Hamilton sits at the west end of Lake Ontario, and the lake runs our humidity schedule. July air arrives heavy and sticky; January air arrives so dry your door handles bite back. Both extremes are comfort problems, and both are fixable — usually more affordably than people expect.

Summer: why 24°C can still feel awful

Comfort isn't just temperature — it's temperature plus moisture. At 60% indoor relative humidity, 24°C feels clammy because sweat can't evaporate. Your instinct is to lower the thermostat, which costs money and often doesn't help much.

Air conditioners dehumidify as they cool, but only while they're running. An oversized AC cools the air quickly and shuts off before it has wrung the moisture out — which is why "bigger" is often the wrong answer at replacement time (see our guide on how estimates are built). Things that genuinely help:

  • Run the fan on "auto," not "on." With the fan always on, moisture that condensed on the coil re-evaporates into your ductwork between cycles.
  • Keep the coil and filter clean. Airflow problems reduce dehumidification before they reduce cooling.
  • Right-size the next system. A properly sized unit runs longer, gentler cycles that pull far more moisture.
  • Basement dampness is its own problem. If the basement smells musty by June, a dedicated dehumidifier beats running the AC colder.

Winter: the static-shock season

Cold air holds little moisture, and when your furnace warms it, indoor humidity can drop below 20% — desert territory. Dry sinuses, cracked hardwood, shocking the cat every time you pet it. Dry air also feels colder, so people nudge the thermostat up and pay for it.

The fix is a whole-home humidifier plumbed into the ductwork. It adds moisture in step with your furnace and, unlike portable units, never needs a tank refill. Target 30–40% in winter; higher than that and you'll see condensation on windows, which invites mould.

The comfortable range is 30–50% relative humidity year-round. A $15 hygrometer tells you where you stand; ten seconds of checking beats months of guessing.

When it's more than seasonal

If one floor is muggy while another is dry, or the problem persists no matter the season, that's usually a ductwork or ventilation story, not a humidifier story. Newer, tighter homes especially can trap moisture (and everything else) inside — our HRV guide covers that. A proper assessment sorts out which problem you actually have before you spend on the wrong fix.

We've been keeping Hamilton comfortable since 1989, and humidity questions are some of our favourites — because the fixes are affordable, reliable, and you feel the difference the same week.