12 Low-Cost Ways to Cut Your Heating Bill

Where the biggest heating losses happen in most homes

Most homes lose heat through air leaks around windows and doors, through uninsulated attics and basements, and via single-pane windows. You can find these problem spots yourself without special equipment: feel for drafts with your hand on a cold day, look for daylight around window frames, and check whether your attic insulation is visibly thin or compressed. The reason this matters is that sealing leaks and adding insulation cost far less than running your furnace longer to replace the heat that's already escaping.

The second major loss is through your heating system itself — a furnace or boiler running inefficiently, a thermostat that doesn't hold temperature, or ducts that leak heated air into crawlspaces instead of into rooms. These problems are less visible but often cheaper to fix than you'd expect, and some utility companies offer rebates or free inspections to help you find them.

Key Takeaways

• Sealing air leaks around windows, doors, and baseboards with caulk or weatherstripping costs under $50 and can reduce heating costs by 10 to 15 percent.
• Adding insulation to an attic or basement is a larger project but often qualifies for utility rebates that cover part of the cost.
• Lowering your thermostat by 7 to 10 degrees for eight hours a day (such as while you sleep or work) saves roughly 10 percent on heating without requiring any materials or installation.
• A programmable or smart thermostat learns your schedule and adjusts automatically, and many utility companies offer them free or heavily discounted.
• Having your furnace or boiler serviced once a year catches problems early and keeps it running at full efficiency.

Sealing air leaks with caulk and weatherstripping

Air leaks around windows and doors are the fastest and cheapest fix. Weatherstripping (foam or rubber tape that sticks to the frame) costs $1 to $3 per window and takes minutes to install. Caulk (a sealant you apply with a caulk gun) costs $3 to $8 per tube and seals gaps between the window frame and the wall. Use weatherstripping on moving parts like window sashes and door edges, and caulk on gaps that don't move.

Check baseboards where the wall meets the floor, especially in older homes — cold air often leaks in at these seams. You can seal them with caulk or foam backer rod (a flexible cord you push into the gap before caulking). Outlets and light switches on exterior walls also leak; you can buy foam gaskets that fit behind the cover plate for under $1 each.

Adding insulation to your attic

Heat rises, so an uninsulated or poorly insulated attic is one of the biggest sources of loss. You can add insulation yourself if you're comfortable in an attic: fiberglass batts (blankets) or blown-in cellulose both work, and the material costs $0.50 to $1.50 per square foot depending on the type and thickness. The U.S. Department of Energy recommends R-38 to R-60 insulation in most climates, which means the thickness varies by region.

If you don't want to do it yourself, many utility companies offer rebates that cover 25 to 50 percent of the cost of professional installation. Contact your utility directly or search "[your state] weatherization assistance" to find programs that may cover the work at no cost if your household income qualifies. Even if you pay out of pocket, attic insulation typically pays for itself in three to five years through lower heating bills.

Insulating basement walls and pipes

A basement or crawlspace that's cold or damp is losing heat through the foundation. You can insulate basement walls with rigid foam board (glued to the wall) or fiberglass batts (framed in place), both costing $1 to $3 per square foot. Start with the rim joist (the band of wood where the foundation meets the house frame) — this area is often uninsulated and is a major leak point.

Exposed heating pipes in the basement also lose heat. Pipe insulation (foam sleeves that slide over the pipe) costs $0.50 to $1 per foot and is one of the easiest DIY projects. Wrapping pipes in the basement or crawlspace can reduce heat loss by 5 to 10 percent and also protects pipes from freezing in very cold climates.

Lowering your thermostat and using a programmable schedule

Every degree you lower your thermostat saves roughly 1 to 3 percent on heating costs. Lowering it by 7 to 10 degrees for eight hours a day (while you sleep or work) saves about 10 percent without any materials or installation. This works because you're not heating an empty or lightly occupied house to full comfort.

A programmable thermostat automates this: you set it once to lower temperature at night and during work hours, and raise it before you wake or come home. A basic programmable thermostat costs $30 to $80 and pays for itself in one to two years. A smart thermostat (like Nest or Ecobee) costs $200 to $350 but learns your schedule and adjusts on its own. Many utility companies offer rebates of $50 to $200 on smart thermostats, which can cut the out-of-pocket cost in half.

Getting your furnace or boiler serviced

A furnace or boiler that hasn't been serviced in years runs less efficiently and uses more fuel to produce the same heat. Annual maintenance (usually called a tune-up) costs $100 to $200 and includes cleaning the burner, checking the heat exchanger, and replacing the air filter. A technician can also spot problems like a cracked heat exchanger or a failing blower motor before they become expensive repairs.

Some utility companies offer free or discounted furnace inspections. Contact your utility to ask whether they have a program, or search "[your city] furnace rebate" to find local incentives. If you can't afford the full cost upfront, ask the heating company whether they offer payment plans.

