AC Installation in Commack, NY

The September 2022 Commack job was a cooling-only system built for the first and second floors, with two 4-ton Rheem air handlers and two 4-ton Rheem condensers. The August 2026 job replaced one attic air handler and its outdoor condenser with a 3-ton system and new copper lines.

Those two projects show the range. One house had no central air worth keeping and needed all-new supply and return ductwork, a new central return, line sets and two equipment pads. The other had a sound duct layout, so the work focused on the equipment: the old air handler came down from the attic, the condenser was pumped down and hauled off, and the old materials were disposed of under local rules.

Two systems let each floor run on its own thermostat. In the September 2022 Commack install, one 4-ton air handler served the first floor and a second served the upstairs, each with its own condenser outside, so the bedrooms stopped depending on cool air pushed up from below.

Commack's multi-level houses are prone to a temperature gap: the lower den stays cool while upstairs bedrooms bake under a roof that turns the attic oven-hot in July. A single system sized for the whole house tends to satisfy the thermostat downstairs and shut off before the top floor is comfortable. Splitting the load costs more up front but gives each level its own control. Where two systems aren't practical, zoning with dampers or a ductless head for one problem room are alternatives worth pricing.

Both Commack attic air handlers we installed hang from Kindorf channel and threaded rod rather than resting on the joists. Suspending the cabinet keeps vibration out of the ceiling below, and leveling it lets condensate leave the coil instead of pooling in one corner of the unit.

Under each unit goes a drain pan, and the 2022 build ran new primary and secondary drain lines for both systems. In the 2026 change-out, the existing drain lines were disconnected along with the old pan, then reconnected to the new equipment once a fresh pan was in place. A clogged attic drain is one of the most frequent summer calls in hi-ranches, and the stain usually shows up on a bedroom ceiling first. A float switch in the pan, kept free of debris, is inexpensive protection against that.

Usually, yes. The August 2026 Commack replacement ran new copper between the attic air handler and the outdoor condenser, and the 2022 build got new line sets pressurized with nitrogen after installation. Fresh copper removes the guesswork about old oil, moisture and kinks in a line that's decades old.

Many Commack homes still have the line set from their first central air system, sometimes from the R-22 era. Running new copper means checking the path from attic to yard, which in a split-level often follows an exterior chase down the siding. Outside, a level stability pad keeps the condenser from settling into the lawn, and we place it away from dryer vents and sprinkler heads. Sun-baked driveways and roofs work condensers hard in July, so open space around the unit matters.

It depends on your side of Townline Road. Homes west of it are in the Town of Huntington and use the Department of Engineering Services at 100 Main Street, Huntington. Homes east of it are in the Town of Smithtown and use the Town of Smithtown Building Department. K2 does not file permits.

The boundary isn't obvious from the street, so a property tax bill is the quickest way to confirm which town your house belongs to. Please check the requirements with that office before your installation is scheduled. Once your quote is settled, we're glad to hand over the equipment details an office may ask about, such as model numbers and tonnage.

Every Commack installation is quoted in writing after we visit the house. The figure depends on tonnage, whether ducts are reused or replaced, how many systems the home needs, attic access and the line set route. Our AC installation cost guide for Long Island walks through those factors one at a time.

For a look at finished work, see the Deer Park central air replacement with a new line set and the Dix Hills project where attic ductwork was rebuilt along with the cooling. After start-up we help register your new equipment with the manufacturer; our warranty page covers that step. More detail lives on the AC installation service page and the Commack HVAC hub, and we work in neighboring Smithtown and Dix Hills too.