Yes. K2 Cooling & Heating serves Commack from our shop at 60 S 2nd St, Unit V in Deer Park, 5.9 miles north of Deer Park. We repair and install central air, furnaces, boilers, heat pumps and ductless mini-splits. We answer 24/7 and give you an arrival window when you call.
Reliable Heating & Air Conditioning for Commack Homes
Central mid-island summer heatwaves create severe thermal loads in Commack, where unshaded asphalt driveways and roof lines push attic temperatures above 130°F. AC units with restricted attic airflow or dirty outdoor coils suffer high electrical amperage draws, tripping breakers and burning out run capacitors during peak afternoon demand.
Five Core HVAC Services in Commack, NY
Our Deer Park shop is about 6 miles south of Commack along Commack Road, and K2 delivers full-service heating and air conditioning in Commack, covering central AC tune-ups, furnace service, boilers, and inverter heat pumps.
For rooms the central system does not reach, such as attics, additions and finished basements, we also handle ductless mini-split installation in Commack.
Our Long Island guides to AC repair, furnace repair on Long Island and boiler repair on Long Island cover what fails and what it costs.
1. Air Conditioning Diagnostics & 24/7 Emergency AC Repair
Fast emergency air conditioning repairs in Commack, diagnosing failed capacitors, burnt contactors, blower fan motor faults, and refrigerant leaks.
2. High-Efficiency Central Air Conditioning Installation
High-efficiency central AC replacements and inverter systems engineered for optimal airflow balance across Commack split-level and ranch layouts.
3. Gas & Oil Furnace Repair & Seasonal Heating Tune-Ups
24/7 gas and oil furnace repairs, solving electronic ignition failures, flame sensor lockouts, blower assembly vibrations, and venting issues.
4. Hydronic Boiler Repair, Steam Systems & Combi-Boiler Upgrades
Expert hydronic heating service for residential cast-iron boilers, circulating pumps, zone control valves, and high-efficiency combi-boiler replacements.
5. Cold-Climate Heat Pumps & Ductless Mini-Splits
Whole-home cold-climate heat pump installations providing energy-efficient electric heating and cooling sized to the house with a room-by-room load calculation.
PSEG Long Island sets Clean Heat rebate amounts and rules, and they change; see how the rebates work.
Ductless Mini-Split Installation in Commack
Commack splits and hi-ranches commonly have flex duct in the attic that has sagged and leaked for decades, leaving the bedrooms above the garage and the lower-level family room uncomfortable. A ductless mini-split is a direct way to fix one or two of those rooms without tearing into the attic, and it adds efficient heat for the shoulder seasons. Commack is a short drive up Commack Road from our Deer Park shop, so in-home assessments are easy to schedule.
Ductless mini-split installation: zones, costs and how it works →Housing Stock & HVAC Constraints in Commack
Commack is an established mid-island suburban community built largely during the late 1950s and 1960s, featuring split-levels, ranches, and bi-levels (hi-ranches). A significant percentage of homes have horizontal attic duct installations. Decades of extreme attic heat cycles have degraded original fiberglass flex ducting and dried mastic seals, leading to supply air leakage of up to 30% into hot attics. We provide duct integrity testing, aerodynamic sealing, and high-efficiency inverter heat pump replacements that restore cooling power to every room.
Utility Coverage & PSEG Clean Heat Rebates in Commack
Commack homes receive electricity from PSEG Long Island and natural gas from National Grid. PSEG Long Island's Clean Heat program offers rebates on qualifying cold-climate heat pumps, and homeowners converting from oil often ask about them. Call (631) 414-7141 for a heat pump assessment.
K2 does not file rebate applications. How rebates work
Local Presence in Commack, NY
Straddling the Huntington-Smithtown border along Townline Road, Commack is one of our most active local service corridors. We routinely service residences near Hoyt Farm Nature Preserve, along Scholar Lane near Commack High School, and throughout the suburban streets connecting Jericho Turnpike and Veterans Memorial Highway. Local families trust K2 for honest, dependable HVAC repair and installation.
Permits & Building Regulations in Town of Huntington & Town of Smithtown
Mechanical permits are governed by the Town of Huntington Department of Engineering Services (100 Main Street, Huntington, NY 11743) west of Townline Road; Town of Smithtown Building Department east of Townline Road.
Commack is split between two towns. Homes on the west side of the town line, which follows Townline Road, are in the Town of Huntington and go to the Town of Huntington Department of Engineering Services at 100 Main Street in Huntington. Homes on the east side are in the Town of Smithtown and go to the Town of Smithtown Building Department. Your tax bill shows which town you are in. K2 does not file town permits, so confirm the requirements with the right office before your installation is scheduled.
Services in Commack
Pages for the work our records show we do in Commack:
Recent Work Near Commack
A job in Commack. Completed · photos by our technician
- The problem:
- An odd noise coming from the second floor furnace.
- What we found:
- Loose mounting screws and dry bearings on the draft inducer motor were causing vibration, and the flue pipe had gaps.
- The fix:
- Adjusted the inducer motor and tightened its mounts, which stopped the noise, resealed the flue pipe with metallic foil tape, and cleaned the flame sensor and igniter during a heating tune-up.
Recent work in Commack
Noisy furnace: draft motor vibration fixed and flue resealed
Commack · Furnace Repair · October 2026
Loud fan noise traced to a vibrating draft inducer motor. We tightened it, resealed the flue pipe and tuned up the furnace.
Older R-22 system: new capacitor and a cleared drain line
Commack · AC Repair · September 2026
A service call on an older R-22 system: a bad capacitor replaced, refrigerant confirmed good, and a leaking drain line cleared with nitrogen.
Goodman condenser fan motor and capacitor replaced
Commack · AC Repair · July 2026
On a Goodman first-floor system, a failed condenser fan motor was replaced along with the capacitor, and the condenser pad was replaced.
More jobs in Commack: Leaking mini-split: drain line cleared and outdoor coil cleaned · No heat: failed furnace control board and igniter replaced
Nearby Areas We Serve
K2 also serves the towns around Commack. Our closest local pages:
- HVAC repair in Elwood, NY
- HVAC repair in East Northport, NY
- HVAC repair in Dix Hills, NY
- HVAC repair in Kings Park, NY
- HVAC repair in Greenlawn, NY
- HVAC repair in Northport, NY
See every town we cover on the Suffolk County service area page.
Frequently Asked Questions in Commack, NY
How fast can an emergency HVAC crew reach Commack?
Technicians arrive in Commack traveling straight up Commack Road or Townline Road from our Deer Park shop. Our service fleet provides rapid 24/7 diagnostics for failing air conditioners, noisy furnaces, and hydronic boiler breakdowns. Call (631) 414-7141.
What HVAC systems suit Commack split-level homes best?
Commack split-levels frequently develop severe temperature splits between lower dens and upper bedroom levels. Multi-zone ductless mini-splits or zoned inverter heat pumps allow family members to dial in individual comfort levels on every tier of the home without overworking the central system. Call (631) 414-7141 for advice.
Does Townline Road divide HVAC permit jurisdictions in Commack?
Yes. Commack spans the Town of Huntington (west of Townline Road) and the Town of Smithtown (east of Townline Road). West-side homes file with the Town of Huntington Department of Engineering Services, and east-side homes file with the Town of Smithtown Building Department. Your tax bill shows which town you are in. K2 does not file town permits.
What rebates can Commack homeowners claim for installing a heat pump?
Commack homeowners who install a qualifying cold-climate heat pump may be eligible for PSEG Long Island Clean Heat rebates. Call (631) 414-7141 for a heat pump assessment.