Commack HVAC Company handles heating, cooling, and air quality work for homes and businesses across Commack and Suffolk County. Whether you are a homeowner dealing with a system that stopped working, a landlord managing a rental property, or a property manager overseeing a commercial building, we handle the job start to finish. That means diagnosis, repair, installation, and seasonal maintenance, all coordinated through a single call.
We find the fault. We make the repair. We restore the comfort.
Call us at (631) 623-9591 to get a price before anything is scheduled.
Every home's heating and cooling setup tells a different story, and the work we do reflects that. We handle AC repair and installation, furnace and heating repair, heat pump service, ductwork inspection and sealing, thermostat upgrades, indoor air quality improvements, and seasonal maintenance, for residential customers and commercial properties alike.
When a system is not performing the way it should, the first step is a proper diagnosis. Uneven temperatures, weak airflow, and rooms that never quite reach the set point all have causes worth finding before any parts are ordered. Refrigerant leak diagnosis, airflow balancing, and energy-efficiency upgrades are part of the same conversation. HVAC work sized and installed the way the manual calls for is what keeps a system running the way it was designed to.
We are available any hour, any day, including nights, weekends, and holidays. There is no after-hours distinction here.
Call us and we'll get the air running right.
When an AC stops cooling, starts blowing warm air, leaks water onto the floor, or simply will not turn on, the diagnostic visit is where the answer comes from. We check the evaporator coil and condenser, measure refrigerant charge, and inspect the components most likely to cause the symptom you described on the call. If there is a refrigerant leak, we find where it is before recommending a repair path. The system gets checked before parts are quoted.
A full central air installation covers equipment selection, sizing the system to the actual square footage and load of the home, and putting it in correctly. When an older unit is no longer worth repairing, replacement is often the more practical answer, and we walk through that decision on the call. The cost of AC installation is confirmed when the job is scoped, not estimated loosely on this page.
Long Island summers run hot and humid, and a system that has not been serviced since last year may not be ready for it. A spring tune-up covers coil cleaning, airflow verification, refrigerant level check, and thermostat calibration. A system running on clean coils and correct charge uses less energy to reach the same temperature. Reach out and we'll work out what it needs.
A furnace that will not turn on, blows cold air instead of warm, or cycles on and off every few minutes all point to different faults. The diagnostic visit covers the ignition system, heat exchanger, burner performance, and the controls that tell the system when to run. No-heat calls are answered around the clock, any day of the week.
When repair costs are climbing and the system is aging, replacement is often the better investment. Furnace installation cost is explained on the call, before anything is scheduled, so you know what you are agreeing to. Permits handled where the job needs them, and installation done to code.
A fall heating maintenance visit covers the filter, heat exchanger, burner assembly, and the safety controls that protect the system from running outside safe limits. Suffolk County winters are not the place to find out a furnace was not ready. Scheduling before the heating season means fewer surprises when the temperature drops.
For homeowners and property managers who want it done right, a heat pump offers heating and cooling from a single system. In summer it pulls heat out of the home. In winter it extracts heat from outdoor air and moves it inside. When a heat pump is not heating, not cooling, or blowing cold air in heat mode, the diagnostic visit identifies whether the issue is in the refrigerant circuit, the reversing valve, or the controls.
The repair-versus-replacement decision depends on the age of the equipment, the nature of the fault, and what a repair would actually cost. Heat pump installation is also an energy-efficiency upgrade that fits well in a region where electrification is moving quickly. A heat pump tune-up covers refrigerant charge, coil condition, and defrost cycle operation. Installation cost is confirmed when the job is scoped.
Commack and the surrounding parts of Suffolk County have a housing stock that shapes the HVAC work here in specific ways. Older homes built without central ductwork, oil-fired heating systems that have been running for decades, and humid summers that make room-by-room comfort control a real priority, these are the conditions that make the following services especially common in this area.
Many of the older homes on Long Island were built with boilers and radiators rather than forced-air systems. Steam and hot-water radiators are still the primary heat source in a significant share of the housing stock here. A boiler service call covers operating pressure, zone valves, circulator pumps, the expansion tank, and how heat is actually reaching each part of the home.
When a boiler is losing pressure, banging through the pipes, or leaving certain rooms cold, the cause is usually findable without replacing the whole system. Repair versus replacement is a conversation worth having on the call. Filters, airflow and thermostat settings explain more faults than people expect, and the same is true for boiler controls and zone sensors. A boiler heats the living space through a hydronic loop, which is HVAC work, not plumbing.
The Northeast accounts for the vast majority of oil-heated homes in the country, and Long Island reflects that. Homeowners in Commack and across Suffolk County are converting away from oil heat for a range of reasons: fuel price volatility, the cost of oil delivery, and the availability of natural gas in areas where it was not previously accessible.