Replacing or upgrading windows

Single-pane windows lose heat much faster than double-pane or triple-pane windows. Replacing all the windows in a house is expensive (typically $5,000 to $15,000 depending on the number and type), but you can start with the windows that face north or are in the coldest rooms. Some utility companies offer rebates of $50 to $200 per window for upgrades to ENERGY STAR models.

If replacement isn't in your budget, temporary fixes like window film (a plastic sheet you heat-shrink over the window) cost $5 to $15 per window and reduce heat loss by 10 to 15 percent for the winter. Heavy thermal curtains ($20 to $60 per panel) also help, especially if you close them at night and on cloudy days.

Using your water heater and hot water wisely

Heating water accounts for 15 to 25 percent of home energy use. Lowering your water heater temperature from 140°F to 120°F saves money without noticeably affecting comfort (you can adjust it yourself on the dial or digital control). Insulating your water heater tank with a blanket ($20 to $40) and insulating hot water pipes ($0.50 to $1 per foot) reduces heat loss while the water sits in the tank or travels through pipes.

Taking shorter showers and fixing leaky faucets also helps. A single dripping hot water faucet can waste hundreds of gallons a year. Faucet washers cost under $1 and take five minutes to replace.

Blocking drafts under doors and at transitions

Cold air flows under exterior doors and at transitions between rooms. A door sweep (a strip that hangs from the bottom of the door) costs $5 to $15 and blocks the gap. A door draft stopper (a fabric tube you place along the bottom) costs $10 to $30 and is reusable. For interior doors between heated and unheated spaces (like a basement or garage), even a rolled towel placed against the gap makes a difference.

Check the threshold (the piece at the bottom of the door frame) — if it's cracked or missing, you can replace it for $20 to $50 or seal it with caulk. These small fixes add up, especially if you have multiple exterior doors.

Maintaining your heating ducts

Ducts that run through unheated spaces like attics or crawlspaces leak heated air before it reaches your rooms. You can seal visible leaks with mastic (a thick sealant) or foil tape, both costing under $20 for a project. Insulating ducts with fiberglass wrap ($0.50 to $1 per foot) reduces heat loss further. This is a DIY project if you're comfortable working in an attic, or you can hire a professional for $300 to $800 depending on the scope.

A professional duct test (using a blower door to measure leakage) costs $100 to $300 but tells you exactly where the problems are. Some utility companies offer free or subsidized duct testing as part of a home energy audit.

Using zone heating or space heaters strategically

If your house has rooms you don't use regularly, closing vents in those rooms and closing the doors forces heated air into the spaces where you spend time. This works best in houses with multiple thermostats or zone controls. If your system doesn't have zones, you can close vents manually (though closing too many can damage the furnace, so close no more than 25 percent of vents).

A space heater in a frequently used room lets you lower the whole-house thermostat further. A modern space heater costs $30 to $100 and uses about as much electricity as a hair dryer, so it's only cost-effective if you're heating one room while keeping the rest of the house cooler. Never use a space heater in a bedroom while sleeping, and keep it away from curtains and furniture.

Taking advantage of utility rebates and weatherization programs

Most utility companies offer rebates for insulation, furnace upgrades, thermostats, and windows. Some states also run weatherization assistance programs that provide free or low-cost improvements to low-income households. To find what's available in your area, contact your utility company directly or search "[your state] weatherization assistance program."

Weatherization programs typically cover air sealing, insulation, furnace service, and sometimes window replacement. Income limits apply, and there's usually a waiting list, but the work is done at no cost. Even if you don't may have access to for free assistance, many utilities offer payment plans or financing for energy improvements, which spreads the cost over time.

Frequently Asked Questions

How much can I save by doing all of these things?

Savings vary by climate, home size, and current heating efficiency, but homeowners who combine several of these steps typically save 20 to 40 percent on heating costs. Sealing air leaks and lowering your thermostat are the fastest wins; insulation and furnace service take longer but have bigger long-term impact.

Which improvements should I do first?

Start with the cheapest and fastest: weatherstripping, caulk, and lowering your thermostat. Then move to a programmable thermostat and furnace service. Larger projects like attic insulation and window replacement should come later, especially if you can find utility rebates to offset the cost.

Do I need a professional to seal air leaks?

No. Weatherstripping and caulk are DIY-friendly and require no special skills. If you're unsure where leaks are, a utility company energy audit (often free or low-cost) can pinpoint them for you before you start sealing.

What if I rent and can't make permanent changes?

Talk to your landlord about temporary fixes like window film, thermal curtains, and door draft stoppers. These are removable and don't damage the property. Lowering your thermostat and using a programmable thermostat (if you own it) also work in rental homes.

Will a smart thermostat work with my old furnace?

Most smart thermostats work with furnaces built in the last 20 to 30 years, but check compatibility before buying. The thermostat manufacturer's website has a tool where you enter your furnace model and it tells you whether it's compatible. If you're unsure, a heating technician can confirm during a service visit.