An air conditioner that runs from breakfast to bedtime is not being heroic; it is being overloaded. During a humid Ontario summer, nonstop running is one of the first signs that something in the system or the house needs attention, and the sooner you decode it, the cheaper the fix tends to be.
Too Small, Too Old, or Both
The undersized unit. A unit too small for the home's cooling load runs without pause, cools unevenly, and leaves the air damp because short cycles remove very little moisture. The aging unit. Capacity fades as equipment gets older; worn compressors move refrigerant less effectively and coils lose their ability to shed heat. The pattern homeowners describe is always similar: it used to keep up, and somewhere around the second decade it stopped.
What a Professional Tune-Up Actually Covers
Low refrigerant. A leak or a poor charge leaves the system without enough refrigerant to absorb heat, so it runs long cycles while barely cooling. A leaky, under-insulated house. Warm, moist air seeping through gaps around windows, doors, and the attic adds load the unit was never designed to carry.
A seasonal service from Georgetown Heating & Cooling addresses both sides directly: cleaning coils, testing the refrigerant charge, measuring airflow, and reviewing whether the unit still fits the home as it stands.
A note on thermostats: setting the temperature very low does not make the system work harder, it just makes it run longer. On humid days, a moderate setting with a healthy system often feels better than an extreme setting with a struggling one.
Cooling Is Only Half the Job
An air conditioner does two jobs at once: it lowers the air temperature and it pulls moisture out of the air. On a dry day, one job is easy. During a humid Ontario summer stretch, your system fights both at the same time, and the moisture half is the one that quietly wears it down.
Humid air also feels warmer than it actually is. Twenty-six degrees on a dry afternoon is pleasant; the same twenty-six degrees with heavy July moisture feels sticky and heavy. Your thermostat reads the temperature, not your comfort, so the system keeps running while the house never quite feels right.
Have You Checked the Filter, the Coils, and the Outdoor Unit?
A clogged filter. This is the first thing to rule out because it is the cheapest fix in HVAC. A full filter starves the blower and throttles air to every vent in the house. A dirty evaporator coil. Dust that slips past the filter settles on the cold coil and insulates it, so less cold transfers into the air moving past.
A blocked condenser. Debris, tall plants, or a dryer vent blowing nearby all heat up the outdoor coil and slow the whole system down.
