Nassau County HVACSame-Day Service
Same-day heating & cooling across all 71 Nassau County towns. Local to Jericho, NATE-certified, rated 5/5 on Google.
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Home+ Quality Shield
NATE-Certified · Licensed & Insured in NY
"Showed up the same day in Mineola and had our system running before nightfall. Honest pricing, no upsell."
What is the best HVAC company in Nassau County?
Home+ Air & Heat is a NATE-certified Nassau County HVAC company headquartered in Jericho, providing same-day heating, cooling, boiler, water heater, and indoor air quality service across all 71 towns in Nassau County. We answer calls 24/7, give flat-rate quotes upfront, back installs with a 1-year labor and 10-year parts warranty, and hold a 5/5 Google rating from local Nassau County homeowners.
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What Happens When You Call
No phone trees. No mystery pricing. Just a clear three-step path.
1. Call or book online
Talk to a real Nassau dispatcher 24/7 — no robots, no phone trees.
2. Same-day diagnosis
A NATE-certified tech inspects, explains, and shows you the options.
3. Honest, flat-rate quote
Upfront pricing before any work begins — repair or replace, your call.
Choose your path
Need help right now?
No heat, no cooling, water leak, or burning smell? Skip the form — we answer the phone 24/7.
Call (516) 259-1191Planning a project?
Replacing a system, scheduling a tune-up, or pricing an oil-to-gas conversion? Book a no-pressure visit at your convenience.
The Local HVAC Contractor Nassau County Trusts
Nassau County homes are not like the rest of the country. Coastal humidity off the Long Island Sound and the Atlantic stresses cooling systems all summer long. Winter Nor'easters push older boilers and furnaces past their limits. And the housing stock — from pre-war Tudors in Garden City to post-war Levittown ranches to North Shore estates — means there is no single "right" HVAC system for the county.
Home+ Air & Heat operates as a Nassau-local company. Our trucks are dispatched from Jericho, our technicians know which towns require which permits, and we have installed in practically every neighborhood between the Queens border and the Suffolk line.
Heating in Nassau County
A huge share of Nassau homes still run on cast-iron oil or gas boilers from the 1970s and 80s. We handle steam and hot-water boiler repairs, modern condensing boiler swaps, gas furnace installs, and full oil-to-gas conversions in coordination with National Grid. When sizing matters, we run the heat loss calc — not a square-footage guess.
Cooling in Nassau County
Coastal humidity changes how AC should be sized and dehumidified. We install central AC, cold-climate heat pumps, and ductless mini-splits — and protect coastal-zone condensers against salt-air corrosion with the right coil coatings and pad placement. Right-sized systems run quieter, last longer, and actually pull humidity out of the air.
Indoor air quality on Long Island
Tight modern envelopes plus seasonal pollen and salt-air particulates put extra demand on filtration. We design IAQ upgrades — high-MERV filtration, UV, fresh-air ventilation, and whole-home dehumidification — that match the system instead of being bolted on.
Permits, code, and warranties
Nassau County mechanical permits are non-negotiable on boiler swaps, gas conversions, and most electrical service work. We file the paperwork and coordinate inspections so the work is on the record — important for resale and for keeping factory warranties valid. Every install is backed by our 1-year labor and 10-year parts coverage.
Nassau County Climate & What It Means for Your HVAC
Nassau County summers average 84°F July highs with 65–72°F dew points, and South Shore towns from Long Beach to Massapequa sit inside a one-mile salt-air corrosion zone that destroys uncoated condensers in 5–7 years. January lows hit 26°F inland (Hicksville, Levittown, Plainview), so cold-climate heat pumps need rated capacity at 5°F — not just a nameplate HSPF.
HVAC Problems Specific to Nassau County
Coastal, post-war, and pre-war housing all create issues a national chain won't notice. We see them every week.
Oil-to-gas conversions
Thousands of pre-1970 Nassau homes still run oil. We coordinate the boiler/furnace swap, National Grid gas line, chimney liner, oil-tank removal, and Nassau permits as one project.
Aging cast-iron steam boilers
Common in Garden City, Rockville Centre, and pre-war Long Beach homes. We service one-pipe and two-pipe steam, and quote modern condensing replacements when the math makes sense.
Salt-air corrosion on the South Shore
Atlantic-side condensers in Long Beach, Atlantic Beach, and Lido fail years early without coastal coil coatings and proper pad placement. We spec the coil package the location actually needs.
Coastal humidity overload
Long Island Sound and Atlantic humidity defeats oversized AC systems — they cool fast, short-cycle, and leave the house clammy. Manual J load calcs and variable-speed equipment fix it.
Undersized post-war ductwork
Levittown, Hicksville, and Plainview ranches were built around small original ducts. Modern higher-CFM systems need rework or static-pressure-friendly equipment to perform as rated.
PSEG electrical capacity
Heat pump and EV charger upgrades can push older 100-amp Nassau panels past their limit. We flag the electrical scope upfront so a replacement isn't derailed by a service upgrade surprise.
Every HVAC Service, Across Nassau County
Heating, cooling, hot water, and indoor air quality — one local contractor for it all.
Cooling Services
AC Repair
Same-day diagnosis, transparent pricing on every Nassau cooling repair.
AC Installation
Right-sized central AC and heat pumps for Long Island homes.
Mini-Split Installation
Ductless comfort for additions, attics, and historic homes.
Heat Pump Installation
Cold-climate heat pumps that work in Long Island winters.
