Every July, the same thing happens across the GTA. Air conditioners run around the clock, pool pumps hum all day, hot tubs stay heated, and somewhere in the house a breaker trips for the third time in a week. For a lot of homeowners, summer is when they discover their electrical panel is running out of room.
Your panel is the heart of your home's electrical system. Every circuit in the house starts there, and the panel has a fixed capacity for how much it can safely deliver at once. Understanding that capacity, and recognizing the signs you're pushing past it, can save you from nuisance breaker trips at best and genuine safety hazards at worst.
Most homes in the GTA have either a 100 amp or 200 amp electrical service. Older homes, particularly those built before the 1980s, often still run on 100 amps or even 60 amps in some cases. That was plenty when a home had a furnace, a fridge, a stove, and some lights.
A modern household asks far more. Central air conditioning alone typically draws 20 to 40 amps when running. A pool pump adds more. A hot tub usually requires its own dedicated 50 or 60 amp circuit. Add an electric dryer, an induction range, a finished basement, and perhaps an EV charger, and a 100 amp panel can be spoken for entirely before you plug in a single toaster.
The panel doesn't need to be maxed out on paper to cause problems. What matters is simultaneous load, and summer is exactly when everything runs at once.
Your electrical system usually tells you when it's near its limit. Watch for:
Breakers that trip repeatedly. An occasional trip is the system doing its job. The same breaker tripping over and over means that circuit is chronically overloaded.
Lights that dim when appliances start. If the lights flicker every time the AC compressor kicks in, the system is straining to deliver the startup surge.
A warm panel or a faint burning smell near it. This is not a wait-and-see symptom. Turn off what you can and call a licensed electrician promptly.
No open slots in the panel. If you're planning any addition, from a hot tub to a basement renovation, and the panel is physically full, you've reached a decision point.
Buzzing or crackling from the panel. Panels should be silent. Sounds indicate loose connections or failing breakers.
We wrote previously about the electrical requirements for hot tubs, and pools follow similar logic. Both require dedicated circuits, proper GFCI protection, and wiring rated for outdoor and wet conditions under the Ontario Electrical Safety Code. What catches homeowners off guard is not the equipment itself but whether the panel has the spare capacity to feed it.
Before you buy that hot tub or schedule the pool installation, have an electrician assess your panel. Finding out mid-project that you need a service upgrade is a frustrating way to spend the summer.
Upgrading from 100 to 200 amp service is one of the most future-proofing investments a homeowner can make. It creates headroom for air conditioning, pools and hot tubs, EV chargers, and the general electrification trend that's only accelerating in Ontario homes. It also matters at resale, since buyers and home inspectors increasingly treat 200 amp service as the modern standard.
An upgrade is licensed work involving your utility and an ESA inspection, so this is firmly professional territory. A licensed electrical contractor will assess your current load, plan the new service, coordinate the utility disconnect, and handle permits and inspection.
You don't need to be an electrician to do a basic capacity sanity check. Note what's running on a hot afternoon: AC, pool equipment, dehumidifier, laundry. If breakers trip under that normal summer load, or if you're planning to add anything with a motor or a heater to your home, it's time for a professional assessment.
Murtex Electric provides panel assessments, service upgrades, and dedicated circuit installations for homeowners across Toronto, Etobicoke, North York, Vaughan, Mississauga, Burlington, Oakville, Milton, and Caledon. If your panel is showing summer strain, contact us before the next heat wave puts it to the test.
