Local Law 97 and Your Roof: How the Old Plant Comes Down and the Heat Pumps Go Up

Most of the talk about Local Law 97 is about emissions math. Very little of it is about the cooling tower that has to come off your roof before the new equipment can go up.

That part is ours. The Department of Buildings itself says the retrofits this law drives range “from replacements of old fossil fuel burning mechanical equipment” to better insulation. Swapping mechanical equipment on a New York building almost always means a crane, a rigging crew and two city agencies.

This guide is for the property manager, board member or owner’s rep whose engineer has already named the equipment. Here is how the lift works, who handles each piece, and when to book it so the pick does not hold up your NYC Local Law 97 plan.

What Local Law 97 is doing to NYC roofs

The basics first, straight from the Department of Buildings. Local Law 97 of 2019, part of the city’s Climate Mobilization Act, applies to most buildings in New York City larger than 25,000 gross square feet.

Those buildings have to meet greenhouse gas limits that get stricter over time, with a target of a 40 percent cut by 2030 and net zero by 2050. Miss the limit and the penalty is $268 for every ton of carbon over it.

The city has also stopped treating this as a future problem. In April 2026 DOB said about 93 percent of covered private properties had filed their first reports, and its Sustainability Bureau was auditing filings from roughly 28,000 buildings.

About 1,400 properties had not filed at all. They were being mailed Notices of Deficiency, and DOB’s lawyers were preparing cases at OATH, the city’s administrative court.

Reports for calendar year 2025 were due May 1, 2026, with a grace period to June 30 and an extension option to August 29. So the reporting side of Local Law 97 compliance is now an annual routine.

The equipment side is where the real work is. Filing a report does not lower a single ton. Swapping the equipment does, which is why LL97 keeps coming back to the roof.

On a lot of buildings, the change is up top. Cooling towers and chillers are being replaced by air to water heat pump modules, and some towers by dry coolers. Packaged rooftop units are going electric. VRF condensers are landing on roofs that never carried them.

That is what building electrification looks like from the roof. Something heavy comes down, and something heavy goes up.

The lift is two jobs, and the old plant comes down first

People budget for the install. They forget the removal. On most Local Law 97 swaps the haul-down is at least as much work as the set, and sometimes more.

A cooling tower replacement is the clearest example. The old tower has to be drained, disconnected, often cut into sections, rigged off its steel and lowered to a truck waiting on the street. Only then does the roof get prepped for what comes next.

Old equipment also rarely weighs what its original spec sheet says. Scale, sludge in a basin and decades of patches add weight nobody can look up. When nobody knows the real number, we plan conservatively and leave margin in the lift plan.

Chiller replacement follows the same pattern. Chiller removal from a rooftop is a crane pick. A chiller in a lower mechanical room might come out through the building on skates and dollies instead, which is rigging rather than a crane job.

Boiler removal is usually different again, because boilers tend to live in the cellar. That often means breaking the boiler down and taking it out through a sidewalk hatch, not over the roof.

If your rooftop HVAC change involves both a removal and a set, ask early whether they can happen on the same day. Often the roof needs new steel in between, and that pushes the set to a second visit.

A second visit means a second setup on the street, and often a second round of permits. Settle the sequence with your engineer before anyone books the crane.

What it weighs, and which number on the spec sheet matters

A spec sheet usually gives you three weights, and each one answers a different question. Shipping weight is what arrives on the truck, dry. Heaviest section is the biggest single piece when the unit ships in parts. Operating weight is the unit full of water and running.

Take a single cell Baltimore Aircoil Series 3000 tower, model S3E-8518-05L. It ships at 8,030 lb and weighs 15,170 lb in operation. The larger S3E-1222-14P ships at 17,150 lb in sections, the heaviest being 9,600 lb, and runs at 37,590 lb.

The crane is sized on the heaviest single pick at the distance it has to travel. The roof is checked against the operating weight, because that is what it carries every day for the next twenty years. Mix them up and either the crane or the roof steel ends up wrong.

