Does running AC all night increase my hydro bill a lot?

Running your AC all night will increase your hydro bill, but the impact depends on your usage habits, home efficiency, and Ontario's time-of-use electricity rates. The key is finding the right balance between comfort and cost.

Time-of-Use Rates Work in Your Favor
In Ontario, electricity is cheapest during off-peak hours (7 PM to 7 AM on weekdays, plus all weekend), when most people run their AC at night. You'll pay around 8.7¢/kWh during these hours versus 12.8¢/kWh during peak times. This means running your AC overnight is actually more economical than running it during hot afternoons.

Smart Temperature Management
Rather than turning your AC off completely at night, set your thermostat 2-3 degrees higher than your daytime setting. For example, if you keep it at 22°C during the day, try 24-25°C at night. Your body naturally cools while sleeping, so you'll likely stay comfortable while reducing energy consumption by 10-20%. A programmable or smart thermostat can handle these adjustments automatically.

Ottawa's Climate Considerations
During Ottawa's humid summers, running AC overnight also helps control moisture levels, preventing that sticky feeling that can disrupt sleep. Many Ottawa homeowners find that maintaining consistent temperatures (rather than turning the system on and off) actually uses less energy because the AC doesn't have to work as hard to cool down a hot house.

Typical Costs for Ottawa Homes
A central AC system typically uses 3-5 kW per hour. Running it for 8 hours overnight at off-peak rates would cost roughly $2-4 per night, or $60-120 per month during peak summer. Proper insulation, clean filters, and regular maintenance can significantly reduce these costs.

Energy-Saving Tips
Keep your AC running efficiently by changing filters monthly during heavy use, ensuring vents aren't blocked, and scheduling annual maintenance. A well-maintained system uses 15-20% less energy than a neglected one.

For a professional assessment of your AC's efficiency or to discuss upgrading to a more energy-efficient system, Ottawa HVAC Pro offers free consultations to help Ottawa homeowners optimize their cooling costs.

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