How to Keep Your NYC Home Warm Without Overspending

Heating bills in a New York winter have a way of making a drafty house feel personal. Cold floors, a bedroom that never warms up, radiators clanking while the thermostat runs the boiler flat out. Many owners respond by replacing the biggest, most expensive thing, such as the boiler or all the windows, when the cheapest fixes were not done yet.

The approach below goes in order of value for money: stop heat from leaking out, hold it in, make the heating system efficient, then control it intelligently. It is aimed at owners of brownstones, row houses and small homes in Brooklyn and across the boroughs, with notes for renters and co-op owners. Costs are described in general terms; a written, itemized quote after a site visit gives real numbers. Information is current as of October 2026.

1. Find Where the Heat Is Going

Before spending a dollar, spend an hour looking. Heat moves three ways: through materials (conduction), through gaps (air leakage) and by radiating out through glass. In older New York houses, air leakage is often the largest loss, and it is the cheapest to fix.

A simple home walk-through:

• On a windy day, hold a lit incense stick or a strip of tissue near window frames, door edges, electrical outlets, baseboards and the attic hatch. Movement shows leaks.
• Look in the attic. Is there insulation across the floor? Are there gaps around chimneys and pipes? Is the hatch weatherstripped?
• Look in the basement. Examine the top of the foundation wall where the floor framing sits (the rim joist), and any exposed pipes.
• Feel cold spots. Walls on the north side, floors over cold spaces and corner rooms are common problem areas.
• Note which rooms never warm up. They tell you where to focus.

The Department of Energy's Energy Saver resources offer a good do-it-yourself walkthrough of the same steps, and many utilities offer energy audits.

2. Seal Drafts: The Cheapest Fix

Stopping air leaks costs little and pays quickly in comfort. The checklist:

1. Caulk gaps around window and door trim, baseboards and where different materials meet. Use flexible, paintable caulk.
2. Weatherstrip doors and the moving parts of windows. Replace brittle old weatherstripping.
3. Install door sweeps at exterior doors and doors to unheated spaces.
4. Seal electrical outlets and switches on exterior walls with foam gaskets.
5. Close the fireplace damper when not in use, or plug unused fireplaces with a proper insert.
6. Weatherstrip and insulate the attic hatch.
7. Fill gaps around pipes and wires where they enter walls or floors, using fire-rated sealant where required.
8. Check window air conditioners. Remove them in winter or cover them from outside and inside.

Leave exhaust vents, flues and combustion air alone. A house needs controlled ventilation, and a gas boiler or water heater must always have the air and venting it requires.

3. Insulate Where It Counts

Insulation slows the loss that remains after air sealing. In most older houses the order of impact is attic, basement edges, then walls.

• Attic or top-floor ceiling. Heat rises, and uninsulated attics lose it fast. Adding insulation to current targets often gives the biggest gain per dollar. Keep soffit vents clear with baffles.
• Basement and rim joists. Seal and insulate the rim joist with rigid foam or foam sealant; insulate the ceiling of unheated basements or the walls of heated ones, using moisture-tolerant materials.
• Floors over cold spaces. Over a garage, porch or crawlspace, insulation under the floor makes rooms above warmer.
• Walls. Dense-pack insulation can be added to many wood-frame wall cavities, but solid brick and brownstone walls need caution because interior insulation can change how masonry dries. Insulation is rated by R-value, where higher is better, and windows by U-factor, where lower is better.
• Pipes. Insulate exposed hot-water and steam pipes in unheated areas.

If your home is older, be aware that some old insulation materials may contain asbestos, and old paint may contain lead. Test before disturbing suspect materials.

4. Windows: Storm Panels, Weatherstripping or Replacement?

Windows lose more heat per square foot than walls. That does not mean everyone should replace them immediately. A sensible ladder of options:

When you do replace windows, look at the U-factor and the ENERGY STAR criteria for your climate zone. In landmark districts, windows visible from the street may need Landmarks Preservation Commission approval, and brownstone owners in places like Park Slope and Prospect Heights should check before ordering.

5. Make the Heating System Work Efficiently

New York has an unusual mix of heating systems, and tips depend on which you have.

Steam heat

Many older buildings have one-pipe steam systems. Radiator air vents let air out so steam can fill the radiator; broken or mismatched vents cause uneven heating. Replace failing vents, keep radiators clear of furniture and use radiator reflectors behind them on exterior walls. Pipe insulation in the basement reduces losses. Steam systems do best with thermostats designed for them, and boilers need annual servicing.

