How do I stop my bathroom mirror from fogging up?

Fog-free mirrors come down to one simple principle: keep the mirror surface warm enough that condensation can't form on it. There are a few effective ways to achieve this, ranging from quick DIY fixes to permanent solutions.

The most reliable long-term solution is a heated mirror or mirror defogger pad. These are thin electrical heating elements that mount behind your mirror and keep the surface just warm enough to prevent condensation. They're wired into your bathroom's electrical system and can be controlled by a switch or tied to your exhaust fan. This is the same technology used in high-end hotel bathrooms and it works exceptionally well in Ottawa's humid winters when temperature differentials are more extreme.

For a no-cost immediate fix, try running your exhaust fan before and during your shower, not just after. Many homeowners only turn the fan on once the mirror is already fogged — by then the moisture is already in the air. Running it proactively removes humidity before it can settle on surfaces. You can also wipe the mirror with a small amount of shaving cream or dish soap and buff it off — this leaves a thin film that prevents water droplets from beading and fogging.

Upgrading your exhaust fan is worth considering if your current one is undersized or aging. Ottawa Bathrooms recommends fans rated for your bathroom's square footage — a fan that's too small simply can't keep up with steam from a hot shower.

If you're planning a bathroom renovation, a built-in mirror defogger is an easy and relatively inexpensive upgrade to add during the electrical rough-in phase. It's much simpler to install during a reno than retrofitting later.

For a quick DIY approach, start with the shaving cream trick and improve your fan habits. If you want a permanent, elegant solution — especially as part of a larger bathroom update — ask about heated mirror options when you request a free consultation with Ottawa Bathrooms.