Lynbrook HVAC Company handles heating and cooling for homes, rental properties, and commercial buildings across Lynbrook and Nassau County. Whether the call is for a furnace that stopped working in January, a central air system that needs replacing before summer, or a commercial rooftop unit that is running rough, we scope the job on the phone and get it scheduled. Residential HVAC. Commercial HVAC. One number for both.
Call (363) 999-8289 for a quote.
Heating and cooling a home right takes the right tools and a methodical approach, and the range of work we cover reflects that. On the heating side, we handle furnace repair and service, boiler repair and replacement, heat pump repair and installation, and full HVAC system installation and replacement. On the cooling side, that means central air repair, central air installation, air handler and blower service, and heat pump cooling. We also install and configure thermostats and smart controls, repair and seal ductwork, address indoor air quality, and schedule seasonal maintenance for both residential and commercial systems.
The diagnosis is explained on every call before any work is authorized, so you know what the problem is and what the fix involves before anything gets scheduled. We'll get the repair scoped and scheduled.
A furnace that stops turning on at midnight or an air conditioner that quits on the hottest day of the year is not a problem that waits well. We take emergency calls every day from 8:30 AM to 10:00 PM. That covers emergency furnace repair, including a furnace blowing cold air or a furnace that will not turn on at all. It covers emergency AC repair when the system stops cooling or starts blowing warm air. It covers heat pump failures in both heating and cooling mode, and any situation where the HVAC system is simply down and the building is uncomfortable or unsafe.
When you call, describe what the system is doing and when it started. That information helps scope the visit before anyone is dispatched. We'll take the details and get it scheduled.
Choosing the right HVAC fix is easier than it sounds, once the symptoms are read correctly. A refrigerant leak shows up as an AC that runs constantly but never cools the space down to the set temperature. Uneven temperatures from room to room usually point to airflow problems: a blocked duct, a dirty blower wheel, or a damper that has closed off. Condenser and compressor service matters when the outdoor unit is short-cycling, making noise, or failing to start. Evaporator coil cleaning is often the answer when airflow is weak and the system is icing up.
Thermostat faults are easy to overlook because the equipment looks fine. A thermostat that is reading the wrong temperature, failing to hold a schedule, or simply not communicating with the air handler can make a perfectly functional system behave as though it is broken. We diagnose thermostat problems and install replacements, including smart thermostat upgrades that give better control over comfort and energy use.
The system is tested before the visit ends, so the repair is confirmed rather than assumed. We'll explain the diagnosis before any work is authorized.
A quick tune-up and a full system swap are two different jobs, and a replacement starts with understanding what the building actually needs. We handle new HVAC system installation and full system replacement for both residential and commercial properties. That includes central air installation, heat pump installation, and air handler replacement. When a system is being replaced, it is also a natural point to address energy-efficiency upgrades, zoning systems, and comfort-control configurations that were not possible with the old equipment.
Pricing is straightforward: call for a quote, and the price is confirmed before anything is scheduled. HVAC installation and replacement costs vary based on the size of the space, the equipment selected, and what the existing setup requires. We go through all of that on the call so there are no open questions when the visit is booked. Call us and we'll walk you through your options.
Making comfort simple is most of what the job is, and a seasonal tune-up is the most direct way to keep a system running the way it should. A fall heating tune-up covers airflow checks, heat exchanger inspection, burner cleaning, blower service, and thermostat calibration. A spring AC tune-up covers refrigerant level verification, coil inspection, condensate drain clearing, and a full operational check before the cooling season starts.
Maintenance matters as much for rental properties and commercial buildings as it does for a single-family home. A landlord managing multiple units benefits from catching problems before a tenant calls. A property manager with a commercial building benefits from documented service visits and systems that are not failing mid-season. We schedule both one-time tune-ups and recurring seasonal service, and the scope of each visit is confirmed on the call.
Nassau County's summers are humid, and the winters are cold and dry. Both ends of that range create indoor air quality challenges. In summer, excess humidity promotes mold growth and makes air conditioning work harder. In winter, dry air causes discomfort and can damage wood floors, furniture, and woodwork. We install whole-home humidifiers and dehumidifiers that work with the HVAC system to hold the indoor environment at a consistent level year-round.