The roof needs its own answer. A rooftop hvac unit or a bank of commercial heat pump modules rarely sits in the same footprint as what it replaces. New dunnage steel, curbs or reinforcement may be needed, and that is a call for your engineer or architect.

Then there is the license question. Under DOB rules, a Special Rigger can hoist materials and equipment weighing up to 2,000 pounds on the outside of a building. Anything heavier needs a Master Rigger.

Check every piece against that line on the spec sheet. Even the smaller tower above ships at four times it. For central plant work on a Local Law 97 job, plan on a master rigger from the start.

You may read online that two people with a pulley can pull a small condenser onto a roof. On a New York City building, hoisting equipment up the outside is licensed work, and a central plant is not a window condenser.

Who handles the crane lift on a building like yours

This is the question owners ask most, and the honest answer is that several parties share it. Each one owns a different piece.

The owner or manager hires the team, gets board approval and handles access and tenants. The engineer or architect designs the new system, checks the roof and files the alteration work with DOB.

The GC or mechanical contractor runs the swap: the equipment order, the disconnects, the piping and the electrical. They also coordinate the day the crane shows up.

The crane and rigging company handles the lift itself: the crane, a licensed DOB hoisting machine operator, the rigging crew, the street permits, the flaggers and the trucking. On anything over 2,000 pounds, the work runs under a licensed master rigger.

Rigging NYC Contractors works that last role. Our owner, Daniel Berkman, holds NYC Master Rigger license #214, so the supervision and the permit filing stay in house rather than being handed to another company.

When you compare crane services for a job like this, ask one thing first: does the hire include the operator, the rigging crew and the permits, or just the machine? Plenty of crane rigging services quote the machine and leave you to assemble the rest.

Rigging NYC quotes the whole lift as one job. One call covers the crane, the licensed operator, the crew, the DOB and DOT paperwork, certified flaggers and the trucks. You can read more about working with a licensed master rigger.

Crane, boom truck or another route

Not every Local Law 97 swap needs a big crane. What decides it is the weight of the heaviest pick, how far it has to reach from where the crane can set up, the height of the roof and what the street allows.

A mobile crane handles heavy central plant equipment on mid-rise and high-rise roofs. It needs street room for outriggers, and in Manhattan curb space is often the tightest thing on the job. Our mobile crane service page covers the setup.

A knuckle boom truck suits a lighter rooftop unit, smaller condensers and low buildings where the truck can get close. Boom truck rental is often the simpler answer when the weight and height allow it. See our boom trucks.

Inside the building is sometimes the right call. A VRF system (variable refrigerant flow) is often modular, and some pieces can ride a freight elevator or be rigged up a stairwell. That avoids the street, but only when the pieces fit.

Habitat magazine reported one Yorkville co-op that put six 30-ton heat pumps into its basement mechanical room this way. The modular units fit through the doorway and were bolted together in place, so the building never had to open a wall.

A single packaged rooftop unit, or RTU, on a low roof is often the simplest case. Plenty of crews just call these hvac lifts. Whatever the name, someone has to check the weight, the radius and the street before anyone picks a machine.

Those three things are also most of what drives the cost of a lift. A crane rental quote without a site visit is a guess, so we do not book a crane until we have looked at the roof, the street and the equipment list.

Two approvals, not one: DOB and DOT

A rooftop pick in New York usually needs two separate sign-offs, and getting one does not get you the other.

The Department of Buildings side depends on the machine and the lift, and crane approvals run through its Cranes and Derricks unit. For an articulating boom crane, for example, a certificate of on-site inspection is triggered by a load raised higher than 100 feet or a boom over 135 feet.

That certificate is filed by a New York State licensed professional engineer. Our guide to which crane permit a lift actually needs walks through every trigger.

The Department of Transportation side covers the street. If the crane, the outriggers or the truck sit in a lane or on a sidewalk, you need a DOT permit for that occupancy, and flaggers to manage traffic.

