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TRUSTED BY SYOSSET, NY HOMEOWNERS

  • Average homeowner rating star icon4.4
    Average homeowner rating
  • Verified reviews icon415
    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
)
Central A/C - InstallDuctless Mini-split A/C - Install or ReplaceGas Furnace / Forced Air Heating System - Install+11 more

Serving Syosset, NY and surrounding areas

Approved

In business since 2007

Free estimates

Warranties offered

"The guys at MassAir made having to get new central AC units installed, repairs on older units, new vents and ductwork, etc., actually a pleasurable experience! It is a family owned business, and I found Joe and his son Michael to be a real pleasure to work with. They are an extremely professional, proficient, knowledgeable, honest and hardworking team, and I trust them with any HVAC related projects that I have in the future. I 100% recommend giving these guys a call for your HVAC needs! -Mike Vedder"
Furnace
Ductless mini-split
Air Handler
Condenser
Condenser

+9

Response time3 hrs
14 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!"
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+29

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

The best way to reduce heat upstairs is to release it by opening a window. Hot air rises, and if you can create some airflow by opening a window upstairs and also one on a lower level, the hot air should be pushed out of the home. Remember that fans pointing out the window do a much better job of circulating air than fans pointing into the home.

Swamp coolers cost approximately 50 percent less to install than central air conditioners and cost less to run. Operation costs depend on the size of the unit and home, your climate, utility rates in your area, and the system’s efficiency. Swamp coolers use 15 to 35 percent less power than air conditioners.

You should flush your AC drain line once every three months to keep it clear of debris and buildup. Keeping your AC drain line clean prevents clogs, backups, mold growth, and extra wear on your AC unit. If you live in a humid area or have several furry pets, up your cleaning schedule to once a month.

Yes, government incentives and programs are available to encourage energy-efficient upgrades in many regions. These incentives may include tax credits, rebates, grants, and low-interest loans for homeowners who invest in energy-efficient improvements such as HVAC system upgrades, insulation, and efficient windows. The availability and specific details of these incentives can vary by location, so check with your local government or utility company to explore your options.

A 10,000-watt generator can run a small to mid-sized central AC unit (typically up to 3 tons or 36,000 BTU) along with a few other appliances. However, larger AC units or additional loads will require a bigger generator. Consult a local generator installer to ensure you add the correct size generator to your home.

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.