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TRUSTED BY SYOSSET, NY HOMEOWNERS

  • Average homeowner rating star icon4.4
    Average homeowner rating
  • Verified reviews icon431
    Verified heating and air conditioning services reviews

Top-Rated Heating and air conditioning pros in Syosset - Updated Nov 2026

Avatar for K.N. Heating and Cooling
K.N. Heating and Cooling
4.8(
353
)
Oil Boiler or Radiator Heating System - RepairCentral A/C - InstallDuctless Mini-split A/C - Install or Replace+1 more

Serving Syosset, NY and surrounding areas

Approved

In business since 2009

Free estimates

Emergency services offered

"On the hottest day of the year our Central A/C went out. The interior temperature in the house was over 90 degrees.... I called one of the better known companies in the area and they came out looked at the unit for just a few minutes, said the condenser was shot and could not be repaired - they then sent somebody over to give me an estimate for a new A/C system and gave a quote of thousands of dollars. Despite the heat, before jumping into such a big purchase, I wanted a second opinion.... I went to HomeAdvisor for a referral. Within 10 minutes of my HomeAdvisor inquiry I received a call from Kevin of KN. I explained the situation and he said he’d be over in a couple of hours. When he arrived he took the entire u it apart, I told him what the tech from the better known company told/showed me and Kevin began to diagnose the issue. He said the condenser could in fact be shot but he also suggested that the issue could simply have to do with the wiring to the condenser and started to look at that. Ultimately he was right about the wiring. The wire contact to the condenser had come off and that was why there was no power to the 7nitl. He went to his truck, got a new wire, installed it along with a new capacitor, reconnected the system and presto, with these relatively inexpensive parts the unit was up and running once again and as I write this the temperature in my house is a comfortable 73 degrees. The moral to this story is to stick with the small business owner — Kevin knows his trade, took the time to diagnose the issue, did not give up, is reasonably priced and did not try to up sell like the better known company did. I would gladly refer Kevin/KN to anybody who needs HVAC repair."
a/c change out
steam oil boiler replacement
steam oil boiler replacement
indirect hot water heater
indirect hot water heater

+13

Response time2 hrs
3 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for Patience HVAC, LLC
Patience HVAC, LLC
4.9(
30
)
Central A/C - InstallCentral A/C - Service or RepairCentral Air Cleaner - Repair or Service+35 more

Serving Syosset, NY and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"Called Anthony with issues for my commercial HVAC. Anthony was very responsive, and boy is he honest. I think this is the most important attribute that you need. Rather than have people over who have no idea what they are doing and lie to you about what is actually wrong with the unit. I had 1,000 questions, and he was patient with me through and through. He was very prompt, answered my calls, and made time for me in his busy schedule. HE IS AN AMAZING PERSON!! Stop hunting and give Anthony a call. His rates are very very reasonable"
Peerless
Peerless Boiler with Hot Water
Annual Service
Response time4 hrs
Recommended by100%of homeowners
Avatar for MassAir
MassAir
4.9(
64
)
Gas Furnace / Forced Air Heating System - InstallCentral A/C - InstallDuctless Mini-split A/C - Install or Replace+11 more

Serving Syosset, NY and surrounding areas

Approved

In business since 2007

Free estimates

Warranties offered

"Joe and his crew did excellent work, they were very professional and clean. The job was completed when promised and the owner was on the job site for the whole project. The cost of the central air conditioning system was very reasonable. We were very satisfied with the whole install and would definitely use them again."
Furnace
Ductless mini-split
Air Handler
Condenser
Condenser

+9

Response time3 hrs
16 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for Arvada Mechanical Corp.
Arvada Mechanical Corp.
4.8(
18
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+39 more

Serving Syosset, NY and surrounding areas

Approved

In business since 2010

Free estimates

Emergency services offered

"This Company is top notch! They quickly responded to my urgent message in regard to no heat in the house and had the service guy arrive to the door right after completing another job. They were very professional and did the repair in no time and price quoted over the phone was exactly what was charged for the service. We will definitely call this Company again for any boiler repairs. Thank you!"
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+4

Response time8 hrs
Recommended by87%of homeowners
Avatar for AC Air Duct Cleaning
AC Air Duct Cleaning
5.0(
30
)
Air Ducts & Vents - Clean

Serving Syosset, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2020

Free estimates

Emergency services offered

"The assigned technician, John, was on-time, knowledgeable, provided suggestions, and thorough. Oftentimes, people don’t realize how important this service is. If I were you, I would book AC Air Duct cleaning!"
Additional Photos
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+29

Response time7 hrs
Response rate100%
1 neighbors recently requested a quote
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Heating and Air Conditioning FAQs, answered by experts

Window AC units use a fair amount of electricity, but significantly less than central AC systems. Because they are more energy-efficient for cooling individual rooms or small spaces, their usage is comparatively low. On average, a window AC unit consumes between 500 and 1,400 watts, while a central AC system uses over 3,500 watts—meaning a window unit uses about one-third of the energy. This typically translates to a monthly running cost of $15 to $40, although this can vary depending on external factors.

You should only run your dehumidifier in warmer months, such as spring and summer, to get the best performance out of your system. The air gets drier when temperatures drop in the winter months, creating less of a need for a dehumidifier. However, when to run a dehumidifier will depend on your local climate.

Yes, ventless portable air conditioners exist, and not all standard portable air conditioners must be vented through a window.

Ventless portable units, often called evaporative coolers, do not have exhaust hoses. They use a water reservoir and a cooling pad to add moisture to the air, making it feel cooler. These units work best in dry climates because humid areas cannot absorb much additional moisture.

For standard portable air conditioners that do require venting, a window is not the only option; they can also be vented through a door, wall, or ceiling. However, it is essential to vent these units properly. Running a standard portable AC without venting it is counterproductive because it needs to expel heat to cool the room. Failing to do so will only increase the room's temperature.

If there’s a freon leak in your home’s AC unit, it will cause the system to work overtime to cool the house. That issue will result in higher energy bills and it will take much longer for cool air to disperse throughout the home. If your system has a freon leak during the summer, it can make hot days miserable. That’s why it’s important to hire an HVAC professional to resolve a freon leak as quickly as possible.

Yes, mini-split or ductless AC systems add value to a home and do not devalue it. They are an attractive feature for potential buyers, especially in older homes without existing ductwork, as they provide a practical air conditioning solution without the significant expense and hassle of installing traditional ducts. Ductless systems also eliminate issues associated with conventional ductwork, such as noise and the potential for pests. Furthermore, homeowners value energy-efficient solutions, and mini-splits offer high efficiency for both heating and cooling, plus zoned temperature control. This leads to lower energy consumption and reduced electric bills, which is a major selling point.

The Syosset, NY homeowners’ guide to heating and air conditioning services

From average costs to expert advice, get all the answers you need to get your job done.