness.
5. Industrial conversions (DUMBO waterfront, Gowanus, Williamsburg)
Open-plan lofts in former factory buildings — twelve-foot ceilings, exposed mechanical, and a need for distributed cooling without ducts. We design these as VRV/VRF systems with concealed ceiling cassettes or wall-mounted units, sized for the solar gain through the oversized windows that came standard in 1920s loft buildings.
