19.10.2026

A Home Air Checklist for Heating Season: What Should You Check?

As the weather turns colder, we spend more time indoors with the windows closed and switch on the heat. It’s a good time to take a few minutes to check your home’s ventilation, humidity and air purifier filters. A quick check can help you spot rooms that may need extra attention. This checklist will help you get ready for heating season without major renovations or complicated equipment.

1. Check how well your home is ventilated

Cooking, showering and drying clothes all add moisture to indoor air. Regular ventilation can help replace stale air and remove some excess moisture. The U.S. Environmental Protection Agency (EPA) also includes proper ventilation among its basic recommendations for indoor air quality.

Check that:

  • Vents are clear and unobstructed.

  • The bathroom exhaust fan and kitchen range hood are working.

  • You can air out the room after cooking or showering.

  • No rooms regularly feel stuffy or smell musty.

If your home has a mechanical ventilation system, maintain it and replace its filters according to the manufacturer’s instructions.

2. Keep an eye on humidity and condensation on windows

A simple hygrometer can help you monitor indoor humidity. The EPA’s guidance for homeowners recommends 30–50% as a general range. The right level can vary depending on your home and the season. Read more in our article about ideal indoor humidity. Also notice whether your windows often or persistently fog up, or whether you see damp patches or smell mustiness. These may be signs that it’s worth looking into the source of the moisture and checking your ventilation. The WHO’s guidance also emphasizes preventing persistent dampness and indoor mould.

3. Dust your radiators and the areas around them

Before heating season, wipe down radiators, the areas around heaters and hard-to-reach surfaces. Use a cleaning method suitable for the surface, and wait until the heater has cooled before cleaning it. Then vacuum up any dust or debris that has fallen onto the floor.

4. Check your air purifier’s filter

If you use an air purifier, check when you last inspected or replaced its filter. The steps vary by model, so follow the user manual. An air purifier can complement regular cleaning and ventilation, but it doesn’t replace reducing indoor pollution sources or ensuring adequate air exchange. If you’re still deciding what to buy, read our article on the difference between air purifiers and humidifiers.

5. Look for possible sources of moisture

Think about where a lot of moisture is produced in your home, such as the bathroom, kitchen or wherever you dry clothes indoors. If you regularly find damp surfaces or condensation, try to identify the cause and make sure the area is properly ventilated. Don’t treat persistent or recurring dampness and mould with surface cleaning alone. You may need to find and address the underlying cause, with help from a professional.

6. Build an easy-to-maintain ventilation routine

Adapt your ventilation routine to your home, the weather and outdoor air quality. Air out rooms after cooking, showering or cleaning, and make sure vents aren’t blocked. If you have a heat-recovery or other mechanical ventilation system, follow the manufacturer’s instructions.

Quick checklist for the start of heating season

  • Vents are clear and unobstructed.

  • The kitchen and bathroom exhaust fans are working.

  • I’ve checked the humidity and am watching for persistent condensation on the windows.

  • I’ve dusted the radiators and the areas around them.

  • I’ve checked the air purifier filter according to the user manual.

  • I’ve thought about where excess moisture is produced in my home.

A check before heating season doesn’t replace professional maintenance of your ventilation system or heating equipment, but it can help you spot in time when a room needs extra attention.