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Reliance Mechanical Services is Long Island’s full service HVAC solution!

Here at Reliance Mechanical Services, we offer state of the art Solutions with the highest quality commercial and residential service. At Reliance Mechanical Services we boast a courteous team of expert professionals with years of acquired industry experience. We are here to help you make the right choice for your home or commercial property. We provide 24/7 efficient service and offer service contracts, as well as financing solutions based on your needs. At Reliance Mechanical Services, we are proud to consider ourselves Long Island’s most reliable, full service HVAC contractor. We provide free consultations so we can help you design a package that best suits the need of your property and your finances. Allow us the pleasure of securing the comfort for your residential and or commercial needs. Please feel free to contact our helpful team of consultants today. Click on the “Our Team” page to find out more about you’re your trained comfort consultants. We look forward to hearing from you! Reliance Mechanical Service provides HVAC services to Nassau, Suffolk, Long Island and Queens. Call us at 1 (855) RMS-5255 today. If you are having problems with your home heating systems, check out our furnace repair page.

Go to the Nassau residential HVAC service page, Suffolk residential HVAC page or the Nassau Commercial HVAC , Suffolk commercial HVAC service page.

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Customer Testimonials

Testimonials

Just a note to thank you for your prompt handling of our service call to repair our air conditioner. Also your repair service man Frank G. was not only efficient, but quiet and neat, above and beyond his requirement.
South Shore Medical Care & Diagnostics

I have dealt with many service-oriented firms in my life, and can truly appreciate a quality organization such as yours. I have always had a prompt response from your organization to my service calls and questions.
Rick B.

We deal with dozens of trades on our job site and would rank but RMS is one of the top three trades that are a pleasure to do business with. They possess immeasurable work ethic and consistently display a high degree of integrity and professionalism.
Thomas P.

The professionalism and expertise of your installers was evident as they completed installation work without delay or any inconvenience to our operations.
National Grid



Special Offers
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Nassau HVAC coverage Areas

  • Albertson 11507
  • Alden Manor 11003
  • Allenwood 11021
  • Argo Village 11003
  • Atlantic Beach 11509
  • Baldwin 11510
  • Baldwin Harbor 11510
  • Bar Harbor 11762
  • Barnum Island 11558
  • Baxter Estates 11050
  • Bayville 11709
  • Bellerose Terrace 11001
  • Bellerose Village 11001
  • Bellmore 11710
  • Bethpage 11714
  • Briar Park 11793
  • Brookville 11545
  • Carle Place 11514
  • Cedarhurst 11516
  • Centre Island 11771
  • Cove Neck 11771
  • East Atlantic Beach 11561
  • East Farmingdale 11735
  • East Hills 11548
  • East Massapequa 11758
  • East Meadow 11554
  • East Norwich 11732
  • East Rockaway 11518
  • East Williston 11596
  • Elmont 11003
  • Far Rockaway 11096
  • Farmingdale 11735
  • Floral Park 11001
  • Franklin Square 11010
  • Freeport 11520
Garden City 11530
  • Garden City Park 11040
  • Garden City South 11530
  • Glen Cove 11542
  • Glen Head 11545
  • Glenwood Landing 11547
  • Great Neck 11020
  • Great Neck Estates 11021
  • Greenvale 11548
  • Harbor Acres 11050
  • Harbor Hills 11023
  • Harbor Isle 11558
  • Hempstead 11549
  • Herricks 11040
  • Hewlett 11557
  • Hewlett Bay 11557
  • Hewlett Bay Park 11557
  • Hewlett Harbor 11557
  • Hewlett Neck 11598
  • Hicksville 11801
  • Inwood 11096
  • Island Park 11558
  • Island Trees 11756
  • Jericho 11753, 11853
  • Kenilworth 11024
  • Kensington 11021
  • Kings Point 11024
  • Lake Gardens 11022
  • Lake Success 11020
  • Lakeview 11552
  • Lakeville Estates 11040
  • Lattingtown 11560
  • Laurel Hollow 11771
  • Lawrence 11559
  • Levittown 11756
  • Lido Beach 11561
  • Locust Valley 11560
  • Locustwood 11003
  • Long Beach 11561
  • Lynbrook 11563
  • Malverne 11565
  • Manhasset 11030
  • Manhasset Hills 11040
  • Manorhaven 11050
  • Massapequa 11758
  • Massapequa Park 11762
  • Matinecock 11560
  • Meacham 11003
  • Meadowmere Park 11559
  • Merrick 11566
  • Mill Neck 11765
  • Mineola 11501
  • Mitchell Field 11530
  • Muttontown 11545
  • New Cassel 11590
  • New Hyde Park 11040
  • North Baldwin 11510
  • North Bellmore 11710
  • North Hills 11040
  • North Massapequa 11758
  • North Merrick 11566
  • North New Hyde Park 11040
  • North Valley Stream 11580
  • North Wantagh 11793
  • North Woodmere 11581
  • Oceanside 11572
  • Old Bethpage 11804
  • Old Brookville 11545
  • Old Westbury 11568
  • Oyster Bay 11771
  • Oyster Bay Cove 11771
  • Plainedge 11756
  • Plainview 11803
  • Plandome 11030
  • Point Lookout 11569
  • Port Washington 11050
  • Rockville Centre 11570
  • Roosevelt 11575
  • Roosevelt Field 11530
  • Roslyn 11576
  • Roslyn Estates 11576
  • Roslyn Harbor 11545
  • Roslyn Heights 11577
  • Russell Gardens 11021
  • Saddle Rock 11023
  • Saddle Rock Estates 11021
  • Sands Point 11050
  • Sea Cliff 11579
  • Seaford 11783
  • South Farmingdale 11735
  • South Floral Park 11001
  • South Hempstead 11550
  • Stewart Manor 11530
  • Strathmore 11030
  • Sutton Park 11559
  • Syosset 11773, 11791
  • The Terrace 11050
  • Thomaston 11021
  • Uniondale 115538
  • University Gardens 11020
  • Upper Brookville 115451
  • Valley Stream 11580
  • Wantagh 11793
  • West Hempstead 11552
  • Westbury 11568
  • Williston Park 11596
  • Woodbury 11797
  • Woodmere 11598
  • Woodsburgh 11598
  • Suffolk HVAC Coverage Area

