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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 MSD Heating & Cooling
MSD Heating & Cooling
4.9(
74
)
Central A/C - InstallBoiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For Business+47 more

Serving Syosset, NY and surrounding areas

Approved

In business since 2002

Free estimates

Emergency services offered

"Can't speak highly enough of Ali. Prompt, courteous, but most importantly able to get to the bottom of problem without ripping off the customer. AN HONEST MAN! After many years of searching, I've finally found an HVAC repair company that I can trust! Happy days are hear again."
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+1

2 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for MassAir
MassAir
4.9(
65
)
Gas Furnace / Forced Air Heating System - InstallHeat Pump - Install or ReplaceCentral A/C - Install+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
15 neighbors recently requested a quote
Recommended by95%of homeowners
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

"The team of Patience HVAC, Anthony who scheduled the appointment to Cesar the technician were great. They accommodated schedules . Did excellent work, Cesar spent his time with his tools for diagnostics , and then made recommendations. He spent the time needed to do the work , never in a rush . He interacted professionally with us . They are a gem , and the name says it all. They are patient, with clients, patient with there work . I highly recommend them . Rohit Verma"
Peerless
Peerless Boiler with Hot Water
Annual Service
Response time4 hrs
Recommended by100%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%
1 neighbors recently requested a quote
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Heating and Air Conditioning FAQs, answered by experts

ACs don't run on water. They're not connected to drain pipes or any part of your plumbing system. However, they need refrigerant to run. Refrigerant is a gas or liquid that has a low boiling point and absorbs the heat in your home. ACs need this in order to be functional and cool your home. If you suspect your AC is low on refrigerant, you need to contact a licensed HVAC professional. Refrigerant is a dangerous chemical that requires specialized training and permits to work with. 

While an air conditioner can temporarily run with a dirty filter, it is not recommended as it will not work efficiently. A dirty filter forces the system to work harder to circulate cool air, leading to reduced airflow, increased wear and tear, and higher energy bills. This added strain can cause the air conditioner to overheat or fail prematurely. Furthermore, a clogged filter may allow dust and dirt to accumulate in your ductwork, negatively impacting air quality. It is more cost-effective to clean or replace filters regularly than to pay higher utility bills and risk needing to replace the entire AC unit.

The standard HVAC warranty is around five years. Still, many brands offer an extension to 10 years if you register the product within a specific timeframe, typically 60 to 90 days post-purchase or HVAC installation. Over the past decade, warranty periods have substantially increased, shifting from 3-5 years in the 90s to the now-prevalent 10+ year warranties. Both warranty types cover parts failing due to manufacturer defects, incurring no additional costs. Some manufacturers provide extended warranties surpassing the usual 15- to 20-year window, though these often involve extra fees. 

Florida rooms can have heat or air conditioning, although not all do. These rooms can be added to the existing HVAC system or use a mini-split system, or they may just use a ceiling fan or the breeze from the windows for cooling. Florida rooms with air conditioning often have glass windows to keep the cool inside instead of just mesh screens.

Evaporator coils in an HVAC system typically last between 10 and 15 years, which is roughly the same lifespan as the entire AC unit. The longevity of the coils can be affected by usage frequency, environmental conditions, and how well they are maintained. Regular maintenance, such as cleaning and inspections, can extend their durability. If the evaporator coil fails in an older air conditioner, it may be more cost-effective to replace the whole unit rather than just the coil.

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.