Here is the line that catches people. DOB says plainly that an exemption from its own permits does not exempt you from DOT or MTA requirements. A clean DOB file says nothing about the street.

The street also has a calendar. DOT’s Office of Construction Mitigation and Coordination suspends permits during embargoes for parades, major events and the winter holidays, which typically run from mid-November through January 2. Check our construction embargo calendar first.

When to book the pick if 2030 is your deadline

If 2030 is your Local Law 97 deadline, it feels far away. It is not, once you stack the clocks.

Design and engineering come first. Then board approval in a co-op or condo, which adds weeks. Then the equipment order, on the manufacturer’s lead time. Electrical service work with Con Edison runs on the utility’s own clock, alongside or behind.

Our side has its own timing. Allow two to three weeks for a DOB certificate of on-site inspection once the engineer’s work is ready, and one to four weeks for a DOT crane and boom occupancy permit. DOB publishes no guaranteed turnarounds, so treat those as planning numbers.

Then add the embargo windows on your street, and any after-hours work, which needs its own variance filed ahead of time.

One more thing changes the plan. Plenty of buildings will not electrify in a single shot. Habitat has written about a building that chose a hybrid route because roof space and electrical capacity ruled out going all electric at once.

A phased plan, with the cooling side now and the heating side later, means two or three separate lifts across several years. For a lot of buildings that is the sensible route to LL97 compliance.

Just plan the crane side once. The street, the setup spot and the roof path rarely change between phases, so later picks get easier if the first was well documented.

Book the lift when the equipment ship date is firm, not when it arrives. That is when the permits should start.

For the full list of what we ask before any job, see what to have ready before you book a crane lift.

Local Law 97 lift questions

What are the Local Law 97 requirements for my building?

If your building is larger than 25,000 gross square feet, it most likely has an annual emissions limit and a report due to DOB by May 1 each year. The limits tighten over time. Your engineer can tell you where you sit against your limit and what equipment would close the gap.

How much are Local Law 97 fines?

Local Law 97 penalties run $268 for every ton of carbon over the building’s limit, every year it is over. Not filing a report brings its own enforcement, and DOB has already sent Notices of Deficiency to buildings that missed the first reports.

Do I need a crane to replace a rooftop HVAC unit?

Usually, unless the unit breaks down small enough to go through the building. A light unit on a low roof might only need a boom truck. A heavy unit, or one far back from the street, needs an hvac crane sized for the heaviest pick at that distance.

How heavy is a rooftop unit?

There is no honest single number. Even one model has three weights: shipping, heaviest section and operating. One Baltimore Aircoil tower ships at 8,030 lb and runs at 15,170 lb full of water. Read the spec sheet for your model, and plan old equipment with margin.

Can a Special Rigger handle the lift?

Only if every piece weighs 2,000 pounds or less. That is the DOB limit for a Special Rigger. Anything heavier needs a Master Rigger. Cooling towers and most central plant pieces are well past that line, so check the spec sheet first.

Who pulls the permits for the crane?

On our jobs, we handle the DOB and DOT paperwork for the lift. Where a certificate of on-site inspection is needed, a licensed professional engineer files it. Your engineer or architect still files the building’s own alteration work.

How do I choose a crane company in NYC for this kind of job?

Ask whether the hire includes a licensed operator, the rigging crew, the permits and the flaggers, and who the master rigger is. Ask for a certificate of insurance before work starts. And be wary of any price given before someone has seen the roof and the street.

Plan the lift with the rest of the job

The equipment gets most of the attention in a Local Law 97 project, and fair enough. But the swap is not done until the old plant is off the roof and the new units sit level on their steel.

Rigging NYC handles that part across all five boroughs. For the bigger picture, see how we approach crane and rigging project planning.

Send us the spec sheets, the address and the window you are aiming at, and we will tell you how the lift should run.

Talk to us about your rooftop lift