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Vacation-Proof Your HVAC: How to Prep Your System Before Leaving Town This Summer

July 22, 2025

All you need to know before leaving town!

Summer in the Tri-Cities means warm weather, high humidity—and much-needed getaways to the lake, beach, or mountains. But before you pack your bags and hit the road, don’t forget one essential item on your pre-vacation checklist... Your HVAC system! We know how East Tennessee’s summer heat can take a toll on your home, especially when you're not there to keep an eye on things. Taking a few smart steps to prep your system before you leave can help protect your comfort, energy bills, and HVAC investment while you're away. Keep your home, animals, and contents safe while you are out of town bu following these succinct steps!


Why Vacation-Proofing Your HVAC Matters

Leaving your system unchecked for several days or weeks can lead to:


  • Higher energy bills from inefficient settings
  • System stress during extreme heat waves
  • Unexpected breakdowns while you're gone
  • Humidity buildup, which can lead to mold or musty odors


Don’t come home to a sauna or surprise repair bill—use this guide to make sure your HVAC system is ready to handle your absence.


1. Set Your Thermostat for Vacation Mode

Resist the urge to turn off your AC entirely. In East Tennessee’s humid climate, that can quickly lead to moisture buildup, mold, or damage to wood floors and furniture.


🔧 Recommended Setting: Set your thermostat to 78–82°F while you’re gone. This keeps humidity in check without overworking your system. If you have a smart thermostat, use vacation mode or schedule settings so it can resume normal cooling just before you return home.


2. Check and Replace the Air Filter

A clean air filter ensures good airflow and helps your system run efficiently while you’re away. A dirty filter can force the AC to work harder, increasing wear and tear—even if no one’s home.


📅 If it’s been more than 30 days since your last filter change, now’s the time.


3. Seal Windows and Close Curtains

Sunlight streaming through windows adds unwanted heat. Closing blinds or curtains can reduce indoor temps by as much as 30%, according to the U.S. Department of Energy.


🪟 Bonus Tip: Check for drafts or air leaks around windows and doors to prevent cool air from escaping while you’re away.


4. Unplug Heat-Producing Electronics

Devices like TVs, lamps, and computers produce heat—even in standby mode. Unplugging them not only protects against power surges but reduces heat your AC has to combat.


5. Schedule a Pre-Vacation HVAC Check-Up

If your system has been running nonstop this summer (and let’s face it, it has), it’s wise to get it inspected before you leave. Our technicians at Phil’s Heating and Air can:


  • Ensure your system is operating safely and efficiently
  • Check refrigerant levels and drain lines
  • Clean coils and inspect components
  • Alert you to any signs of wear or potential breakdowns


🛠️ A quick tune-up now could save you from coming home to a costly repair—or worse, no AC at all.


6. Consider Installing a Smart Thermostat or HVAC Monitor

With a smart thermostat, you can monitor and adjust your home’s temperature remotely from your phone. Some systems even alert you if indoor temps rise unexpectedly—helpful if your AC stops working during a heat wave.


📲 Ask Phil’s about models we recommend and install for East TN homes.


7. Secure Outdoor HVAC Equipment

Storms can pop up unexpectedly in the mountains during summer. Be sure to:


  • Trim nearby branches or bushes
  • Check that your outdoor unit is clear of debris
  • Ensure your surge protector is in working order


Peace of Mind Starts with Preparation

A little planning goes a long way when it comes to protecting your home and HVAC system while you're out enjoying your summer vacation. Whether you’re away for a weekend or a few weeks, these simple steps will help your system stay safe, efficient, and ready to welcome you back to a cool, comfortable home.


Let Phil’s Heating and Air Help You Vacation-Proof Your System

Serving Gray, Johnson City, Kingsport, Bristol, and surrounding areas, we’re your trusted local experts for everything from seasonal tune-ups to smart thermostat installation. Get your home ready for your time away—book your appointment with Phil’s today.


📞 Call us or schedule online! (423) 741-3394

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