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(631) 567-0944

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91-C Knickerbocker Ave
Bohemia, NY 11716

Your Home...

The place you share with those you love most;

your haven in a busy world.

A place whose comfort we're here to protect.


From winter's chill through the dog days of summer, our primary goal at CUSTOM DESIGN is to keep your home comfortable for you and your family.

But, that's just the beginning. We also offer you peace of mind, ensuring your equipment operates safely. We help you save money on your fuel bills. And, we help deliver relief to those with allergies and many others concerned with the quality of the air they breathe.

This site is specifically designed to help you become an informed consumer when it comes to your home's heating and cooling systems. Go ahead, explore. The pull-down menus make it easy. Not only will you learn how these systems work, but also how to shop smart and protect your investment. If you're not sure where to find help with a specific question, try our site's Search Engine. And, don’t miss the 'Answers and Information' section on our menu to learn about your home's mechanical systems and simple things you can do to save money and get the most from them.

If you're curious about what's new in home comfort, here are a few pages you might want to visit:

You'll find we take our job seriously and value highly the trust that is placed in us. To understand why we go so far beyond what others do by investing in the extra training and equipment we believe necessary to protect your home and family properly, take a moment to view our short 30 second video that best explains "why we do it"...and "why it matters."

By doing what it takes to ensure each customer's complete satisfaction, CUSTOM DESIGN is welcome in more homes in Nassau and Suffolk Counties than any other contractor. We invite you to give us a call.

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Custom Design Contracting is a Heating and Air Conditioning service, installation ,repair, replacement and energy efficiency upgrade HVAC company located in Suffolk County NY that services Amityville, Aquebogue, Babylon, Bayport, Bethpage, Blue Point, Bohemia, Bridgehampton, Brightwaters, Centereach, Centerport, Cold Spring Harbor, Commack, Deer Park, East Hampton, East Islip, East Northport, East Setauket, Elwood, Farmingdale, Farmingville, Garden City, Great River, Greenlawn, Hauppauge, Holbrook, Holtsville, Huntington, Islip, Islip Terrace, Lake Grove, Lake Ronkonkoma, Lindenhurst, Manorville, Medford, Mineola, Mount Sinai, Nesconset, North Babylon, Northport, Old Westbury, Patchogue, Port Jefferson, Quogue, Ridge, Riverhead, Rocky Point, Ronkonkoma, Sagaponack, Sag Harbor, St. James, Sayville, Selden, Setauket, Shoreham, Smithtown, Southampton, Stony Brook, Wading River, Water Mill, West Babylon, Westbury, Westhampton, West Islip, West Sayville, Woodbury, and all of Long Island NY. Custom Design Contracting services all furnace, boiler , AC, humidifier, filter, thermostat, UL light and indoor air quality brands including Carrier, Bryant, Comfortmaker, Payne, Trane, Lennox, Rheem, Ruud, York, Amana, Crown, Frigidaire, Gibson, Goodman,Heil, Fujitsu, LG, Weil McLain, A O Smith, American Standard, General, April Aire, Honeywell, White Rogers, Quietside and Skuttle. A LIPA Cool Homes Contractor.