HVAC Services in Westchester County, NY

Whether you need a no-heat call diagnosed, a seasonal tune-up, a new ductless system for a room that never stays comfortable, or a full replacement planned around a renovation, our team handles the work with clear communication, written scopes and documentation you can keep.

HVAC repair

Diagnosis and repair of no-cool, no-heat, short-cycling, leaking and noisy systems. We find the root cause and explain the fix before we start.

HVAC maintenance

Seasonal tune-ups for cooling and heating equipment: coil and drain cleaning, filter changes, electrical and refrigerant checks, and combustion safety checks on fuel-burning equipment.

HVAC installation and replacement

Properly sized new systems with load calculations, clean installation and full startup documentation, whether you are replacing an aging system or adding air conditioning for the first time.

Ductless mini-splits and VRF

Ductless systems for homes without ductwork, additions, attics and basements, and VRF systems for larger homes and commercial spaces that need zoned comfort.

Heat pumps

Cold-climate heat pumps that provide efficient heating and cooling from one system, including hybrid setups that work alongside an existing boiler or furnace.

Boilers and furnaces

Repair, maintenance and replacement of hot-water and steam boilers and gas or oil furnaces, the systems that heat a large share of homes in the region.

HVAC design and consulting

Engineering-led system design for renovations, new construction and complex properties, with clear drawings and equipment selections before work begins.

1. Request. Call (800) 699-8632 or submit a service request with your address, system type and the problem you are seeing. Photos of the equipment label help.
2. Diagnosis. A technician inspects the system, tests the electrical, airflow, refrigerant or combustion side as needed, and identifies the root cause rather than just the symptom.
3. Written scope. You get a clear explanation of what we found, the recommended repair or replacement, and the options, before any additional work starts.
4. The work. We protect floors and finishes, keep the work area tidy and test the system fully once the work is complete.
5. Documentation. You receive a record of what was done, readings taken and any follow-up recommendations, which is useful for warranties and future service.

Westchester winters bring long stretches of freezing weather, and many homes still rely on boilers or furnaces that are decades old. A fall heating check, including combustion and safety testing on oil and gas equipment, is the best way to avoid a mid-January breakdown. If your system is near the end of its life, autumn is also the right time to compare a like-for-like replacement with a cold-climate heat pump or hybrid system.

Summers are warm and humid, and larger suburban homes often have second floors and attics that run hotter than the rest of the house. Spring cooling maintenance, clean coils and clear condensate drains help central systems keep up, while ductless mini-splits are an effective way to fix hot upstairs bedrooms, home offices and additions without new ductwork.

Shoulder seasons are a good window for planned projects. Scheduling installations in spring or fall means less disruption, and it gives you time to review options rather than making a rushed decision during a heat wave or cold snap.

• Licensed & insured
• Mitsubishi Electric Diamond Contractor
• LG Pro Dealer (LG HVAC Authorized Dealer)
• Samsung HVAC Preferred Dealer
• See our Google reviews

Many Westchester homeowners come to us after renovations, additions or a change in how they use their home, such as a converted attic or a new home office. We look at the whole property, including insulation, duct condition and electrical capacity, so the system we recommend fits the house rather than just the equipment it replaces.

Does Dezier Air provide HVAC service in Westchester County?

Yes. Dezier Air serves homes and buildings in communities across Westchester County, along with all five New York City boroughs and Rockland County. Call (800) 699-8632 or submit a service request with your address so we can confirm scheduling for your location.

What HVAC systems do you work on?

We service and install central air systems, ductless mini-splits, VRF systems, heat pumps, boilers, furnaces, ventilation equipment and indoor air quality products for residential and light commercial properties.

Can you replace an oil or gas boiler with a heat pump?

Often, yes, but it depends on the home’s heat loss, existing distribution (radiators, baseboard or ducts) and electrical capacity. We assess the property and give you a written scope that explains whether a full heat pump conversion, a hybrid setup or a boiler replacement makes the most sense.

How often should my system be maintained?

We recommend a cooling tune-up in spring and a heating tune-up in fall. Regular maintenance catches worn parts, clogged drains and refrigerant or combustion issues before they turn into breakdowns during the hottest or coldest weeks of the year.

Do you install ductless mini-splits in homes without ductwork?

Yes. Ductless mini-splits are a common choice for older homes, additions, finished basements and rooms that are hard to heat or cool. We size each indoor unit to the room and plan line-set routing to keep the installation clean.

Are you licensed and insured?

Yes. Dezier Air is licensed and insured, and we are a Mitsubishi Electric Diamond Contractor, LG Pro Dealer and Samsung HVAC Preferred Dealer.

What should I include when I request service?

Include your address, the type of system and where it is located, any error codes on the thermostat or unit, access notes, and photos of the equipment label if you can. This helps us send the right technician with the right parts.

How does pricing work?

Service visits and consultations are billed. We confirm scope, access and next steps before dispatch, and for installations we provide a written proposal before any work begins.

Call (800) 699-8632 or request service online and tell us about your system. We serve communities across Westchester County, all five NYC boroughs and the wider region.

Dezier Air
24-57 49th Street, Astoria, NY 11103
(800) 699-8632 · team@dezierair.com
Mon–Fri 7:30 AM–5:00 PM · Sat–Sun 9:00 AM–5:00 PM