What is the ideal thermostat setting for saving energy in summer?

For optimal energy savings, aim to set your thermostat around 24-25°C (75-77°F) when you're home. When away, you can set it even higher to 27-28°C (80-82°F) to prevent your AC from overworking.

How often should I change my AC filter?

You should check your AC filter monthly and replace it every 1 to 3 months, or more frequently if you have pets or allergies, to ensure optimal airflow and efficiency.

Do ceiling fans actually help lower energy bills?

Yes, ceiling fans create a wind-chill effect, making you feel cooler without actually lowering the room temperature. This allows you to set your thermostat a few degrees higher, reducing the workload on your air conditioner and saving energy.

Why is fall a good time to think about summer cooling tips?

Fall is an ideal time to reflect on past energy consumption and plan for future savings. It's also a great season to schedule professional AC maintenance for next spring, ensuring your system is ready for efficient operation when summer returns.

How can Mt. Hope Heating & Cooling help me save on energy bills?

Mt. Hope Heating & Cooling offers professional HVAC maintenance, tune-ups, and energy-efficient system installations that ensure your cooling and heating systems run optimally, reducing energy consumption and lowering your utility bills.

Beat the Heat & Bills: Hamilton's Top Summer Cooling Tips

September 13, 2026 · 6 min read · Mt. Hope Heating and Cooling Ltd.

Friendly Mt. Hope Heating & Cooling technician adjusting an outdoor AC unit in a Hamilton suburban home, with a branded service van in the background.

As the crisp air of fall settles over Hamilton, bringing with it the vibrant colours of changing leaves and the promise of cozy evenings, it’s natural to shift our focus from cooling to heating. Yet, this season of transition is also the perfect time to reflect on the past summer and prepare for the next. Did those sweltering July and August days leave you sweating over surprisingly high energy bills? You’re not alone. Many Ontario homeowners experience this annual dilemma.

At Mt. Hope Heating & Cooling, your trusted, family-run HVAC experts in Hamilton with over 40 years of experience, we believe that a comfortable home shouldn't come at an exorbitant cost. While we’re busy helping our neighbours prepare their furnaces for the colder months ahead, we also know that planning for future energy efficiency is always a smart move. That’s why we’ve put together a comprehensive guide of summer cooling tips designed to help you lower your energy bills when the warm weather returns, ensuring your home stays comfortable without breaking the bank.

Understand Your Cooling System's Role

Your air conditioning system is often the biggest energy consumer during the summer months. Maximizing its efficiency is key to significant savings. But it's not just about the AC unit itself; it's about how your entire home works in conjunction with it.

1. Master Your Thermostat Settings

Go Smart: If you haven't already, consider upgrading to a smart thermostat. These devices learn your preferences, can be controlled remotely, and optimize cooling schedules to save energy. Many even qualify for local rebates!
Find the Sweet Spot: While it's tempting to blast the AC, setting your thermostat too low forces your system to work harder and longer. Aim for a comfortable yet energy-efficient temperature, typically around 24-25°C (75-77°F) when you're home. When you're away, you can set it even higher to 27-28°C (80-82°F) to save substantially.
Use the 'Auto' Setting: Keep your fan setting on 'Auto' rather than 'On'. 'Auto' ensures the fan only runs when the cooling system is actively conditioning the air, saving electricity.

2. Prioritize Regular HVAC Maintenance

This is perhaps the most crucial tip, and it’s where Mt. Hope Heating & Cooling shines. Just like your car, your air conditioner needs regular tune-ups to run efficiently and prevent costly breakdowns. Fall is an excellent time to think about scheduling your AC tune-up for next spring, or even a pre-winter furnace check-up now!