Beyond humidity, we handle whole-home air filtration and air purifier installation for homes and commercial spaces where dust, allergens, or airborne particles are a concern. Commercial rooftop units are covered as well as residential, so a property manager dealing with air quality issues in a commercial building has the same options available. We'll explain the diagnosis before any work is authorized.
You shouldn't have to chase a contractor for answers about why one room is always too warm or too cold. Uneven temperatures from one room to the next, higher-than-expected energy bills, and dusty air coming from the registers are all symptoms that point to the duct system. Leaking ducts allow conditioned air to escape into unconditioned spaces like attics and crawlspaces before it reaches the rooms it is supposed to serve.
We handle duct repair, ductwork sealing, and full duct replacement when the existing layout is too far gone to seal effectively. Sealing a leaky duct system improves both comfort and efficiency without replacing any of the heating or cooling equipment itself. We'll get the repair scoped and scheduled.
Residential homeowners, landlords, and commercial property managers all call us for the same core reason: a heating or cooling system that is not doing its job. For homeowners, that might be a furnace repair or a new central air installation. For landlords managing rental properties in Nassau County, it is often a unit that has failed between tenants and needs a fast turnaround. For commercial property managers, it is frequently a rooftop unit repair or replacement, commercial AC repair, or commercial heating service for a building that cannot afford downtime.
We cover commercial HVAC repair, commercial HVAC installation, and rooftop unit repair and replacement alongside all of our residential work. Heating checked. Cooling checked. Airflow measured.
Work in this area gets sized for the climate it actually runs in. Nassau County's winters are cold enough to stress any heating system, the summers are humid enough to push air conditioning hard, and a large share of the housing stock was built before central air was standard. That combination drives a specific set of service needs that come up regularly in Lynbrook and the towns around it.
Many homes in Lynbrook and across Nassau County were built with boiler-based heating systems, and a significant number of them still run on steam or hot-water radiators. Boiler repair involves pressure checks, zone valve inspection, circulator pump service, and bleeding and balancing the system so heat reaches every room evenly. When a boiler is at the end of its service life, we handle full boiler replacement and new boiler installation, sized for the building and the existing distribution system.
The Northeast carries the overwhelming majority of the country's oil-heat homes, and Nassau County is no exception. Many properties here still run on oil-fired systems that are expensive to operate and due for replacement. Converting to a gas-fired system or a heat pump reduces operating costs and removes the need for on-site fuel storage. On the HVAC side, that means swapping the heating unit, installing a new air handler or heat pump system, and connecting to the existing duct system or configuring a new one. The gas-line run itself is plumbing work and handled separately. We speak to the equipment and the air side.
Older homes in Lynbrook often have no ductwork at all, and adding a full ducted system is not always practical or cost-effective. A ductless mini-split handles heating and cooling for a single room or a defined zone without requiring any duct runs. Installation involves placing the indoor air handler, running the refrigerant line set to the outdoor condenser, and configuring the controls. Mini-splits are also a common solution for room additions, converted garages, and finished attics where extending existing ductwork is difficult. We handle mini-split repair and replacement as well as new installation.
We serve Lynbrook and the communities around it throughout Nassau County, including Rockville Center, Valley Stream, Malverne, Baldwin, Hewlett, and East Rockaway. If you are nearby and need heating or cooling work, call and we will confirm coverage for your address on the phone. We are open every day from 8:30 AM to 10:00 PM. We'll take the details and get it scheduled.
A boiler service visit covers operating pressure, zone valve condition, circulator pump function, and a check of the heat exchanger and safety controls. We also bleed radiators that are not heating evenly and verify that the system is distributing heat to all zones. The boiler is run through a full cycle before the visit ends to confirm the repair or service held. If the system is past the point where repair makes sense, we explain the replacement options and what new equipment would involve.
An air conditioner that runs continuously without reaching the set temperature, cycles on and off in short bursts, or produces weak airflow at the registers is showing signs of a system under stress. Ice forming on the evaporator coil, refrigerant leaks, or a condenser that makes unusual noise during operation are all worth a diagnostic visit before the problem gets worse. A unit that requires repeated repairs or is running on a refrigerant that is no longer readily available is a candidate for replacement rather than another fix. We go through the options on the call and explain what each one involves.
