Vacation-Proof Your HVAC System: A Homeowner’s Guide to Saving Energy and Avoiding Summer Surprises

Summer is vacation season. Whether you’re heading north to a cabin, taking a road trip with the family, or escaping to the beach for a week, preparing your home before you leave can help prevent unexpected problems and keep your energy bills under control while you’re away.

One of the most overlooked items on a vacation checklist is your HVAC system. Many homeowners either leave their air conditioning running exactly as they normally would or shut it off completely. Neither option is ideal.

At Badger Heating & Air Conditioning, we often receive calls from homeowners returning from vacation to a hot, humid home, clogged drain lines, frozen systems, or unexpected repair needs. The good news is that a little preparation before you leave can help protect your comfort, your home, and your wallet.

Here’s what we recommend doing before, during, and after your summer vacation to keep your HVAC system operating efficiently.

Why You Shouldn’t Turn Your Air Conditioner Off Completely

One of the biggest HVAC myths is that turning your air conditioner completely off while you’re away will save the most money.

In reality, doing so can create several problems.

Without any cooling or humidity control, indoor temperatures and moisture levels can rise significantly. Excess humidity can contribute to:

• Mold and mildew growth
• Warped wood flooring and furniture
• Damaged electronics
• Musty odors
• Increased strain on your HVAC system when it has to cool the home back down

Instead, experts generally recommend raising your thermostat rather than shutting the system off entirely. Many HVAC professionals suggest setting the thermostat between 80°F and 85°F during summer vacations to balance energy savings and humidity control. 

Before You Leave: Your HVAC Vacation Checklist

1. Replace Your Air Filter

A dirty air filter restricts airflow and forces your system to work harder.

If you’re leaving for more than a few days, install a fresh filter before you go. This simple step helps:

• Improve efficiency
• Maintain airflow
• Reduce wear and tear
• Improve indoor air quality

If you can’t remember the last time you changed your filter, now is definitely the time.

2. Adjust Your Thermostat

Your thermostat setting will have the greatest impact on your energy use while you’re away.

The U.S. Department of Energy recommends thermostat setbacks as one of the easiest ways to reduce cooling costs. In fact, homeowners may save around 10% annually by adjusting temperatures when they’re away from home.

A good rule of thumb:

• If you normally keep your home at 72°F to 75°F, raise the temperature to 80°F to 85°F while you’re gone.
• Use your thermostat’s “Vacation Mode” if available.
• If you have a smart thermostat, schedule it to begin cooling the home several hours before you return.

3. Set Your Fan to AUTO

Many homeowners unknowingly leave the fan set to “ON.”

When the fan runs continuously:

• Energy use increases
• Humidity can be redistributed throughout the home
• Cooling costs rise

Switching the fan to AUTO allows it to run only when cooling is needed, which is typically more efficient.

4. Check Your Condensate Drain

Summer humidity means your air conditioner produces a significant amount of condensation.

A clogged condensate drain can cause:

• Water damage
• System shutdowns
• Overflow issues

Before leaving:

• Inspect the drain line
• Make sure water is flowing properly
• Consider pouring a small amount of vinegar into the line if recommended by your HVAC technician

5. Clear Around Your Outdoor Unit

Take a few minutes to inspect your outdoor condenser.

Remove:

• Grass clippings
• Weeds
• Leaves
• Branches
• Debris

Proper airflow around the unit improves efficiency and reduces unnecessary strain.

Ideally, maintain at least two feet of clearance around the equipment.

6. Close Blinds and Curtains

Your HVAC system doesn’t work alone.

Reducing solar heat gain can dramatically lower indoor temperatures while you’re away.

Before leaving:

• Close blinds
• Shut curtains
• Lower shades on south- and west-facing windows

This simple step can reduce the amount of heat entering your home throughout the day.

7. Schedule Preventive Maintenance Before Vacation Season

If your system hasn’t been serviced recently, vacation season is a great reminder to schedule maintenance.

A professional tune-up can identify:

• Low refrigerant levels
• Electrical issues
• Dirty coils
• Drainage concerns
• Potential component failures

It’s much better to discover these issues before leaving than after returning home to a system that won’t cool.

Our residential HVAC maintenance services help homeowners stay ahead of costly repairs while maximizing efficiency and system lifespan.

While You’re Away: Smart Monitoring Tips

Use a Smart Thermostat

If your home has a smart thermostat, you can monitor conditions remotely.

Many modern thermostats allow you to:

• View indoor temperatures
• Adjust settings from your phone
• Receive alerts if temperatures become extreme
• Detect HVAC issues early

ENERGY STAR estimates that certified smart thermostats can save homeowners an average of 8% on heating and cooling costs.

Ask Someone to Check on Your Home

If you’ll be gone for more than a week, consider asking a trusted neighbor, friend, or family member to stop by.

Have them check:

• Indoor temperature
• Thermostat operation
• Water leaks
• Unusual noises
• Signs of power outages

Early detection can prevent minor issues from becoming major repairs.

Don’t Forget Humidity

Wisconsin summers can bring high humidity.

Even if temperatures aren’t extreme, excess moisture can cause problems.

Your air conditioning system does more than cool – it also removes humidity. That’s another reason why shutting it off completely is generally not recommended.

Returning Home: What to Do After Vacation

Resist the Urge to Crank the Thermostat Down

Many homeowners return home and immediately set the thermostat to 65°F hoping to cool the house faster.

Unfortunately, air conditioners don’t work that way.

Your system cools at the same rate regardless of how low you set the thermostat. Setting it excessively low simply forces the unit to run longer.

Instead:

• Set the thermostat to your normal comfort setting
• Allow the system to cool gradually
• Be patient while temperatures stabilize

Listen for Unusual Sounds

After being away, pay attention to your HVAC system.

Watch for:

• Unusual noises
• Weak airflow
• Excessive run times
• Warm air coming from vents
• Water around the indoor unit

These may indicate an issue that developed while you were gone.

Check Your Air Filter Again

Depending on local conditions and how long you were away, your filter may have collected dust, pollen, or debris.

Inspect it after your return and replace it if necessary.

Evaluate Your Energy Usage

If you have access to utility monitoring or smart thermostat reports, review how your home performed while you were away.

You may discover opportunities to save even more energy during future vacations.

Bonus Tip: Consider Upgrading to a Smart Thermostat

If you’re still using a manual thermostat, vacation season is an excellent time to upgrade.

Benefits include:

• Remote access
• Vacation scheduling
• Energy reports
• Automatic temperature adjustments
• Improved efficiency

The Department of Energy notes that properly managing thermostat setbacks can significantly reduce heating and cooling expenses, making smart thermostats one of the simplest upgrades for many homeowners. 

Enjoy Your Vacation Without Worrying About Your HVAC System

A little preparation before leaving can help you avoid expensive surprises, reduce energy consumption, and extend the life of your equipment.

Before your next summer getaway, remember these essentials:

✓ Change your air filter
✓ Raise your thermostat setting
✓ Leave the AC running—not off
✓ Clear debris from outdoor equipment
✓ Check your condensate drain
✓ Close blinds and curtains
✓ Consider smart thermostat monitoring
✓ Schedule HVAC maintenance if it’s overdue

At Badger Heating & Air Conditioning, we’re committed to helping Wisconsin homeowners stay comfortable all summer long. Whether you need preventive maintenance, AC repairs, or a complete system replacement, our team is here to help ensure your home stays cool and efficient – even when you’re miles away enjoying a well-earned vacation.

Need an AC tune-up before your next trip? Contact Badger Heating & Air Conditioning today to schedule residential HVAC maintenance and travel with peace of mind.