Annual Professional Tune-Up: Schedule a professional AC inspection and cleaning every spring. Our certified technicians will clean coils, check refrigerant levels, inspect electrical components, and ensure everything is running optimally. A well-maintained system uses less energy and lasts longer.
Change Filters Regularly: A clogged air filter restricts airflow, making your system work harder and consume more energy. Check your filter monthly and replace it every 1-3 months, or more frequently if you have pets or allergies.
Keep Outdoor Unit Clear: Ensure the outdoor condenser unit is free from dirt, leaves, and debris. Clear away any foliage or obstructions within a two-foot radius to allow for proper airflow.

3. Optimize Your Home's Envelope

Your home’s structure plays a significant role in how well it retains cool air.

Seal Air Leaks: Drafts aren't just a winter problem. In summer, they let cool air escape. Seal gaps around windows, doors, and utility penetrations with caulk or weatherstripping. This is an easy, inexpensive DIY project that yields big returns.
Boost Insulation: Properly insulated attics, walls, and crawl spaces prevent heat from infiltrating your home during the summer and escaping during the winter. Consider an energy audit to identify areas needing improvement.
Upgrade Windows: Energy-efficient windows with low-E coatings can significantly reduce heat transfer. If new windows aren't in the budget, use heavy curtains or blinds to block direct sunlight during the hottest parts of the day.

4. Manage Heat-Generating Appliances

Every appliance that generates heat contributes to your home's internal temperature, forcing your AC to work harder.

Cook Smart: Use your microwave, slow cooker, or outdoor grill instead of your oven and stovetop during hot days. If you must use them, run your kitchen exhaust fan to vent heat and humidity.
Laundry & Dishwashing: Run your dishwasher and washing machine during cooler evening hours. Air dry clothes when possible to avoid using a heat-generating dryer.
Unplug Electronics: Many electronics draw 'phantom' power and generate heat even when turned off. Unplug chargers and devices not in use.

5. Harness the Power of Fans

Fans don't cool a room like an AC, but they create a wind-chill effect on your skin, making you *feel* cooler. This allows you to set your thermostat a few degrees higher.

Ceiling Fans: Ensure your ceiling fans are rotating counter-clockwise in the summer to push air down, creating a cooling breeze. Turn them off when you leave the room to save energy.
Window Fans: In the evening, if the outside air is cooler than inside, use a window fan to pull cool air in and exhaust warmer air out.

6. Strategic Landscaping and Shading

Outdoor elements can be powerful allies in your battle against summer heat.

Plant Trees and Shrubs: Deciduous trees planted on the west and east sides of your home can provide excellent shade during the summer, reducing direct sun exposure and heat gain. They'll lose their leaves in fall, allowing winter sun to warm your home.
Install Awnings: Awnings over south-facing windows can block significant solar heat without obstructing your view.

Looking Ahead: Preparing for Next Summer (and This Winter!)

While summer feels like a distant memory, applying these tips now means you’ll be well-prepared when the heat returns. Fall is also the ideal time to ensure your heating system is ready for winter. A comprehensive furnace tune-up by Mt. Hope Heating & Cooling can prevent unexpected breakdowns and keep your home cozy and energy-efficient through the colder months.

Whether you're looking to optimize your cooling for next year, need a furnace check-up, or are considering a new, energy-efficient HVAC system, our experienced team is here to help. We proudly serve homeowners across Hamilton, Ancaster, Dundas, Stoney Creek, Burlington, Grimsby, Waterdown, Binbrook, Oakville, Milton, Brantford, and Caledonia, bringing over four decades of trusted, family-run service to your doorstep.

Ready to Save on Your Energy Bills?

Don't wait until next summer's heatwave to think about your cooling costs. Start planning now for a more comfortable and affordable home year-round. For expert advice, professional HVAC service, or to schedule a maintenance appointment, reach out to the team at Mt. Hope Heating & Cooling.

Call us today at 905-679-0101 or visit us online at mthopehvac.com. We're always happy to help our neighbours achieve optimal home comfort and efficiency!

summer cooling tipsenergy billsHVAC HamiltonAC maintenancehome comfortOntario