Right-sized systems for the Nassau–Suffolk line
Central AC Installation in Farmingdale, NY
Farmingdale straddles the Nassau–Suffolk line, and the housing reflects it: Village colonials and two-family homes near Main Street, mid-century ranches and split-levels toward Route 109, and newer construction on the Suffolk side. Sizing here can't be templated. A 1,600 sq ft split-level with a finished lower level carries a very different cooling load than a 1,600 sq ft ranch with an unconditioned basement.
We run a room-by-room Manual-J load calculation on every Farmingdale quote and read static pressure on the existing ductwork before recommending tonnage. That's how you avoid the two most common outcomes we're called to correct: an oversized unit that short-cycles and never dehumidifies, and an undersized one that runs nonstop through August.
Common problems — with real prices
2-ton systems (up to ~1,400 sq ft)
$5,800–$8,400 installed at 14.3–15.2 SEER2 — suits smaller Village homes and unexpanded ranches.
3-ton systems (~1,400–2,000 sq ft)
$8,500–$12,500 installed. The most common Farmingdale replacement, including most split-levels.
4–5 ton systems (2,000+ sq ft)
$11,500–$16,000 installed, often with a duct modification for the finished lower level.
Variable-speed / high-efficiency
$12,500–$18,500 installed for 18–22 SEER2 — best where humidity control and quiet operation matter.
Zoning and ductless add-ons
$4,200–$7,500 for a two-zone mini-split, the usual fix for a finished attic or bonus room the ducts never reached.
Local service notes for Farmingdale
Village homes without ductwork
Older Farmingdale Village homes often heat with hot water behind plaster and have no ducts at all. For those houses we usually plan ductless heads or a compact attic air handler, so adding central cooling does not mean opening finished walls.
Farmingdale coverage
ZIP 11735 — the village blocks around Main Street and the LIRR station, the ranches and splits near Republic Airport, and the streets bordering South Farmingdale and Bethpage. Ten minutes east of our Levittown shop.
Mixed housing, mixed load
A Main Street two-family, a 1950s ranch, and a 1990s colonial near the airport have very different heat gains. Each gets its own Manual-J load calculation — window area, insulation, orientation, and infiltration — instead of a tonnage guess based on square footage.
Local pricing and equipment details on this page were reviewed by our service team in August 2026. Written by the technicians who run the Farmingdale route out of our Levittown shop.
Why Farmingdale calls us
Load calculation, not a rule of thumb
Manual-J on every estimate, with window orientation, insulation, and finished basement volume all counted.
Warranty registered for you
Depending on the package, labor is covered up to 10 years, plus 10-year parts, registered with the manufacturer on your behalf so coverage actually holds at year eight.
Full scope in writing, old unit hauled away
Every Farmingdale quote lists the equipment model numbers, duct work, and electrical as separate lines, and the full scope is in writing before you sign anything. When the new system goes in, the old condenser and coil leave with our crew, so nothing is left at the curb for you.
Farmingdale questions, answered
Most homes land at $8,500–$12,500 for a 3-ton installed system. Small homes start near $5,800; variable-speed high-efficiency systems reach $18,500.
One day for a changeout on serviceable ductwork; two to three days if we're adding ducts or replacing a furnace and coil at the same time.
Yes — either a high-velocity ducted system or a multi-zone ductless setup. We price both so you can compare comfort against cost.
For most Farmingdale homes 15.2–17 SEER2 is the value sweet spot. Go higher when you run AC heavily or want the dehumidification of a variable-speed system.
Yes, $0-down financing with approved credit, with terms selected around the monthly payment you want rather than the largest system we could sell.
Need it fixed today in Farmingdale?
$199 diagnostic — waived when you approve the repair. Flat-rate price before any work starts.
Call (516) 667-0911