How To Prepare for a Heat Wave

Heat waves in Minnesota can put a surprising amount of pressure on your air conditioning system. When temperatures soar across Carlton, Duluth, Cloquet, and surrounding areas, your cooling equipment works much harder to keep indoor spaces comfortable. Preparing ahead of time helps reduce strain on your HVAC system and keeps your home or cabin consistently cool during extreme weather.

At Brent’s Heating & Cooling, we’ve served communities throughout Carlton County, St. Louis County, Pine County, and Lake County since 2003. We see firsthand how high heat affects residential HVAC systems, from older air conditioners to high-efficiency heat pumps and ductless mini splits. The following guide walks you through simple, effective steps to protect your cooling system before the next heat wave arrives.

These strategies are designed to support reliable comfort, reduce energy use, and help prevent breakdowns—no matter what kind of air conditioning or heat pump your home relies on.

Improve Indoor Airflow by Replacing HVAC Filters

Good airflow is one of the most important parts of maintaining efficient cooling, especially during extreme summer temperatures. Your air conditioner or heat pump works by moving warm air over indoor coils that pull heat out. If air can’t pass through your system freely, cooling cycles become longer and harder on the equipment.

That’s why replacing HVAC filters regularly is essential. During long stretches of hot weather in Northeast Minnesota, filters fill with dust, pollen, and debris much faster than many homeowners expect. When that buildup restricts airflow, performance drops and your cooling system has to work overtime.

Cleaning or replacing filters offers several key benefits:

• Improves airflow throughout your home
• Supports even, consistent cooling
• Reduces stress on motors and internal parts
• Helps maintain energy-efficient operation

Brent’s Heating & Cooling provides HVAC filter replacement services throughout Carlton, Duluth, Cloquet, and nearby areas for homeowners who prefer professional support. Whether you have a traditional AC, a ductless mini split, or a high-efficiency heat pump, clean filters make a noticeable difference during heat waves.

Clear Space Around Your Outdoor Condenser Unit

Your outdoor AC or heat pump condenser is responsible for releasing the heat your system removes from your indoor air. When vegetation, debris, or stored items crowd the unit, the system can’t get rid of that heat effectively. As a result, cooling capacity drops just when you need it most.

Before extreme heat rolls in, take a few minutes to inspect the area around your outdoor unit. Homeowners across Carlton County and the Duluth area often find grass clippings, branches, and seasonal buildup blocking airflow without even realizing it.

For optimal performance, make sure your system has:

• Two to three feet of space on every side
• Unobstructed clearance above the equipment
• No landscaping or debris touching the unit

Even minor restrictions can reduce cooling efficiency. Clearing the area helps your system release heat more easily, which becomes especially important during prolonged high temperatures.

Practice Smart Thermostat Habits All Summer

Many homeowners assume lowering the thermostat drastically will cool their home faster. In reality, HVAC systems cool at a steady pace. A much lower temperature setting simply forces the system to run longer, adding unnecessary wear without speeding up results.

Instead, aim for a comfortable, consistent temperature. Maintaining steady thermostat settings helps reduce strain on your system and supports energy-efficient cooling during the hottest days of the year.

A few simple thermostat habits can help:

• Avoid sudden, major temperature changes
• Keep settings stable throughout the day
• Use programmable or smart schedules if available

If you’re considering upgrading, Brent’s Heating & Cooling offers smart thermostat installation to help homeowners enjoy improved comfort and efficiency across Northern Minnesota.

What To Do During a Heat Wave

Preparation goes a long way, but once temperatures spike, a few small adjustments make a big difference in reducing heat load inside your home.

Minimize Indoor Heat Gain

Direct sunlight quickly increases indoor temperatures. Closing blinds, curtains, or shades during the brightest part of the day keeps extra heat out and helps your AC or heat pump maintain target temperatures more easily.

Use Ceiling Fans to Support Air Circulation

While ceiling fans don’t cool the air itself, they help move conditioned air throughout your home. This added circulation improves comfort and supports more efficient cooling system performance.

Limit Heat-Producing Activities

Ovens, stovetops, and dryers introduce additional heat into your home. During peak afternoon temperatures, consider reducing or rescheduling these activities to lighten your cooling load.

Keep Interior Doors Open

Allowing air to move freely between rooms helps your HVAC system maintain balanced cooling. Open interior doors can prevent hot spots and promote even airflow throughout your home or cabin.

Schedule Preventive HVAC Maintenance

Routine maintenance is one of the most effective ways to prepare for seasonal heat. Although HVAC filter replacement and outdoor unit cleanup can be handled by most homeowners, a full-system tune-up provides deeper protection.

During professional maintenance, Brent’s Heating & Cooling technicians typically:

• Check refrigerant charge
• Inspect electrical components
• Clean outdoor coils
• Test system controls
• Verify adequate airflow

Minor issues that go unnoticed in spring can quickly become major problems during a heat wave. Preventive maintenance catches developing concerns early and helps ensure reliable cooling performance all summer long.

Seal Air Leaks to Improve Cooling Efficiency

Your cooling system’s effectiveness also depends on how well your home retains conditioned air. Gaps around windows, doors, or attic spaces allow cold air to escape and let warm air seep in.

Sealing air leaks can help:

• Maintain steady indoor temperatures
• Reduce overall cooling demand
• Lower energy usage
• Improve comfort throughout your home

Even small improvements can significantly reduce wear on your system when outdoor temperatures reach extreme levels.

Why Preparing for a Heat Wave Matters

Heat waves place constant pressure on cooling systems across our region. The longer your air conditioner or heat pump runs without a break, the more wear the internal components experience. Preparing your home helps reduce stress on your system and increases the chances of dependable cooling during high-demand periods.

By focusing on airflow, clearing space around your outdoor equipment, practicing smart thermostat habits, and reducing indoor heat gain, you help your system run more efficiently—even on the hottest days of the year.

Be Ready Before Temperatures Rise

Extreme heat can move in quickly. Taking steps now—before a heat wave starts—helps minimize the risk of unexpected breakdowns. Replace filters, clear your outdoor condenser, and double-check your thermostat settings to ensure your system is ready for the season.

If you’d like professional help preparing your AC, heat pump, or ductless mini split, Brent’s Heating & Cooling offers preventive HVAC maintenance throughout Carlton, Duluth, Cloquet, and surrounding communities. For questions or to schedule service, call us at (218) 390-1479 or visit our website to request an appointment.