Indoor Air Quality & Ventilation
A lot of New York apartments have a humidity or odour problem that no amount of cleaning fixes, because the real issue is that air has nowhere to go.
Older apartment buildings were built to leak air, and then they were sealed up with replacement windows and weatherstripping without anyone adding a way to ventilate. The result is familiar: a bathroom that stays damp for hours, condensation on windows in winter, cooking smells that linger for days, and mold appearing in the same corner every year.
We work on the mechanical side of that — bath and kitchen exhaust fans, ductwork and terminations, makeup air issues, filtration on systems that have it, and humidity problems that are really ventilation problems. A surprisingly common find is an exhaust fan that runs but is connected to nothing, or ducted into a wall cavity rather than outside.
Two honest boundaries. First, if there's visible mold beyond a small surface area, that's remediation work and belongs to a specialist — we can address the moisture source, but we don't do abatement. Second, in an apartment building, shafts and building-wide exhaust systems are usually the building's responsibility, so if your bathroom fan is tied into a common shaft that isn't drawing, the fix runs through your managing agent.
When this is likely your problem
What's included — and what isn't
Included in the quote
- Assessment of existing exhaust — whether it runs, and whether it actually terminates outside
- Exhaust fan replacement and duct correction
- Kitchen exhaust and range hood ventilation work
- Filtration assessment and filter specification on systems that accept it
- Humidity diagnosis, including identifying the moisture source
- Airflow verification after the work
Quoted separately
- Mold testing, remediation, and abatement, which are a specialist trade
- Electrical work beyond connecting to an existing suitable circuit
- Building-wide exhaust shafts and common ventilation systems
- Facade penetrations and exterior terminations requiring building approval
- Window replacement and building envelope work
- Air quality laboratory testing and certification
What drives the price
We quote after diagnosis, not before. These are the factors that move the number most on this particular service:
- EXISTINGWhether there's a working duct route or one has to be created.
- TERMINATIONWhere the air can actually be discharged, which is often the hard constraint.
- SCOPEA fan swap versus correcting a duct that was never connected properly.
- BUILDINGWhether the exhaust ties into a common shaft you don't control.
- ELECTRICALWhether existing wiring supports the replacement unit.
NYC note
In many apartment buildings the bathroom exhaust connects to a common shaft rather than to its own exterior vent. If that shaft isn't drawing properly, no fan replacement inside your unit will fix it — the problem is building infrastructure and goes through your managing agent. We'll test and tell you which situation you're in, because it determines who can actually solve it.
Related services
What the visit involves
Test what's there
We check whether the existing fan actually moves air and where that air goes.
Find the moisture source
Humidity complaints often trace to a specific source rather than general dampness.
Correct the path
Fan, duct, and termination — a fan discharging into a wall cavity isn't ventilation.
Verify airflow
Measured after the work, not assumed because the fan is louder.
Questions about indoor air quality & ventilation
My bathroom fan runs but the room stays steamy. Why?
The most common causes are a duct that's disconnected, crushed, or terminating inside a wall or ceiling cavity rather than outside; a fan that's badly undersized for the room; or, in an apartment, a common exhaust shaft that isn't drawing. A running fan is not the same as a working ventilation path, and testing tells them apart quickly.
Do you handle mold?
We address the moisture source — the ventilation or plumbing problem creating the conditions. Testing and remediation of mold itself is a specialist trade with its own licensing, and for anything beyond a small surface patch you want that specialist. We'll say plainly when what you're describing is beyond our scope.
Will an air purifier solve my problem?
It depends on the problem. Portable filtration can help with particulates and some odours. It does nothing for humidity, and it doesn't replace ventilation — it recirculates the same air more cleanly. If your issue is dampness or lingering cooking smells, exhaust is the actual fix and a purifier is a distraction from it.
Why does my apartment get condensation on the windows in winter?
Usually because indoor humidity is high relative to the cold glass surface. In a tight apartment with limited ventilation, moisture from showering, cooking, and simply breathing has nowhere to go. Better exhaust in bathroom and kitchen is normally the first thing to address, before anyone talks about the windows themselves.
Can you vent a kitchen hood to the outside?
Sometimes, but it depends entirely on the building. An exterior termination generally needs building approval and may face facade restrictions, and many apartments have no viable route. Where outside venting isn't possible, a recirculating hood with proper filtration is the realistic option — we'll tell you which applies to your kitchen rather than promising a duct that can't be run.
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.