A conversion involves removing the existing oil-fired equipment and installing the new heating system in its place, whether that is a gas-fired boiler, a gas furnace, or a heat pump. We handle the equipment side of the job. The gas-line run to the unit is plumbing work handled separately. Heat pump conversion is a strong alternative for homes where electrification makes more sense than a fuel switch. The quote is confirmed when the job is scoped.
A ductless mini-split delivers heating and cooling to a specific space without requiring existing ductwork. That makes it a practical answer for older homes built without central air, for room additions, for finished basements, and for any space where running ducts would be invasive or impractical. A single outdoor unit can support multiple indoor heads, each controlled independently, which means different rooms can run at different temperatures.
The installation visit covers mounting the indoor head, placing the outdoor unit, running the refrigerant line set, and connecting the controls. Mini-split repair and service are also available when an existing system needs attention. HVAC service booked around your schedule.
Leaking ducts push conditioned air into wall cavities and attic spaces instead of into the rooms where it belongs. The result is uneven temperatures, higher energy bills, and a system that runs longer than it should to reach the set point. A ductwork inspection identifies where air is escaping. Duct sealing addresses those losses without replacing the full system. When ductwork is too deteriorated to seal effectively, replacement is the more durable fix. Cost is confirmed when the scope is clear.
A thermostat that is not responding, not holding the set temperature, or not communicating with the system is worth diagnosing before replacing the HVAC equipment it controls. Smart thermostat installation and programmable thermostat installation are both straightforward jobs when the wiring is in order. When the wiring is the issue, that gets sorted as part of the same visit. The cost is confirmed on the call.
Tightly sealed homes hold onto airborne particles, dust, and humidity in ways that older, leakier construction did not. Air filtration system installation, whole-home air purifiers, HEPA filter upgrades, and air scrubber installation all address different parts of that problem. HVAC filter replacement is part of routine maintenance and one of the most straightforward ways to protect both air quality and system performance. Humidifier installation can also make a meaningful difference in comfort during dry winter months. No pressure and no gimmicks, just straight HVAC answers.
Calling an HVAC company doesn't have to be stressful, even when the system that went down serves a commercial building. We work with property managers, building owners, and commercial clients across Commack and Suffolk County. Commercial HVAC repair covers rooftop unit service, commercial heating repair, and commercial AC repair across a range of equipment types and building configurations. When a commercial system reaches the end of its useful life, we handle installation and replacement as well. The quote is provided before work is scheduled, so there are no decisions made without a price in hand.
We protect your home. We service your system. We earn the call.
When the heat goes out in January or the AC stops working in August, waiting until morning is not always an option. We are available any hour, any day, including overnight, weekends, and holidays. When you call, someone who knows the trade answers and can scope the job on the phone. No-heat emergencies and no-AC emergencies are both covered on the same terms. What can be arranged is confirmed when you call. We do not make arrival promises on this page. What we can tell you is that the call is answered.
What makes this service different is straightforward: the price is confirmed when the job is scoped, before anything is scheduled. That applies to AC repair cost, furnace replacement cost, heat pump installation cost, ductwork repair cost, and the diagnostic fee itself. You get the rate on the phone. Ask what it covers and you get a straight answer.
HVAC costs vary based on equipment type, system size, and what the diagnosis turns up. A diagnostic visit identifies the fault first. Parts and labor are quoted based on what the job actually requires. There is no estimate handed over before the system has been looked at. Call us and we'll walk you through your options.
Commack is the anchor of our service area, and we work throughout the surrounding parts of Suffolk County. That includes Kings Park, Smithtown, Hauppauge, Brentwood, Dix Hills, Melville, Huntington Station, and Nesconset.
The housing across this part of Long Island spans a wide range of ages and heating configurations, from mid-century homes on oil-fired boilers to newer construction with central heat pumps. The mix of older non-ducted homes and humid summers means the work here covers the full range of what residential and commercial HVAC involves.
When you call, someone who knows the trade answers and can walk through the symptoms with you on the phone. We scope what the visit will cover, confirm the price before anything is scheduled, and get the job on the calendar. The system gets checked before parts are quoted, so you know what the repair involves before any work is authorized.
Yes. We work with homeowners, landlords, property managers, and commercial building owners across Commack and Suffolk County. The range of work is the same on both sides: repair, replacement, seasonal maintenance, and emergency calls. Commercial jobs are scoped with the same process as residential ones, price confirmed before anything is scheduled.
We are available any hour, any day, including Saturdays, Sundays, and holidays. There are no after-hours restrictions and no closed hours.
If the system goes down on a Sunday morning or a holiday evening, call (631) 623-9591 and you will reach someone who can get the job moving.
Call us at (631) 623-9591.
When you reach us, describe what the system is doing or not doing, and we will walk through the symptoms with you. We take emergency calls around the clock, and the visit gets scoped on the call before anyone comes out. Do not attempt to reset the system repeatedly or bypass controls while waiting, as that can complicate the diagnosis.
