How to Find Where a Draft is Coming From

Drafts can quietly increase your energy bills by letting heated or cooled air escape. In older homes, especially across Baltimore and the DC metro area where seasonal temperature swings are common, even small air leaks can make a noticeable difference in comfort.

The good news is that finding a draft is usually a simple DIY task. With a few basic techniques, you can identify where cold air is entering your home and decide what to do next.

In this guide, we’ll show you how to detect drafts, where they commonly hide, and how to tell whether you’re dealing with a quick fix or a bigger issue.

How to detect where a draft is coming from in your home

There are several easy ways to check for drafts around doors, windows, and other areas of your home.

Hand test

Slowly move your hand along the edges of doors, door frames, and window frames. Focus on corners and seams where materials meet.

If you feel cool air movement, you’ve likely found a draft.

Candle test

Light a candle and hold it near door edges, thresholds, and frames.

If the flame flickers or leans in one direction, air is moving through that area.

Light bleed test

At night, turn off interior lights and shine a flashlight around the door and window edges from outside.

If light is visible inside, there’s a gap allowing air to pass through.

Incense or smoke test

Light an incense stick and hold it near suspected draft areas.

Watch the smoke:

• If it wavers or changes direction, air is entering or escaping
• This method helps pinpoint the exact direction of the draft

Dollar bill test

Close a door or window on a piece of paper or a dollar bill.

Try to pull it out:

• If it slides out easily, the seal is weak
• If it resists, the seal is working properly

This is especially useful for checking door seals and weatherstripping.

Thermal camera test

For a more advanced approach, use a smartphone-compatible thermal camera.

These tools highlight temperature differences and can reveal hidden air leaks that aren’t easy to feel or see.

Common places drafts hide in your home

Even if you don’t feel a draft right away, there are several areas where air leaks commonly occur:

• Exterior door frames and door sweeps
• Window sash joints and glazing areas
• Electrical outlets on exterior-facing walls
• Attic access hatches or pull-down stairs
• Fireplace dampers and chimney openings
• Basement or crawl space penetrations
• Baseboard gaps where walls meet the floor

In Baltimore and DC row homes, doors are often the most common source of drafts, especially older entry doors with worn seals.

DIY draft detection vs. professional energy audit

DIY draft detection works well for identifying obvious air leaks. However, some issues are harder to detect without specialized equipment.

A professional air leakage test, also called a blower door test, can:

• Depressurize your home
• Reveal hidden leaks throughout the structure
• Provide a complete picture of energy loss

Typical energy audits can range from $100 to $400 depending on the home size and scope.

If you’re unsure about the source of a draft, a professional assessment can help confirm whether the issue is minor or part of a larger problem.

Master Seal can evaluate your doors and windows during a free in-home consultation and help you determine the best next step.

When to replace vs. repair: reading what your draft is telling you

Not all drafts mean the same thing. The location and severity of the draft can help you understand what kind of solution you need. Understanding the source helps you decide whether you’re dealing with a quick fix or a larger upgrade. If replacement is needed, you can explore window installation services in Baltimore for long-term solutions.