Our Services
Last updated Reviewed by Waseem Shahzad, Lead Technician
Expert HVAC solutions.
Cooling down in a heatwave? Start with AC repair on Long Island, available 24/7. No heat? See furnace repair on Long Island or boiler repair on Long Island.
5% OFF On All Services
First time calling K2? Receive an exclusive 5% discount on all heating, air conditioning, and indoor air quality services with coupon code NEWCLIENT5. Also ask about SAVE250 for $250 off new HVAC installations. Refer a friend with REFER50 for referral credits!

Air Conditioning Repair
Fast 24/7 diagnostic and repair services across Long Island. We resolve frozen coils, electrical failures, refrigerant leaks, and compressor breakdowns on all major makes and models.
- 24/7 Emergency Dispatch
- All Makes & Models Serviced
- Upfront Flat-Rate Pricing

Air Conditioning Installation
High-SEER2 central cooling systems sized with ACCA Manual J load calculations for balanced comfort, matched to your existing ductwork and electrical service.
- Precision Manual J Sizing
- Ductwork Checked Before Sizing
- Warranty registration help

Heating Repair & Emergency Service
Rapid emergency heating diagnostics and repairs for gas furnaces, hydronic boilers, and steam systems across Nassau and Suffolk. Certified combustion safety and carbon monoxide testing on every call.
- Furnace & Boiler Specialists
- Emergency Winter Response
- Certified Combustion Testing

Heating Installation & Boiler Replacement
Ultra-efficient condensing gas furnaces and wall-hung combi boilers achieving up to 98% AFUE. Turnkey oil-to-gas conversions with custom near-boiler hydraulic looping.
- Up to 98% AFUE Efficiency
- Oil-to-Gas Conversions
- Near-Boiler Piping Mastery

Heat Pumps & Ductless Mini-Splits
All-in-one year-round heating and cooling engineered for freezing cold climates down to -13°F. Multi-zone independent room controls, and a common replacement for aging oil boilers.
- Heats Down to -13°F
- Heats and Cools in One System
- Independent Multi-Zone Comfort

Ductless Mini-Split Installation
Single-zone and multi-zone cold-climate mini-splits for additions, finished attics, garages, sunrooms and homes that have never had ductwork. Heating and cooling with room-by-room control.
- Single & Multi-Zone Systems
- No Ductwork Required
- Cold-Climate Heat Pumps

Indoor Air Quality
Media air cleaners, whole-home humidifiers and dehumidifiers, UV systems and duct sealing for Long Island homes dealing with dust, allergies, musty odors or dry winter air.
- Whole-Home Filtration
- Humidity Control
- Duct Sealing

