10 mistakes that make a house harder to heat in winter

When your house won’t stay warm, it’s not always the heater’s fault. Sometimes the problem comes down to small mistakes that let warm air escape or keep your system from working efficiently. Fixing these issues not only makes your home more comfortable but also lowers your energy bill.

Ignoring Drafty Windows

Old or poorly sealed windows let cold air sneak in and warm air leak out. Even if you can’t afford new windows, using weatherstripping or plastic film kits can make a big difference. Heavy curtains also help trap heat inside.

Blocking Vents with Furniture

It’s common to push a couch or bed over a floor vent without realizing it. This blocks airflow, forcing your system to work harder. Rearranging furniture so vents are clear keeps heat circulating evenly throughout the house.

Skipping Insulation

Insufficient insulation in attics and walls means heat escapes quickly. Many older homes lack enough insulation, making it worth checking and upgrading if needed. It’s one of the best long-term fixes for keeping a home warm.

Not Closing the Damper

If you have a fireplace, leaving the damper open after a fire is like leaving a window cracked all winter. Warm air rushes up the chimney while cold air pours in. Always double-check that it’s closed once the fire is out.

Forgetting Door Draft Stoppers

Exterior doors often have gaps at the bottom that let in cold air. A door draft stopper or weather seal keeps that chill from creeping inside. Even a rolled-up towel can help in a pinch.

Overusing Space Heaters

It’s tempting to run multiple space heaters, but they use a ton of energy and often don’t heat evenly. Relying on them instead of addressing insulation or airflow issues ends up costing more in the long run.

Thin Curtains in Winter

Light curtains are great for summer, but in winter they don’t trap heat. Switching to thicker, lined curtains helps keep warm air from leaking out at night. Open them during the day to let sunlight naturally warm the room.

Skipping Furnace Maintenance

If your furnace isn’t serviced, it won’t run efficiently. Dirty filters and clogged parts make it struggle to push warm air through the house. A yearly check-up is worth it to keep things running smoothly.

Leaving Gaps Around Pipes

Pipes that run outside walls often have gaps where cold air seeps in. Sealing those spots with foam or caulk keeps drafts from sneaking into your home and helps your system work more effectively.

Closing Too Many Vents

Some people think closing vents in unused rooms saves money, but it can actually throw off your system’s balance. It creates pressure problems and makes heating less efficient. Keep vents open to maintain steady airflow.

*This article was developed with AI-powered tools and has been carefully reviewed by our editors.