Hot-water radiators or baseboards

These systems benefit from bleeding trapped air, balancing flows and, in some cases, thermostatic radiator valves that regulate room by room. Insulating basement pipes helps.

Forced-air furnaces

Change filters, seal ducts, particularly in unconditioned spaces, and keep vents unblocked. Leaky ducts can waste a large share of the heat.

Heat pumps

Modern cold-climate heat pumps can provide efficient heating and cooling and are increasingly used in New York retrofits. They are usually best considered after air sealing and insulation reduce the load. An installer should size them properly.

For any boiler or furnace, annual service is a basic cost-saver and safety measure. Gas appliances in New York City will also need gas detectors under Local Law 102 of 2025 from January 1, 2027, so plan for that when scheduling work. Boiler replacement and gas work usually require licensed trades and permits.

6. Control the Heat: Thermostats and Smart Habits

A thermostat does not make heat; it decides when to make it. But using it well saves money.

• Set back the temperature when you are sleeping or away. Even a few degrees for several hours reduces consumption.
• Use a programmable or smart thermostat that is compatible with your system. Steam and some hot-water systems need specific models, and line-voltage baseboards need their own types.
• Zone when you can. Closing doors to rarely used rooms reduces the volume you are heating, but do not shut off heat completely to rooms with plumbing in freezing weather.
• Let sunlight in. Open curtains on south-facing windows during the day, close them at night.
• Use ceiling fans in reverse on low speed to push warm air down in high-ceilinged rooms.
• Keep furniture away from radiators.
• Humidify modestly. A little moisture feels warmer, but too much causes condensation and mold.

Our article on keeping the air clean around us covers the ventilation side of a tight, warm house.

7. If You Rent: Options That Don't Violate Your Lease

Tenants cannot rebuild a window, but they can do a lot, and they have rights.

• Removable window film and draft stoppers cost little and come off at move-out.
• Door sweeps that attach with adhesive can be removed without damage.
• Rugs and curtains reduce radiant cold from floors and glass.
• Radiator reflectors and keeping furniture clear help steam and hot-water systems.
• Report problems in writing. In New York City, owners of multiple dwellings must supply heat from October 1 through May 31 when outdoor temperatures drop below set thresholds. The city's Department of Housing Preservation and Development explains the rules on the HPD website, and tenants can file complaints through the city.
• Ask before making changes, and see our renter renovation dos and don'ts for what is usually safe.

8. Everyday Habits That Save Heat

Small things add up.

1. Run bath and kitchen fans only as long as needed; they exhaust heated air.
2. Keep interior doors open to let heat circulate in rooms with radiators.
3. Cover bare floors with rugs, particularly over cold basements or crawlspaces.
4. Lower the water heater setting a little, and insulate hot-water pipes.
5. Cook and bake at times when you can use the extra warmth.
6. Close storm windows and shutters at night.
7. Maintain gutters and drainage; wet basements feel colder.
8. Wear layers indoors and keep a throw blanket where you sit most.

None of these replaces envelope improvements, but they cost nothing and complement bigger steps.

9. Where a Contractor Earns the Fee

10. Neighborhoods and ZIP Codes We Serve

N.Y. Renovation Services is based on Staten Island and works throughout the five boroughs, Long Island and nearby New Jersey. Brooklyn's heat problems depend on the building.

• Canarsie, ZIP 11236: attached and detached homes with basements and flood-prone blocks. Damp basements feel cold, so moisture control comes before insulation; use water-tolerant materials.
• Park Slope, ZIPs 11215, 11217: brownstones and limestones in the Park Slope Historic District, with plaster walls and pocket doors. Air sealing, attic and window work are the priorities; landmark rules apply to visible changes. See our Park Slope restoration page.
• Prospect Heights, ZIP 11238: brownstones in an LPC district and pre-war co-ops. Storm windows and top-floor ceilings often deliver the best returns.
• Carroll Gardens, ZIP 11231: brownstones with front gardens, LPC district and rowhouses with deep lots. Rear additions and long, narrow houses have long wall areas to seal.
• Borough Park, ZIPs 11219, 11204: large attached homes, multifamily and high density. Shared walls help, while roofs, windows and boilers matter most.
• Bay Ridge, ZIPs 11209, 11220: brick row houses, co-ops and detached homes. Brick wall caution applies, so prioritize attic, windows and boiler care.

Learn more about our work on the Brooklyn renovation services page.

11. Next Steps: Get Your Free Estimate

James - Lead Renovation Editor. With over 20 years in renovation and construction, James writes and edits our guides. More about James