On the HVAC side, a conversion means removing the existing oil-fired unit, installing the new heating equipment, and assessing the existing ductwork to confirm it can handle the new system's airflow requirements. For a heat pump conversion, the outdoor unit and the air handler are both replaced, and the refrigerant line set is run between them. The gas-line run to the new unit is plumbing work handled separately. We speak to the equipment and the air side of the job, and we explain what the ductwork assessment involves before the visit is booked.
A mini-split installation involves mounting the indoor air handler on the wall or ceiling of the space being conditioned, running the refrigerant line set through the wall to the outdoor condenser, and configuring the zone controls. One outdoor unit can serve multiple indoor heads, which makes it practical for a whole floor, a room addition, or a converted attic. We confirm the equipment sizing and the installation scope on the call before anything is scheduled. The system is tested before the visit ends to confirm heating and cooling are working correctly.
At the outdoor unit, the visit covers refrigerant pressure, coil condition, fan motor operation, and electrical connections at the disconnect. For a heat pump, the defrost cycle and reversing valve operation are also checked, since heat pump failures in heating mode often trace back to one of those components. The outdoor unit is run under load and the readings are compared against the manufacturer's specifications. Findings are explained before any repair work is authorized.
A clogged filter restricts airflow through the air handler, which forces the blower to work harder and reduces the volume of conditioned air reaching the living space. Over time, that restriction also causes the evaporator coil to run colder than it should, which can lead to icing and reduced system efficiency. Leaking or dirty ductwork compounds the problem by allowing dust and particles to enter the air stream between the filter and the registers. We inspect ductwork and airflow as part of a diagnostic visit when comfort or air quality complaints point in that direction.
The decision depends on the age and condition of the existing equipment, the cost of the repair relative to the cost of a replacement, and what the property's heating and cooling needs actually are. A heat pump handles both heating and cooling from a single system, which makes it a practical choice when either the furnace or the air conditioner is due for replacement. We go through the specifics on the call: what the repair involves, what a heat pump installation would require, and what the difference in scope and cost looks like. The goal is a decision that fits the property, not a default recommendation.
Clear a path to the equipment that needs service: the furnace or air handler, the outdoor condenser, and any registers or return-air grilles the technician may need to check. For attic or crawlspace equipment, make sure the access point is unobstructed. If the visit involves ductwork, let us know on the call where the main trunk lines run so we can confirm access. Anything fragile or in the way of the work area should be moved before the visit starts.
Someone needs to be present to provide access to the equipment and to hear the findings before any work is authorized. The diagnosis is explained in person before the repair begins, and the price is confirmed before parts are ordered or work proceeds. If the property is a rental and the owner will not be present, the person on-site needs to be able to authorize the work. Let us know the situation on the call and we will confirm what is needed before the visit is booked.
A fall heating tune-up covers airflow checks, heat exchanger inspection, burner cleaning, blower service, and thermostat calibration. A spring AC tune-up covers refrigerant level verification, coil inspection, condensate drain clearing, and a full operational check. Every component on the checklist is inspected, not just the ones that are obviously causing a problem. The system is run through a full cycle before the visit ends to confirm everything is operating within normal parameters.
An inspection makes sense before a property changes hands, when a system has not been serviced in more than a year, or when energy bills have increased without a clear explanation. It is also worth scheduling when a home has been unoccupied for an extended period and the system's condition is unknown. An inspection covers the same checklist as a tune-up and produces a clear picture of what the system needs before the next heating or cooling season puts it under load. We explain what the inspection covers and confirm the price on the call.
A thermostat replacement starts with confirming compatibility between the new control and the existing heating and cooling equipment. Wiring varies between systems, and a smart thermostat that works with a heat pump requires different wiring than one connected to a gas furnace. We handle the wiring, mount the new control, and walk through the programming before the visit ends so the system is set up correctly from day one. If the existing thermostat wiring is causing a communication fault with the equipment, we diagnose and repair that as part of the same visit.
Lynbrook HVAC Company covers residential and commercial heating and cooling from a single repair call through full system replacement, and emergency calls are taken every day. The diagnosis is explained on every call before any work is authorized, and the price is confirmed before anything is scheduled.
Call (363) 999-8289 for a quote.