    Amagansett 11930
  • Amity Harbor 11701
  • Amityville 11701
  • Aquebogue 11931
  • Asharoken 11768
  • Babylon 11702
  • Baiting Hollow 11933
  • Bay Hills 11743
  • Bay Point 11963
  • Bay Shore 11706
  • Bayberry Point 11751
  • Baycrest 11743
  • Bayport 11705
  • Beach Hampton 11930
  • Beech Croft 11743
  • Belle Terre 11777
  • Bellport 11713
  • Blue Point 11715
  • Bohemia 11716
  • Box Hill 11780
  • Brentwood 11717
  • Bridgehampton 11932
  • Brightwaters 11718
  • Brookhaven 11719
  • Calverton 11933
  • Canaan Lake 11772
  • Captree Island 11702
  • Carver Park 11980
  • Center Moriches 11934
  • Centereach 11720
  • Centerport 11721
  • Central Islip 11722
  • Cherry Grove 11782
  • Cold Spring Harbor 11724
  • Cold Spring Hills 11743
  • Commack 11725
  • Copiague 11726
  • Coram 11727
  • Corneil Estates 11770
  • Crab Meadow 11768
  • Cutchogue 11935
  • Davis Park 11772
  • Deer Park 11729
  • Deer Wells 11780
  • Dix Hills 11746
  • East Hampton 11937
  • East Islip 11730
  • East Marion 11939
  • East Moriches 11940
  • East Northport 11731
  • East Patchogue 11772
  • East Quogue 11942
  • East Setauket 11733
  • East Yaphank 11967
  • Eastport 11941
  • Eatons Neck 11768
  • Edgewood 11717
  • Elwood 11731
  • Fair Harbor 11706
  • Farmingville 11738
  • Fire Island 11770
  • Fire Island Pines 11782
  • Fishers Island 6390
  • Flanders 11901
  • Flowerfield 11780
  • Fort Salonga 11768
  • Gilgo Beach 11702
  • Gordon Heights 11763
  • Great River 11739
  • Greenlawn 11740
  • Greenport 11944
  • Halesite 11743
  • Hampton Bays 11946
  • Harbor Heights 11743
  • Hauppauge 11749
  • Head of the Harbor 11780
  • Heer Park 11757
  • Hither Plains 11954
  • Holbrook 11741
  • Holtsville 11742
  • Huntington 11743
  • Huntington Bay 11743
  • Huntington Station 11746
  • Islandia 11749
  • Islip 11751
  • Islip Manor 11751
  • Islip Terrace 11752
  • Jamesport 11947
  • Kings Park 11754
  • Kismet 11706
  • Knollwood Beach 11743
  • Lake Grove 11755
  • Lake Panamoka 11961
  • Lake Ronkonkoma 11779
  • Lake Ronkonkoma Heights 11779
  • Laurel 11948
  • Lindenhurst 11757
  • Lloyd Harbor 11743
  • Lloyd Neck 11743
  • Manor Park 11950
  • Manorville 11949
  • Marconiville 11726
  • Mastic 11950
  • Mastic Beach 11951
  • Mattituck 11952
  • Medford 11763
  • Melville 11747
  • Mid Island 11805
  • Middle Island 11953
  • Miller Place 11764
  • Montauk 11954
  • Moriches 11955
  • Mount Sinai 11766
  • Nassau Point 11935
  • Nesconset 11767
  • New Suffolk 11956
  • Nissequogue 11780
  • North Amityville 11701
  • North Babylon 11703
  • North Bay Shore 11706
