Ductless Mini-Split Installation
Most New York apartments have no ductwork and never will. A mini-split is how you get real cooling and heating into a space that can't accept a duct system.
A ductless mini-split pairs an outdoor condenser with one or more indoor units, connected by a small refrigerant line set rather than ducts. For pre-war apartments, brownstone floors, converted lofts, and rear additions, it's frequently the only practical way to get modern heating and cooling without tearing the place apart.
The advantages are real: room-by-room control, quiet operation, no ducts to lose energy through, and — with a heat pump unit — heating as well as cooling, which can supplement a tired radiator system in a room that never gets warm enough.
The constraints are also real, and they're where honest advice matters. You need somewhere to put a condenser, a path for the line set, a condensate drain route, and adequate electrical capacity. In a co-op or condo, exterior equipment almost always needs board approval, and in a landmarked building anything visible from the street may face additional restrictions. We assess all of that before quoting rather than after you've bought equipment.
When this is likely your problem
What's included — and what isn't
Included in the quote
- Site assessment — condenser location, line set route, drain path, and electrical capacity
- Load calculation to size the indoor units to each room
- Installation of indoor heads, outdoor condenser, and line set
- Condensate drain routing
- Startup, commissioning, and a walkthrough of controls and filter cleaning
Quoted separately
- The equipment itself
- Electrical circuits, panel upgrades, and disconnects, which are an electrician's scope
- Board approval applications, architect drawings, and filing fees
- Facade penetration repair, waterproofing, and masonry restoration
- Structural support or brackets for condenser mounting where custom work is needed
- Interior finish repair along the line set route
What drives the price
We quote after diagnosis, not before. These are the factors that move the number most on this particular service:
- HEADSHow many indoor units, and whether a single or multi-zone condenser is needed.
- ROUTELine set distance and how easily it can be concealed or run externally.
- CONDENSERTerrace, roof, air shaft, or bracket mount — access drives cost significantly.
- ELECTRICALWhether existing panel capacity supports the system.
- APPROVALSBoard consent, drawings, and landmark restrictions where applicable.
NYC note
This is the service where building approval matters most. Exterior condensers almost always need board consent, often supported by drawings, and landmarked buildings restrict anything visible from the street. Some buildings prohibit facade penetrations entirely. Start the approval conversation with your managing agent before you commit to equipment — we'll tell you what we think you'll need, but they set the rules.
Related services
What the visit involves
Assess feasibility honestly
Condenser location and line route decide whether this is straightforward or difficult.
Size per room
Each head is sized to its room's load. Oversized heads short-cycle and feel clammy.
Sort approvals before ordering
We'll tell you what your building is likely to require so equipment isn't bought prematurely.
Install and commission
Heads, condenser, line set, and drains, then verified operation and a controls walkthrough.
Questions about ductless mini-split installation
Will a mini-split heat as well as cool?
Heat pump models do both, and modern cold-climate units hold usable capacity well into low outdoor temperatures. In a New York apartment they're often used to supplement rather than replace existing heat — particularly in a room the radiators never quite reach. Whether it can be your only heat source depends on the unit, the space, and your building's requirements.
Do I need my co-op board's approval?
For anything with an outdoor condenser, almost certainly yes, and often with drawings. Buildings vary widely: some have a standard process, some restrict facade penetrations entirely, and landmarked buildings add another layer. Start that conversation early, because it takes longer than the installation does.
How disruptive is the installation?
Less than most people expect. The line set needs a route between the indoor head and the condenser, which means one small penetration and either a concealed run or an exterior line cover. There's no ductwork and no wall opening beyond the penetration and mounting points. Most single-head installations are a day or so.
Is one big head better than several small ones?
No. A single oversized head cools its own room aggressively and does little for the rest of the apartment, and oversizing causes short-cycling and poor humidity control. Multi-zone systems with correctly sized heads per room perform better, though they cost more upfront.
How much maintenance do they need?
Mostly cleaning the indoor filters regularly, which you can do yourself, plus a periodic professional cleaning of the indoor coil and blower wheel. Neglected indoor units develop odour and lose capacity, and that cleaning is more involved than a filter rinse.
Ready to get this looked at?
Call and describe what's happening. You'll get an honest read on urgency and cost before anyone comes out.