Commercial HVAC Installation & Service
Industrial-grade rooftop packaged units (RTU), custom curb adaptations, crane rigging, and customized preventative maintenance agreements for facilities across Long Island.
- 2 to 50+ Ton RTU Packages
- Custom Maintenance Contracts
- 24/7 Priority Emergency Service
Heating, Water Heater & Emergency Services
Furnace and boiler repair, oil-to-gas conversions, water heaters, seasonal tune-ups and 24/7 emergency service for homes within 15 miles of Deer Park.
Furnace Repair
Gas and oil furnace repair for homes within 15 miles of Deer Park, with no-heat calls answered 24/7.
Furnace Repair on Long IslandBoiler Repair
Steam and hot-water boiler repair, gas and oil, for homes within 15 miles of Deer Park.
Boiler Repair on Long IslandFurnace Replacement
Replacing a worn or failed furnace: when it makes sense, which fuel and system, how it is sized and what installation day involves.
Furnace Replacement on Long IslandThermostat Installation
Installing and wiring smart, Wi-Fi and standard thermostats for furnaces, boilers, central air and heat pumps.
Thermostat Installation on Long IslandHeat Pump Repair
Ducted heat pump and ductless mini-split repair for homes within 15 miles of Deer Park, answered 24/7.
Heat Pump & Mini-Split Repair on Long IslandDual-Fuel Heat Pumps
Dual-fuel heat pump systems that keep your existing boiler or furnace as backup, for homes within 15 miles of Deer Park.
Dual-Fuel Heat Pumps: Keep Your Boiler or Furnace, Add a Heat PumpAC Replacement
Central air replacement for homes within about 15 miles of Deer Park: the old condenser and indoor coil or air handler out, a matched, correctly sized system in.
AC Replacement on Long Island: Replacing an Old Central Air SystemMini-Split Repair
Ductless mini-split repair and maintenance for homes within 15 miles of Deer Park: diagnosis, cleaning, drains, refrigerant and parts.
Mini-Split Repair & Maintenance on Long IslandDuctless Heating
Ductless mini-split heating for homes within 15 miles of Deer Park: planning, installation and winter service for heat pump mini-splits.
Heating With a Ductless Mini-Split on Long IslandAC Coil Cleaning
Chemical cleaning of outdoor condenser coils and indoor evaporator coils for homes within 15 miles of Deer Park.
AC Coil Cleaning on Long Island: Condenser and Evaporator CoilsRooftop Unit Service
Commercial rooftop unit (RTU) and package unit service for businesses within 15 miles of Deer Park: diagnosis, repair, maintenance and replacement.
Commercial Rooftop Unit (RTU) Service on Long IslandOil to Heat Pump Conversion
Replacing or backing up oil heat with a cold-climate heat pump: the options, what the work involves and what drives the cost.
Oil to Heat Pump Conversion on Long IslandOil-to-Gas Conversion
Converting an oil furnace or boiler to natural gas: the steps, the timeline and what drives the cost.
Oil-to-Gas Heating Conversion on Long IslandWater Heaters
Tank and tankless water heaters, gas and electric, repaired and replaced for homes within 15 miles of Deer Park.
Water Heater Repair & ReplacementTankless Water Heaters
Gas tankless water heaters installed, repaired and descaled for homes within 15 miles of Deer Park.
Tankless Water Heater Installation and Repair on Long IslandHVAC Tune-Ups
Seasonal tune-ups for furnaces, boilers, air conditioners and heat pumps, with the readings written down.
Furnace, Boiler & AC Tune-UpsEmergency HVAC
No heat, no AC or water where it should not be: we answer 24/7 and dispatch from Deer Park.
24/7 Emergency Heating & AC RepairDuctwork
Duct sealing, insulation, return-air fixes and new duct runs for homes within 15 miles of Deer Park.
Ductwork Repair & ReplacementSteam & Hot-Water Systems
Service and repair for steam and hot-water heating: boilers, radiators, baseboard, vents, zones and circulators.
Steam & Hot-Water Boiler SystemsGas Lines
Gas connections and piping arranged for the furnaces, boilers, water heaters and packaged units we install.
Gas Line Installation for Heating EquipmentEngineered Cooling & Heating for Long Island's Coastal Climate
Operating heating, ventilation, and air conditioning equipment on Long Island presents unique challenges that generic contractors often overlook. Surrounded by the Atlantic Ocean, Long Island Sound, and the Great South Bay, our homes and commercial facilities endure intense summer humidity waves that demand superior latent moisture removal, paired with harsh coastal nor’easters and sub-freezing winter cold snaps. Moreover, airborne salt spray accelerates galvanic corrosion on outdoor aluminum condenser fins and copper piping, shortening the lifespan of poorly protected equipment.
At K2 Cooling & Heating, our certified mechanical technicians specialize in systems engineered specifically for Long Island properties. Centrally dispatched from our modern operations hub at 60 S 2nd St, Unit V in Deer Park, NY, we provide rapid, licensed service across both Suffolk County and Nassau County. From post-war Cape Cod and split-level homes requiring multi-zone ductless mini-split retrofits to center-hall Colonials and commercial retail strip centers, we provide custom-sized installations and precision diagnostics that deliver balanced, quiet indoor comfort year-round.
Every service call and installation we perform adheres to rigorous mechanical standards. We calculate exact thermal heating and cooling loads utilizing ACCA Manual J methodologies rather than relying on outdated rules of thumb, preventing premature compressor wear and short-cycling. Qualifying cold-climate heat pumps may be eligible for PSEG Long Island Clean Heat rebates. Rebates are claimed through a PSEG Long Island participating contractor or directly with PSEG Long Island, and amounts and eligibility change, so confirm current terms at psegliny.com.
Whether you need urgent 24/7 emergency air conditioning repair on a ninety-degree August weekend, a comprehensive seasonal furnace tune-up, or a full commercial rooftop packaged unit replacement with custom curb adapters and crane rigging, K2 Cooling & Heating is your dedicated pair of hands. We stand behind every job with upfront flat-rate pricing, transparent diagnostic reporting and manufacturer warranty registration help.
24/7 Fast Dispatch
Centrally based in Deer Park for 45–90 min emergency arrival across Long Island.
Licensed & EPA Certified
Licensed mechanical contractor with EPA Section 608 certified technicians.
Cold-Climate Heat Pumps
Sized for Long Island winters. PSEG Long Island Clean Heat rebates are claimed through a PSEG Long Island participating contractor or directly with PSEG Long Island; K2 does not file them.
Upfront Flat-Rate Pricing
Straightforward quotes before work begins.
Frequently Asked Questions
Have questions about your HVAC system? Explore our common inquiries or reach out for personalized expert advice.
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K2 Mechanical provides custom solutions for complex cooling and heating projects. Contact our specialists for a tailored consultation.