Best HVAC Contractors in Commack, NY (2026)
Commack is central Suffolk — Smithtown Township, inland, no coastal exposure. Housing is dominated by 1960s–1980s split-levels and bi-levels on quarter-acre lots, with ductwork that's the single biggest determinant of comfort.
Top HVAC contractors in Commack
Home+ Air and Heat (Homets Services, LLC)
Local Nassau-based dispatch, Manual J / D / S on every install, PSEG-LI Participating Contractor, 1-year labor / 10-year parts standard.
See Commack pricing & bookHart Home Comfort
Strong central-Suffolk presence with reliable scheduling into Commack and Smithtown.
T.F. O'Brien Cooling & Heating
Mitsubishi Diamond Elite — the right answer when a Commack split-level needs a ductless zone instead of forcing the trunk line.
Flanders Heating & Air Conditioning
Established Suffolk independent for high-efficiency retrofits.
Housing stock & ductwork
Split-level Commack homes were built with single-zone ducted systems that struggle to balance bedrooms against the lower-level den. Two-stage or variable-speed equipment plus a properly placed thermostat (or a second zone) solves more comfort complaints than a SEER upgrade does. Static-pressure testing on the existing return is a basic test the strongest contractors run.
Permits, utility & local quirks
Commack falls under the Town of Smithtown Building Department for permits. PSEG-LI rebates apply. National Grid serves most of Commack for gas — oil-to-gas conversions are still active here on older blocks where buried oil tanks are at the end of their service life.
Get a written estimate from Commack's #1-ranked installer
Manual J sizing, model-number-specific proposal, rebate filing handled at install. No high-pressure sales.
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FAQ — Commack HVAC contractors
Why does my Commack split-level have hot bedrooms in summer?
Split-levels create three thermal zones from one thermostat. Upper bedrooms run 4–8°F warmer than the lower den because the supply runs are shorter and unbalanced. The fix is two-stage equipment with an ECM blower and a balanced or zoned duct system — not a bigger AC. Bigger usually makes humidity and short-cycling worse.
Do Commack homes need permits for AC replacement?
Yes. The Town of Smithtown Building Department requires a permit for new condensers, line-set changes, and electrical disconnects. The contractor pulls the permit and the inspection should be included in the price.
Should I replace my Commack oil furnace with gas or a heat pump?
If gas is on your street, a high-efficiency modulating-condensing gas furnace is the simplest path. A cold-climate heat pump (Mitsubishi Hyper-Heat, Bosch IDS, Trane XV) is increasingly competitive once you factor in PSEG-LI rebates and the 25C federal tax credit — and it's the only path that eliminates the buried oil tank entirely. A good estimate gives you both numbers.