Find trusted air conditioning & heating professionals serving Long Island. All contractors are independently researched and certified.
Only companies with a Certified Best Pick® badge meet our strict satisfaction & licensing requirements and are eligible for the Best Pick Guarantee.
Only companies with a Certified Best Pick® badge meet our strict satisfaction & licensing requirements and are eligible for the Best Pick Guarantee.
"NH Ross is your go-to for reliable plumbing, heating, cooling, and electrical solutions on Long Island. Our commitment to excellence, coupled with a blend of expertise and local warmth, ensures top-notch service. Experience the comfort and reliability that make us your go-to home service provider in Suffolk and Nassau County."
"Practice makes perfect, and we've been at it for over 60 years! My father founded Varsity with a simple dream: To lead by example and demonstrate the value of honest, hands-on work. It's an honor to uphold those values by serving our neighbors with integrity and delivering lasting results."
"Tragar provides complete comfort solutions for Long Island families so they can focus on living. We value all the virtues of a loving home: Caring, dependability, trustworthiness, and fairness for our clients, team, and community. Our service commitment begins with the first contact. Since 1956, Tragar has been the Family of Comfort."
Real homeowners looking for air conditioning & heating in your area
"Good evening. Looking for a central AC inspection, and AC lines re-routed or adjusted due to kinks."
"gas heating and cooling annual contracts"
"Oil burner service and contract."
"Replace 1 2 ton condenser 1 3 ton condenser 1 Handler"
"Central AC routine maintenance"
"Cost of installation in financing."
Every Best Pick company in Long Island is independently researched and certified annually. We analyze thousands of customer reviews, verify licensing and insurance, and confirm each company meets our strict qualification standards.
We conduct extensive satisfaction surveys and analyze thousands of customer experiences annually.
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Companies earn Best Pick certification through performance alone. Only businesses with 80%+ recommendation rates qualify.
Best Pick status isn't permanent. Every certified company must re-qualify annually.
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Insured
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We stand behind our certified companies with a financial guarantee up to $2,500.
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Only air conditioning & heating companies that meet our strict standards earn Best Pick status.
Air Conditioning & Heating companies must maintain a 4.0+ rating and an 80% recommendation rate.
Current state contractor license verification and general liability insurance for air conditioning & heating work
Minimum 1 year in business with established local presence
Maintain active business registration and in good standing with the state
Consistent air conditioning & heating service quality across all projects
Must re-qualify every year through new research
Common questions about Certified Best Pick® air conditioning & heating companies in Long Island
Best Pick Certified Air Conditioning and Heating companies in Long Island have earned their status through independent consumer research—not paid placement. To qualify, a company must meet strict standards:
Certification is re-verified annually, ensuring continued performance.
No. Air Conditioning and Heating companies cannot buy Best Pick Certification, improved ratings, or better placement. Our research team independently evaluates companies based on customer satisfaction, licensing, insurance, and business stability—before any business relationship exists.
Companies that earn certification pay a participation fee after qualifying, which covers the cost of ongoing research and publication. This fee has no influence on whether a company qualifies or how they appear in our directory.
The Best Pick Guarantee provides financial protection—up to $2,500 in labor costs—if a Certified Best Pick Air Conditioning and Heating company fails to deliver on their commitments.
To be eligible:
This guarantee applies only to Certified Best Pick companies, not Standard Pros. Full terms are available on our guarantee page.
Long Island homeowners most frequently encounter AC units not cooling properly during summer and furnaces failing to heat in winter, along with persistent thermostat malfunctions.
Key local factors:
The predominant 1950s-era housing stock means many systems are operating beyond their intended lifespan. Combined with Long Island's extreme seasonal humidity variation and coastal weather risks, these older systems face significant strain that leads to frequent breakdowns during peak summer and winter months.
Long Island's IECC Climate Zone 4A mixed-humid climate creates unique challenges for HVAC systems year-round.
Summer impacts: With average July highs of 82°F and extreme humidity from June through September, AC units work significantly harder during heat waves above 90°F. Cooling efficiency decreases as outdoor temperatures rise, and prolonged operation causes increased wear on compressors and condensers. Call volume increases 2-3 times normal levels during the first major heat wave.
Winter considerations: January lows averaging 27°F with 96 freeze days annually strain heating systems considerably. Traditional heat pumps struggle below 20-30°F, requiring auxiliary heat, while winter service calls also spike 2-3 times normal volume during the first cold snap.
Best timing: Spring and fall offer optimal installation conditions with better contractor availability and 10-15% pricing discounts, allowing systems to be tested in both heating and cooling modes before peak seasons arrive.
HVAC project timelines in Long Island vary significantly based on complexity and seasonal demand.
Scheduling varies dramatically by season, with emergency repairs available same-day to 24 hours, routine work taking 3-7 days, and major installations requiring 1-3 weeks that extends to 2-4 weeks during peak summer and winter demand periods.
If your home feels uncomfortably damp even when the air conditioner is running, your system is likely failing to combat the heavy moisture rolling in from the Atlantic and Long Island Sound. This high humidity allows biofilm and algae to grow quickly in condensate lines, often leading to water backups in attic-mounted units. Homeowners in older postwar areas like Levittown should also listen for banging or rattling from the vents; many of these 1940s-50s Cape Cods still utilize their original, uninsulated sheet metal ductwork that can rattle as joints loosen over decades. If you notice your energy bills spiking during our long, humid summer stretches, it’s a sign that an aging unit—likely one from the lower-efficiency SEER era—is working far harder than it should to keep up with the load.
Before you call for service, a few local checks can resolve common issues caused by our maritime environment. Check your outdoor condenser unit for salt crust or debris; salt air from the South Shore can cause rapid buildup on coils that blocks airflow. Next, look at your air filter, especially during the peak spring tree pollen season in late April, as a clogged filter will choke a system already stressed by high humidity. If you live in a multi-story home built during the 1970s suburban growth spurt, ensure your thermostat isn't located near a drafty window—our frequent coastal nor'easters can trick sensors into running your furnace or AC unnecessarily. For those with equipment nearing 15 years of age, check PSEG Long Island’s current energy efficiency programs to see if a simple tune-up is incentivized before you pay full price for a service call. If you suspect an electrical failure or a refrigerant leak, stop immediately and contact a licensed professional, as these high-pressure systems require specialized tools.
Local technicians spend much of their time providing oil-to-gas or oil-to-heat-pump conversions, a service driven by our high concentration of aging oil heating systems. Because we experience both cold nor'easters and muggy summers, many homeowners are opting for dual-fuel systems that offer reliable warmth in winter and superior humidity removal in July. Ductwork repair is also essential here, as the sheet metal or flex ducts in many 1960s-era ranch homes have developed significant air leaks, making it nearly impossible to cool upper floors during August heat waves. Additionally, specialized coil cleaning is a high-demand service for coastal properties, where salt spray from the ocean creates a corrosive film that can eat through a condenser in just a few years if not professionally maintained.
To find the best HVAC company in Long Island, start by verifying that any technician entering your home holds an EPA 608 certification for safe refrigerant handling and NATE certification for technical proficiency. They should also carry full general liability and workers' compensation insurance to protect you from liability during complex installations. A true local expert will be deeply familiar with National Grid or PSEG Long Island rebate programs, ensuring you get maximum value when replacing an aging furnace or AC. You can simplify this search by using Best Pick Reports, which identifies top-rated companies through a 6-step merit-based process that verifies licenses and performs independent customer surveys. This annual re-verification ensures the company maintains high standards, and using a certified pro gives you the backup of a $2,500 labor guarantee.