Heating and cooling cover a wide range of jobs, and the right starting point is knowing what the work actually involves. The table below lays out what each service covers, who it fits best, and one practical detail worth knowing before you call. Every price is confirmed on the phone before anything is scheduled, and the diagnosis is explained before any work is authorized.
| Service Type | What the Service Includes | Common Needs | Things to Know |
|---|---|---|---|
| Full System Installation & ReplacementMost Popular |
| A system that is past the point where repair makes sense, or a property upgrading from window units to central air | A large share of Nassau County's housing stock was built before central air was standard, so duct layout and equipment sizing vary significantly from one property to the next. |
| Heat Pump Repair & Service |
| A heat pump that is losing output in heating or cooling mode, or switching modes incorrectly | Heat pump failures in heating mode often trace back to the reversing valve or defrost controls rather than the compressor itself. |
| Boiler & Hydronic Heating Service |
| Homes in Lynbrook and Nassau County running on steam or hot-water radiator systems | Many properties in this area were built with boiler-based heating and are still running on the original distribution system. Boiler replacement is also available when repair is no longer practical. |
| AC Repair & Service |
| A system that is running but not cooling the space down to the set temperature | Short-cycling and weak airflow often trace back to different causes, so a diagnostic visit is the right first step before any parts are quoted. |
| Indoor Air Quality & Air Filtration |
| Homes dealing with excess summer humidity, dry winter air, or airborne dust and allergen concerns | Nassau County summers are humid enough to promote mold growth inside the system if moisture is not managed. Winter dryness creates a separate set of comfort and damage concerns. |
| Ductwork Repair & Sealing |
| Uneven room temperatures, higher-than-expected energy bills, or dusty air at the registers | Leaking ducts allow conditioned air to escape into attics and crawlspaces before it reaches the living space. Sealing them improves comfort without replacing any heating or cooling equipment. |
| Thermostat & Smart-Control Installation |
| A system behaving erratically, or a homeowner wanting better control over comfort and energy use | A smart thermostat wired to a heat pump requires different connections than one on a gas furnace. We confirm compatibility before installation begins. |
| Heating & Furnace Repair |
| A furnace blowing cold air, failing to start, or cycling on and off without reaching the set temperature | Nassau County winters put heating systems under sustained load, so a furnace showing intermittent problems in fall is worth diagnosing before the coldest weeks arrive. |
| Ductless Mini-Split Installation |
| Older homes with no ductwork, room additions, converted garages, or finished attics | One outdoor unit can serve multiple indoor heads, making a mini-split practical for conditioning an entire floor or several separate zones without running new ductwork. |
| Emergency HVAC Service |
| A heating or cooling system that has stopped working and the building is uncomfortable or unsafe | We take emergency calls every day from 8:30 AM to 10:00 PM. Describing what the system is doing when you call helps scope the visit before anyone is dispatched. |
| Seasonal Maintenance & Tune-Ups |
| Homeowners, landlords, and commercial property managers who want to catch problems before a breakdown | A fall tune-up covers the heating side. A spring tune-up covers the cooling side. Both end with the system run through a full cycle to confirm it is operating within normal parameters. |
| Oil-to-Gas & Heat Pump Conversion |
| Properties still running on oil-fired systems that are due for replacement or becoming expensive to operate | The Northeast carries the largest share of oil-heat homes in the country, and Nassau County reflects that. We handle the equipment and air side. The gas-line run to the unit is plumbing work handled separately. |
How often should a heating or cooling system be serviced?
Once a year for each side is the standard. A fall tune-up gets the heating system ready before the cold sets in, and a spring tune-up gets the cooling system ready before the first hot stretch. Systems that run year-round, like heat pumps, benefit from both. Skipping a season does not guarantee a breakdown, but it does mean small problems that would have been caught during a service visit have more time to develop into larger ones.
What does it mean when a system short-cycles?
Short-cycling is when the system turns on, runs for a brief period, shuts off, and then repeats the cycle without ever reaching the set temperature. It puts extra wear on the compressor and blower because startup draws more current than steady operation. The cause varies: an oversized system, a refrigerant charge that is off, a dirty evaporator coil, or a failing pressure switch can all produce the same symptom. A diagnostic visit identifies which one applies before any repair is quoted.
What are the signs of a refrigerant or airflow problem?
A refrigerant problem typically shows up as an AC that runs continuously without cooling the space to the set temperature, or ice forming on the evaporator coil. An airflow problem shows up differently: weak output at the registers, uneven temperatures from room to room, or a blower that sounds like it is working harder than usual. Both can produce similar comfort complaints, which is why a diagnostic visit that checks refrigerant pressure and airflow separately is the right starting point.
