Home energy · free checklist

Feel a draft? Check the gap before buying a fix.

Reviewed November 1, 2026 · General education, not a home inspection or promise of savings.

Start with observation, not a shopping cart. Walk through the home on a windy or cold day and note where you feel air movement. Some fixes are simple, but renters should ask the property owner before making changes, and no one should block required ventilation or combustion-air openings.

Air can leak around doors, operable windows, and other openings. Finding the likely source first helps you avoid buying the wrong material or covering a problem that needs a qualified professional. The U.S. Department of Energy lists air sealing as one part of home energy improvements and points renters toward reversible steps and landlord coordination.

A quick room-by-room draft check

Exterior doors: Check the edges and threshold for visible daylight, loose seals, or a noticeable draft while the door is closed.
Windows: Check where the movable sash meets the frame and around the trim. Note condensation, damaged caulk, or seals that have pulled away.
Wall and floor openings: Note gaps around pipes, cables, or floor trim. Photograph the location for maintenance staff if you rent.
Attic, basement, and garage boundaries: Look for obvious gaps from a safe, accessible location. Do not enter confined, unsafe, or unlit spaces to investigate.
Write down what you find: Record the room, exact location, whether the gap moves, and whether it is a rental or owner-occupied home. Keep notes; no account or bill data is needed.

Know what material is for what job

Weatherstripping is generally used where parts move, such as an operable window or door.
Caulk is generally used for small stationary gaps between fixed materials, when the surface and location are appropriate.
Door sweeps or draft stoppers may address a gap at the bottom of a door, but the right option depends on the door and whether airflow is required.
Large, hidden, wet, damaged, or recurring gaps may need a landlord, weatherization program, or qualified contractor rather than a quick patch.

Renting? Keep changes reversible

Ask the owner or property manager before applying caulk, foam, adhesive products, or anything that could damage a finish or affect a warranty. The Department of Energy recommends checking with the landlord about changes and highlights reversible measures such as draft stoppers, where appropriate. Keep a written response for your records.

Safety checks before sealing anything

Do not cover combustion-air openings, chimneys, flues, exhaust vents, dryer vents, bathroom fans, or other ventilation openings.
Do not use an open flame to look for drafts. If you suspect a gas leak, leave the area and contact the gas utility or emergency services from a safe location.
Do not apply spray foam or other sealants near heat sources, electrical equipment, or hidden building cavities unless the product label and a qualified professional confirm it is appropriate.
If you see mold, water damage, pest activity, or a persistent odor, address that condition before sealing the area.

When to get help: If the draft is widespread, the home has combustion appliances, the gap is inaccessible, or you are unsure whether an opening is required for ventilation, stop and ask a qualified weatherization professional or property manager. A proper assessment can include testing that a visual check cannot provide.

Keep the cost check honest

Before buying supplies or hiring work, compare the total material and labor cost with the actual issue you observed. Any possible comfort or utility-bill improvement depends on the building, weather, energy prices, existing insulation, and quality of the work; this checklist cannot estimate your savings.

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Official sources

This guide is general information, not engineering or safety advice. It contains no product recommendation or paid affiliate link. Verify product labels, building requirements, landlord rules, and local assistance eligibility before acting. Low Bill Lab does not promise savings.

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