Ask the Energy Expert

One of the most common questions we get this time of year is about leaving home for vacation or the season. The wrong A/C settings could be costing you—by overworking your system, creating humidity problems or leading to costly repairs. Here’s how to keep your A/C running efficiently while you’re away.

The best temperature setting while you’re away

Should you turn your A/C off while you’re gone? No—but setting it too low wastes energy and setting it too high can create humidity problems. The ideal setting depends on how long you’ll be away:

• Short trips (a few days): Set your thermostat to 80°F to reduce strain while preventing excess heat buildup.
• Longer vacations (weeks): Set it to 82°F to balance efficiency and home protection.
• Seasonal residents: If leaving for months, keep the A/C set around 78–82°F and consider using a dehumidifier or a smart thermostat for remote adjustments.

Pro tip: Close blinds and curtains to block out direct sunlight and help maintain a stable indoor temperature.

A/C maintenance before you leave

A well-maintained A/C runs more efficiently, lasts longer, and prevents costly breakdowns. Before you go:

• Replace or clean your air filter to ensure proper airflow and avoid extra strain on the system.
• Clear leaves, dirt, and debris around the outdoor unit to improve efficiency.
• Inspect refrigerant lines and ductwork for leaks that could cause cooling inefficiencies.
• Check the drain line to prevent clogs that could lead to water damage or mold growth.
• Schedule an A/C tune-up before a long trip—professionals can catch small issues before they turn into expensive repairs.

Is it time to upgrade your A/C?

If your A/C is struggling to keep up, upgrading before a long trip could prevent issues while you’re gone. Signs it’s time for a replacement include:

• Frequent repairs — if you’re calling for service more than once a year, it may be more cost-effective to upgrade.
• Inconsistent cooling or humidity problems—newer units are better at regulating both.
• High energy bills — modern A/C units are far more energy-efficient, saving you money
• System age—if your A/C is over 10 years old, you could start seeing some issues.

Considering an upgrade? A high-efficiency A/C system with a smart thermostat can save energy, improve comfort, and allow for remote temperature control while you’re away.  If you buy a new, energy-efficient A/C, you can receive up to $2,150 with our rebate and federal tax credits.

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Seasonal residents: How to prevent humidity issues

For those leaving home for months at a time, humidity control is just as important as temperature settings. High humidity can cause mold and mildew, while low humidity can dry out wood floors and furniture.

• Set the A/C to cycle periodically to keep humidity levels below 60%.
• Use a dehumidifier in humid climates to prevent moisture buildup.
• Keep interior doors open to allow better air circulation.