A system's age and repair history both belong in the replacement decision. If a system has needed multiple repairs in a short period, or if the cost of the next repair is approaching a significant fraction of what a new unit would cost, replacement is often the more practical path. We lay out both options and what each one costs, so you can make the decision that fits the house and the budget. That conversation starts on the call.
The process starts on the phone: we scope the job, confirm what the visit covers, and set the price before scheduling. When the technician arrives, the system is diagnosed before any parts are ordered or quoted. Once the fault is identified, the repair cost is presented and the work is authorized before anything is done.
Pricing reflects the equipment type, the system size, and what the diagnosis turns up, not the square footage of the home as a flat variable. A diagnostic visit identifies the fault first, and the repair or replacement cost is quoted based on what the job actually requires. The price is confirmed before we schedule, so you know what you are agreeing to before anyone comes out.
Yes. Property managers across Suffolk County work with us for multi-unit repair, commercial heating and cooling service, and urgent tenant situations where downtime is not an option. We understand that a unit without heat or AC is a priority, and we coordinate scheduling to minimize downtime. Call to discuss what the account would cover and how billing gets handled.
Yes. HVAC service is booked around your schedule, and because we are available any hour of the day or week, there is flexibility on timing that a business with set hours cannot offer. When you call, we work out what is available and confirm the appointment before anything is locked in. Evening and weekend appointments are treated the same as any other call.
Commack HVAC Company is available any hour, any day.
When you call (631) 623-9591, a real person who knows the trade answers.
The price is confirmed before anything is scheduled. The system gets checked before parts are quoted. A price agreed before each visit. Clear scheduling each visit. Code-compliant every time.
Every heating and cooling job in Commack comes with its own set of variables: the age of the equipment, how the home was built, and what the system has been doing before it stopped working right. The table below covers the services we handle across Suffolk County, who each one fits, and what is practical to know before you call. If a service you need is not listed or you are not sure which row fits your situation, a call gets you a straight answer.
| Service | Scope of Work | Common Needs | Helpful Details |
|---|---|---|---|
| Ductwork Repair & Sealing |
| Homes with uneven temperatures, rooms that never reach the set point, or rising energy bills without a clear cause | Leaky ducts push conditioned air into wall cavities and attic spaces. Sealing the connections is often the fix for comfort problems a new thermostat alone will not solve. |
| AC Repair & Service |
| Homes or businesses with a central AC that has stopped cooling or is running poorly | A system that runs constantly without reaching the set temperature often has a refrigerant or airflow problem, not a failing compressor. |
| Seasonal Maintenance & Tune-Ups |
| Homeowners who want to catch developing problems before the peak heating or cooling season | Scheduling a tune-up before the season means fewer emergency calls and a system that is ready when it is needed most. |
| Boiler & Hydronic Heating Service |
| Homes in Commack and across Long Island with hot-water baseboard or radiant floor heating | Boilers are common in this area's older housing stock. A system banging through the pipes or leaving one zone cold is a diagnostic visit, not a replacement conversation. |
| Indoor Air Quality & Air Filtration |
| Households dealing with dust, allergens, humidity imbalance, or stale air | Filters, airflow, and thermostat settings explain more faults than people expect. We check what the existing system can support before recommending any upgrade. |
| Ductless Mini-Split Installation |
| Homes without existing ductwork, room additions, finished basements, and converted attics | Each indoor air handler operates independently, so a room that runs hot in summer and cold in winter can be dialed in without affecting the rest of the house. |
| Emergency HVAC Service |
| Any situation where the system is completely down, nights, weekends, and holidays included | When you call, you reach someone who can walk through the symptoms, scope the visit, and get the job on the schedule. |
| Full System Installation & ReplacementMost Popular |
| Homeowners replacing an aging or failed system, or upgrading to a more efficient setup | A system's age and repair history both belong in the replacement decision. We scope the job on the call and confirm the price before anything is scheduled. |
| Heating & Furnace Repair |
| Any home with a forced-air furnace that has stopped firing, is short-cycling, or is producing uneven heat | A furnace that runs briefly and then shuts off is often tripping a safety limit, which points to airflow or heat exchanger issues worth catching early. |
| Heat Pump Repair & Service |
| Homes with a heat pump that is not heating or cooling effectively, or that is short-cycling | A heat pump that blows cool air in heating mode often has a reversing valve fault, not a refrigerant problem. |
| Oil-to-Gas & Heat-Pump Conversion |
| Long Island homeowners moving away from oil heat and weighing gas, heat pump, or hybrid options | We handle the heating and cooling equipment side of the conversion. The gas-line run is plumbing work handled separately by a plumber. |
| Thermostat Installation & Smart Controls |
| Homeowners who want better temperature control or are upgrading before or after a system replacement | A smart thermostat configured to match the equipment it runs makes a measurable difference in how consistently a home holds temperature. |
Call us at (631) 623-9591 any hour, any day, and we will walk you through what the system needs and what the visit will cover.
(631) 623-9591