Diagnosis Explained Before Any Repair
We go through what the system is doing, what is causing it, and what the repair involves before any work is authorized. You know what the problem is and what the fix costs before anything proceeds.
Why is one room always hotter or colder than the rest of the house?
Uneven temperatures usually point to the duct system rather than the heating or cooling equipment itself. A blocked duct, a damper that has closed off, or a section of ductwork that is leaking conditioned air into an unconditioned space before it reaches the room can all produce the same result. In older homes with boiler-based heating, a zone valve that is not opening fully or a radiator that needs bleeding can cause the same symptom on the heating side. We check both the equipment and the distribution system when uneven comfort is the complaint.
What do strange noises from an HVAC unit usually mean?
A rattling sound at the outdoor unit often points to debris in the condenser or a loose panel. A grinding or squealing noise from the air handler usually means the blower motor or its bearings are worn. A banging sound at startup on a boiler or steam system often means water hammer, which is a pressure or balancing issue rather than an equipment failure. Noises are worth describing in detail when you call, because the type and timing of the sound help narrow down which component is involved before the visit is booked.
How does a dirty filter or coil affect system performance?
A clogged filter restricts the volume of air moving through the system, which forces the blower to work harder and reduces how much conditioned air reaches the living space. Over time, restricted airflow causes the evaporator coil to run colder than it should, which can lead to icing and a further drop in output. A dirty evaporator or condenser coil reduces the system's ability to transfer heat, which raises energy use and shortens the time before the next repair is needed. Both are caught during a tune-up before they develop into something more serious.
Emergency No-Heat and No-Cool Calls Handled
We take emergency calls every day from 8:30 AM to 10:00 PM. Describe what the system is doing when you call and we will scope the visit before anyone is dispatched.
How are estimates and pricing handled?
The price is given on the call, before anything is scheduled. We go through what the visit covers, what the repair or installation involves, and what the cost is based on the information available at that point. For installations and replacements, the final scope depends on what the site assessment confirms, and we walk through that on the call so there are no open questions when the visit is booked. The diagnosis is explained in person before any work is authorized, and the price is confirmed before parts are ordered or work proceeds.
When does it make more sense to replace an older system than to repair it again?
The calculation involves the age of the equipment, the cost of the repair relative to the cost of a replacement, and how the system has been performing overall. A repair that costs more than a third to half of what a replacement would cost is worth questioning, especially on equipment that is past the middle of its expected service life. Repeated repairs over a short period, a refrigerant type that is no longer readily available, or a heat exchanger that has cracked all point toward replacement rather than another fix. We go through the specifics on the call and explain what each option involves.
Older Systems and New Installs Both Covered
From a steam boiler in a pre-war Nassau County home to a new heat pump installation, we handle the full range of residential and commercial heating and cooling work.
What causes a compressor or blower motor to fail?
Compressor failures are often the downstream result of other problems: a refrigerant charge that has been low for a long time, a dirty condenser coil that forces the compressor to run hotter than it should, or repeated short-cycling that puts extra stress on the motor windings. Blower motor failures tend to follow similar patterns, with restricted airflow from a clogged filter or a dirty wheel being the most common contributing factor. Catching those upstream problems during a tune-up is the most direct way to extend the life of both components.
How long does a full system replacement typically take?
A straightforward replacement of an existing central air or forced-air heating system, where the ductwork is already in place and compatible, usually takes most of a single day. A more involved job, such as an oil-to-gas conversion, a heat pump installation in a home that previously had no cooling, or a mini-split system serving multiple zones, takes longer because the scope includes more than just swapping the equipment. We confirm the expected timeline on the call when the job is scoped, so you know what to plan for before the visit is booked.
What should I know before attempting a DIY fix on an HVAC system?
Replacing a filter, clearing debris from around the outdoor unit, and checking that the thermostat is set correctly are all reasonable starting points before calling. Beyond that, the work involves refrigerant handling, electrical connections at the equipment, and components that can cause injury if approached without the right tools and knowledge. A system that is not cooling or heating after a filter change and a thermostat check is worth a diagnostic call rather than further DIY investigation. We scope the problem on the phone and explain what the visit will cover before anything is scheduled.
Call (363) 999-8289 and we will go through the details, confirm the scope, and get the right visit scheduled for your property.
(363) 999-8289