  • North Bellport 11713
  • North Haven 11963
  • North Lindenhurst 11757
  • North Patchogue 11772
  • North Sea 11968
  • Northampton 11901
  • Northport 11768
  • Oak Beach 11702
  • Oak Island 11702
  • Oakdale 11769
  • Ocean Bay Park 11770
  • Ocean Beach 11770
  • Old Field 11733
  • Old Mastic 11951
  • Old Westfield 11784
  • Orient 11957
  • Orient Point 11957
  • Panamoka 11961
  • Patchogue 11772
  • Peconic 11958
  • Pine Air 11717
  • Pine Neck 11963
  • Point O Woods 11706
  • Poquott 11733
  • Port Jefferson 11777
  • Port Jefferson Station 11776
  • Promised Land 11930
  • Quioque 11978
  • Quogue 11959
  • Remsenburg 11960
  • Ridge 11961
  • Riverhead 11901
  • Rivers Edge 11950
  • Rocky Point 11778
  • Ronkonkoma 11749
  • Sag Harbor 11963
  • Sagaponack 11962
  • Saint James 11780
  • Saltaire 11706
  • San Remo 11754
  • Sayville 11782
  • Scotts Beach 11789
  • Seaview 11770
  • Selden 11784
  • Setauket 11733
  • Shelter Island 11964
  • Shelter Island Heights 11965
  • Shirley 11967
  • Shoreham 11786
  • Smithtown 11745
  • Sound Beach 11789
  • South Hauppauge 11722
  • South Haven 11719
  • South Huntington 11746
  • South Jamesport 11970
  • South Setauket 11720
  • Southampton 11968
  • Southold 11971
  • Speonk 11972
  • Stony Brook 11790
  • Strongs Neck 11733
  • Sunken Meadow 11768
  • Terryville 11776
  • Upton 11973
  • Wading River 11792
  • Wainscott 11975
  • Water Mill 11976
  • West Babylon 11704
  • West Bay Shore 11706
  • West Brentwood 11717
  • West Gilgo Beach 11702
  • West Hills 11743
  • West Islip 11795
  • West Sayville 11796
  • Westhampton 11977
  • Westhampton Beach 11978
  • Westhampton Dunes 11978
  • Wheatley Heights 11798
  • Wildwood 11792
  • Wincoma 11743
  • Wyandanch 11798
  • Yaphank 11980
  • Queens HVAC Service Area

    Arverne, NY
  • Astoria, NY
  • Bayside, NY
  • Bellerose, NY
  • Breezy Point, NY
  • Cambria Heights, NY
  • College Point, NY
  • Corona, NY
  • East Elmhurst, NY
  • Elmhurst, NY
  • Far Rockaway, NY
  • Floral Park, NY
  • Flushing, NY
  • Forest Hills, NY
  • Fresh Meadows, NY
  • Glen Oaks, NY
  • Hollis, NY
  • Howard Beach, NY
  • Jackson Heights, NY
  • Jamaica, NY
  • Kew Gardens, NY
  • Little Neck, NY
  • Long Island City, NY
  • Maspeth, NY
  • Middle Village, NY
  • Oakland Gardens, NY
  • Ozone Park, NY
  • Queens Village, NY
  • Rego Park, NY
  • Richmond Hill, NY
  • Ridgewood, NY
  • Rockaway Park, NY
  • Rosedale, NY
  • Saint Albans, NY
  • South Ozone Park, NY
  • South Richmond Hill, NY
  • Springfield Gardens, NY
  • Sunnyside, NY
  • Whitestone, NY
  • Woodhaven, NY
  • Woodside, NY