Heating Services
What HVAC Service Costs in Nassau County
Most Nassau County HVAC repairs cost $150–$850 with same-day diagnostic. Central AC installs run $7,500–$14,000, gas furnaces $4,800–$9,500, condensing boilers $8,500–$16,000, and oil-to-gas conversions $12,000–$22,000. All quotes are flat-rate, in writing, before any work begins.
| Service | Typical Nassau Range | Notes |
|---|---|---|
| AC repair (diagnostic + most fixes) | $150 – $850 | Same-day across Nassau |
| Furnace repair | $150 – $850 | Most repairs same visit |
| Boiler repair | $200 – $1,200 | Steam & hot-water |
| Central AC installation | $7,500 – $14,000 | Right-sized, Manual J |
| Gas furnace installation | $4,800 – $9,500 | High-efficiency, permits incl. |
| Cold-climate heat pump install | $9,000 – $18,000 | Whole-home or zoned |
| Ductless mini-split (per zone) | $4,500 – $7,500 | Single-zone install |
| Boiler replacement | $8,500 – $16,000 | Condensing gas, vent + permits |
| Oil-to-gas conversion (boiler) | $12,000 – $22,000 | Includes line, chimney, removal |
| Tankless water heater install | $3,800 – $6,500 | Gas, vented to code |
| Annual HVAC tune-up | $199 | Comfort Members included |
Ranges reflect typical Nassau County pricing for standard residential work. Actual cost depends on tonnage/BTU, efficiency tier, accessibility, ductwork condition, electrical capacity, and permit scope. Installation quotes are free and based on an in-home assessment.
Popular Nassau County HVAC Searches
Why Nassau County Homeowners Pick Home+
Licensed & Insured in NY
Fully licensed Nassau County HVAC contractor with full liability and workers' comp coverage.
NATE-Certified Technicians
Every tech holds North American Technician Excellence credentials — the industry gold standard.
24/7 Emergency Service
Nights, weekends, and holidays — we answer the phone when your heat or AC fails.
Upfront, Honest Pricing
Flat-rate quotes before any work begins. No surprises, no overtime gimmicks.
1-Year Labor / 10-Year Parts
Industry-leading warranties on every installation we perform.
Local to Long Island
Headquartered in Jericho — our trucks are minutes from every Nassau town.
Brands We Service — Any Make, Any Model
Factory-trained technicians for all major HVAC manufacturers
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Don't see your brand? We service all manufacturers. Call us to confirm.
Trusted Across Nassau County
Real reviews from homeowners in your neighborhood
"Home+ came out within an hour when our furnace died on the coldest night of the year. Professional, fast, and fair pricing. They've been our go-to ever since."
Michael R.
"We've used them for both AC installation and annual maintenance. Always on time, always thorough. It's rare to find this level of service anymore."
Jennifer L.
"After getting quotes from 3 companies, Home+ was the most honest and transparent. No upselling, just fixed what needed fixing. Highly recommend."
David S.
"The technician explained everything clearly and even showed me how to maintain my system between visits. That kind of care is why we're now Home+ members."
Maria G.
Nassau County HVAC Financing
Synchrony financing with low monthly payments and deferred-interest options on qualifying installs. Most decisions in minutes.
Year-Round Comfort. Priority Care.
Join Nassau County homeowners who never worry about HVAC maintenance again. Priority service, exclusive discounts, and peace of mind.
Starting at
or $299/year billed annually
vs. booking tune-ups & diagnostics separately
Emergency Heating Repair Throughout Nassau County
Don't see your town? Use the ZIP checker above — we serve all of Nassau County.
Nassau County ZIP Codes We Service
71 ZIP codes across 71 Nassau County towns. If your ZIP isn't listed, call us — we likely still cover it.
Local HVAC Service in Every Nassau County Town
Proudly Serving Nassau County
Fast, reliable service in your neighborhood
Inside Our Top Nassau Neighborhoods
What we actually do, town by town. Tap any neighborhood for the local HVAC page.
HVAC in Jericho
Our headquarters. Trucks roll out of Jericho daily — the fastest response time in central Nassau.
View Jericho pageHVAC in Hicksville
Heavy work in post-war Hicksville ranches: duct rework, panel upgrades, and right-sized AC swaps.
View Hicksville pageHVAC in Syosset
High-efficiency installs and oil-to-gas conversions for North Shore Syosset and Woodbury homes.
View Syosset pageHVAC in Garden City
Pre-war Tudor and Colonial steam-boiler service plus discreet ductless retrofits in protected neighborhoods.
View Garden City pageHVAC in Hempstead
Same-day repair, replacements, and IAQ upgrades across the Town of Hempstead's dense residential blocks.
View Hempstead pageHVAC in Levittown
We know the original Levitt floor plans, attic conditions, and how to retrofit modern HVAC into them cleanly.
View Levittown pageHVAC in Massapequa
Coastal-spec coils, salt-air-resistant condenser pads, and dehumidification for South Shore Massapequa.
View Massapequa pageHVAC in Great Neck
Estate-grade installs on the Great Neck peninsula — multi-zone systems, smart controls, and meticulous finish work.
View Great Neck pageAlso Serving These Nassau Hamlets & Villages
Home+ Air & Heat covers every village and hamlet across the Towns of Hempstead, North Hempstead, and Oyster Bay — same-day dispatch from Jericho, NATE-certified techs, and Nassau County mechanical permits handled in-house. Don't see yours? Call us — we likely cover it.
Town of Hempstead
Town of North Hempstead
Town of Oyster Bay
Nassau County Coverage Map
Headquartered in Jericho — minutes from every Nassau town.
Nassau County HVAC FAQs
Real answers about service, permits, brands, and pricing on Long Island.
Need HVAC Help in Nassau County?
Call now or book online — same-day appointments available across Nassau County.
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