Top 5 Questions About High Energy Bills & Air Conditioning We Got This Week (And Why Your Utility Bill Keeps Going Up Every Summer)

One of the most common reasons homeowners call us during the cooling season isn’t because their air conditioner has completely stopped working—it’s because their electric bill suddenly skyrocketed.

This week alone, we spoke with homeowners throughout Gastonia, Charlotte, Belmont, Mount Holly, Denver, Huntersville, Cornelius, Lake Wylie, Fort Mill, Rock Hill, and surrounding communities who were concerned about rising cooling costs.

The truth is that your air conditioner may not be the only culprit. Your home’s insulation, ductwork, thermostat settings, humidity levels, and even simple maintenance habits can all affect energy consumption.

Here are the Top 5 Questions About High Energy Bills & Air Conditioning We Got This Week, along with expert answers from our HVAC team.

1. Why Did My Electric Bill Double This Summer?

This is arguably the most common HVAC-related question homeowners ask online.

If your utility bill suddenly jumps, your air conditioner is often the first place to investigate.

Common Causes of High Summer Energy Bills

Dirty Air Filters

Restricted airflow forces your system to run longer and work harder.

Dirty Condenser Coils

When the outdoor unit cannot efficiently release heat, energy consumption increases.

Low Refrigerant

A refrigerant issue often causes longer run times and reduced cooling capacity.

Aging Equipment

Older systems generally consume more energy than modern high-efficiency equipment.

Poor Attic Insulation

Many homeowners blame the air conditioner when excessive heat is actually entering through the attic.

Air Leaks

Gaps around doors, windows, and penetrations can significantly increase cooling demand.

Questions To Ask Yourself

• Has my system been serviced recently?
• Is the unit cooling normally?
• Has my thermostat setting changed?
• Have energy rates increased?
• Has the weather been hotter than normal?

Many times, the answer involves multiple factors rather than a single problem.

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2. What Temperature Should I Set My Thermostat During Summer?

This question generates endless debate online.

Some homeowners keep their thermostat at 68°F.

Others set it at 78°F or higher.

The ideal setting depends on your comfort preferences, home efficiency, and energy goals.

Recommended Thermostat Settings

Many energy-efficiency experts recommend:

78°F While Home

Higher While Away

However, every family is different.

What Happens When You Lower The Thermostat?

For every degree lower you set your thermostat:

• Cooling demand increases
• Run times increase
• Energy consumption increases

Going from 78°F to 72°F may seem minor, but it can significantly impact operating costs.

Common Misconception

Many homeowners believe setting the thermostat dramatically lower cools the house faster.

In reality, most systems cool at roughly the same rate regardless of how low the thermostat is set.

The system simply runs longer.

Smart Thermostats Help

Modern smart thermostats can:

• Automatically adjust temperatures
• Reduce unnecessary run times
• Improve comfort
• Lower energy consumption

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3. Do Smart Thermostats Actually Save Money?

This question appears constantly on homeowner forums and HVAC discussion boards.

The short answer:

Yes—when used properly.

How Smart Thermostats Save Energy

Scheduling

The system automatically adjusts temperatures when nobody is home.

Learning Behavior

Some models adapt to your family’s schedule.

Remote Access

You can adjust temperatures from anywhere.

Energy Reports

Many systems provide usage insights and recommendations.

Common Example

Instead of maintaining 72°F while you’re at work for eight hours, a smart thermostat may allow the home to drift slightly warmer and then begin cooling before you arrive home.

This often reduces overall cooling costs.

Who Benefits Most?

Smart thermostats typically provide the greatest savings for:

• Families with predictable schedules
• Homes that sit empty during work hours
• Homeowners who frequently forget thermostat adjustments

Additional Benefits

Many homeowners also appreciate:

• Better comfort
• Improved humidity control
• Remote monitoring
• Maintenance reminders

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4. Does Closing Air Vents Save Money?

This is one of the most persistent HVAC myths.

Many homeowners assume closing vents in unused rooms reduces energy consumption.

Unfortunately, that’s not usually how residential HVAC systems work.

Why Closing Vents Can Backfire

Most air conditioning systems are designed around a specific airflow requirement.

Closing vents may:

• Increase static pressure
• Reduce airflow
• Cause comfort issues
• Increase system strain
• Reduce efficiency

What Happens Instead?

The system still produces the same amount of conditioned air.

The airflow simply becomes restricted.

Think of it like partially blocking a garden hose.

The pressure changes, but you’re not necessarily improving efficiency.

Better Ways To Save Energy

Instead of closing vents:

✓ Replace filters regularly

✓ Schedule annual maintenance

✓ Improve insulation

✓ Seal duct leaks

✓ Install a smart thermostat

✓ Upgrade aging equipment

Exceptions

Certain zoning systems are specifically designed to manage airflow between areas of the home.

If your home has zoning controls, the recommendations may differ.

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5. Is My Old Air Conditioner Costing Me Money?

In many cases, yes.

Homeowners often focus on repair costs while overlooking energy costs.

An older system may still operate—but that doesn’t necessarily mean it’s operating efficiently.

Signs An Older System May Be Costing More To Operate

Increasing Utility Bills

Even without major repairs, efficiency may decline over time.

Longer Run Cycles

The system works harder to maintain comfort.

Frequent Repairs

Small repair costs add up quickly.

Uneven Temperatures

Older equipment often struggles to maintain consistent comfort.

Understanding Efficiency Ratings

Modern systems generally offer significantly higher efficiency than systems installed 10-20 years ago.

Newer systems often provide:

• Lower operating costs
• Improved humidity control
• Better airflow
• More consistent temperatures
• Quieter operation

When Replacement May Make Sense

If your system is:

• 12-15+ years old
• Experiencing frequent repairs
• Struggling to cool effectively
• Causing unusually high energy bills

A replacement evaluation may be worthwhile.

The Hidden Cost Of Waiting

Many homeowners focus on avoiding replacement costs while overlooking years of excess utility expenses.

Sometimes the most expensive system is the one that’s technically still working.

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Bonus Question: Why Does My House Feel Humid Even When The AC Is Running?

This question has become increasingly common in the Carolinas.

Humidity affects comfort just as much as temperature.

Potential Causes

• Oversized equipment
• Dirty evaporator coils
• Airflow issues
• Duct leakage
• Aging equipment
• Thermostat settings

Why Humidity Matters

Higher humidity often causes homeowners to lower the thermostat unnecessarily.

As a result:

• Energy usage increases
• Utility bills rise
• Comfort may still suffer

Proper humidity control often allows homeowners to remain comfortable at higher thermostat settings.

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