How Applied Comfort Fits Odd Sleeves and Boiler Coils

Published October 20, 2026 by New York PTACs, powered by Air Distributors Company, Inc.

Most PTAC makers build one sleeve size and expect your wall to match. Applied Comfort builds to the wall. For a New York building with odd sleeves, a boiler, and a board that will not approve facade work, that difference decides whether a dead unit takes an afternoon or a construction project.

The New York problem

When a legacy unit fails, the owner's choices are thin. The original maker is gone or no longer builds the size. A 42 x 16 unit does not fit. Rebuilding the opening means masonry, a permit, new louvers, and in a tower a swing stage hanging off the facade. In a co-op it also means a board vote. In a landmarked building it means a Landmarks Preservation Commission permit for a new louver.

Applied Comfort builds chassis in sleeve families that match those older openings. The new unit slides in, connects to the existing power or piping, and nothing outside changes.

Sleeve families

Each family covers a group of older units with similar dimensions. Examples, several of which turn up across the New York metro:

32 inch sleeves, from some Zoneaire, Keeprite, and older Islandaire models
36 inch sleeves, from some Zoneaire, Climate Master, and older Islandaire models
44 inch sleeves, from some McQuay, Singer, Remington, and older Islandaire models
Three-piece K installations from Singer, Remington, and McQuay
Series 16 style sleeves from AAF and McQuay
42 x 16 sleeves with hot water coils, in slope-top, flat-top, top-coil, and bottom-coil versions

Islandaire is a Long Island manufacturer, so its older units are more common here than almost anywhere. A brand name alone does not guarantee a fit, though. Dimensions decide. Send the measurements and old model number, and the match is confirmed before you order.

Four things the chassis has to match

Sleeve dimensions

Width, height, depth, and top shape. The chassis slides in with the right clearance and seals against the sleeve. Deep masonry walls in older buildings are part of the measurement.

Airflow through the louver

The condenser pulls air in through the outdoor louver and pushes it back out. The chassis layout follows the louver pattern of the original sleeve family, so the existing louver stays. That is what keeps the street view unchanged.

Heat connection

Electric and heat pump units connect to the existing circuit. Hydronic units put the hot water coil in the original position, top or bottom, so the building's supply and return lines connect without new piping.

Electrical and controls

The chassis is built for the building's voltage, 208/230V or 265V. Select series accept a 24V remote wall thermostat.

Hydronic heat in New York buildings

Many New York co-ops, rental towers, and older hotels from the 1950s through the 1980s heat from a central boiler. The through-the-wall unit cools with its own compressor and heats with a coil on the boiler loop.

Swapping those for electric PTACs moves heat onto each apartment's circuit. That raises electric demand, can force electrical upgrades, and changes who pays for heat. A hydronic replacement avoids all three, and the owner keeps control of heat through the October-to-May season the city requires.

A typical New York example

A 1968 co-op in Queens has 180 through-the-wall units on 44 inch sleeves, heated by hot water from the boiler. The original maker no longer builds the unit. Five failed last winter, and the super has been pulling parts from the worst units to keep the rest alive.

The managing agent measures one sleeve per line, photographs a nameplate, and sends both with heat source and quantity. The replacement is a hydronic chassis built to the 44 inch sleeve, coil connections in the original position. The board approves eight units now, covering failures plus two spares, then the rest line by line over three years. No louver changes, so there is nothing for the board's architect to review on the facade. No apartment loses heat for longer than a chassis swap.

Built to order

Order before the season you need them. January and July are the worst months to wait.
Keep spares in the basement if the building has many units of one legacy size.
Confirm the full quantity up front on multi-unit jobs so the order builds in one run.

Some series get redesigned between production runs. If yours is between runs, the quote says when to expect it.

When to convert instead

Convert to 42 x 16 only when the sleeves are rusted through or out of square, the building is being gutted, or the whole building is leaving boiler heat. See standard vs. legacy PTAC sizes.

What to measure and send

Inside sleeve width, height, and depth, to the nearest quarter inch
Top shape, flat or sloped
Old brand and model number
Voltage, amperage, plug-in or hardwired
Heat source, and coil position for hydronic units
Quantity

The replacement guide covers each measurement. Then see Applied Comfort units, request a quote, or call 800-866-1210.