Is Your AC Running at Peak Performance?

An efficient air conditioner keeps your home comfortable, controls humidity, and doesn’t quietly drain your bank account. A typical household’s energy bill runs about $1,900 a year, and almost half of that goes to heating and cooling.

Here’s how to tell if your AC is performing at its best, what preventive maintenance includes, and when it’s time to think about replacement.

Signs Your AC Isn’t Running at Peak Performance

Most homeowners don’t think about their AC until something feels off. Here are the warning signs worth paying attention to:

• Higher-than-normal energy bills, month over month or year over year
• Uneven cooling with some rooms 5+ degrees warmer than others
• System running longer than usual to reach the temperature you set
• Unusual noises like grinding, screeching, or banging
• Musty or burning smells when the system kicks on
• Frequent cycling on and off during the same hour
• Indoor humidity that feels sticky even when the thermostat reads 72

Any one of these on its own is not necessarily cause for alarm. Multiple signs together usually mean the system needs a professional diagnostic check.

Understanding SEER2 and Energy Efficiency

SEER2 is the current federal efficiency rating for residential air conditioners. It replaced the older SEER rating in January 2023, when the Department of Energy updated both the testing methodology and the minimum efficiency standards for new equipment.

Two practical things to know:

• A SEER2 rating on a new unit isn’t directly comparable to the SEER rating on an older one. Testing conditions on the new scale are stricter, so the same equipment tests lower under SEER2 than it would have under the old SEER. Comparing a 15-year-old system’s original SEER rating to a new SEER2 spec sheet will make the new unit look less efficient than it actually is.
• A higher SEER2 rating means lower cooling bills. Federal minimums are set higher in southern climate zones than in northern ones like Minnesota, and above the minimum, each step up on the SEER2 scale improves efficiency at a higher upfront cost. Most homeowners weigh how heavily they run the AC against how quickly a higher-efficiency unit pays for itself.

A licensed installer can walk you through which SEER2 rating fits your specific home and budget during an in-home consultation.

Why Professional Installation Matters for Long-Term Performance

Even the most efficient AC on the market can underperform if the installers cut corners. Improper installation can reduce your AC’s efficiency by up to 30 percent and can also shorten equipment life.

A professional installation covers steps that a DIY or unlicensed job typically skips:

• A detailed load calculation to confirm the system is properly sized for your home
• Proper refrigerant charge and vacuum evacuation of the lines
• Sealed ductwork with pressure testing
• Correct electrical connections and disconnect wiring
• Obtaining local permits and municipal inspections

Getting the installation right matters as much as choosing efficient equipment. A system that’s oversized, undersized, or poorly installed loses efficiency from day one and often needs replacement years sooner than one that was done correctly.

Preventive Maintenance: What It Includes and How Often to Schedule It

Regular maintenance is one of the best investments you can make for your AC. Airflow problems alone can drop system efficiency by up to 15 percent, and that’s just one of the issues an annual tune-up catches early.

A proper maintenance visit covers:

• Air filter inspection or replacement
• Evaporator and condenser coil cleaning
• Refrigerant charge verification
• Electrical connection tightening
• Capacitor testing
• Blower motor and airflow check
• Condensate drain flush
• Thermostat calibration

Schedule maintenance once a year, ideally in spring before the first hot stretch. Most manufacturers require annual professional service to keep the warranty active.

When to Consider Replacing an Inefficient System

At some point, the cost of keeping an aging AC running outweighs the cost of replacing it. Here’s how to tell if you’re at that stage:

• System is 15 or more years old
• Repairs in the past 12 months total 50% or more of what a replacement would cost
• R-22 refrigerant is required for any repair, which is significantly more expensive since the EPA phased it out in 2020
• Energy bills climb every year despite regular maintenance

An aging AC quietly costs more every year, even when nothing has broken yet. Replacing old heating and cooling equipment with certified models cuts an annual energy bill by nearly $140.

Frequently Asked Questions

How can I tell if my AC needs maintenance?

If more than 12 months have passed since the last professional visit, it’s time. Warning signs like higher bills, uneven cooling, longer cycles, or new noises are all reasons to schedule sooner rather than later.

How often should I service my AC?

Once a year for professional maintenance, ideally in spring. Change the filter at home every 1 to 3 months during the cooling season, or monthly for homes with pets or allergies.

When is a new AC worth the cost?

Replacement usually makes sense when repairs over the past 12 months total 50% or more of the replacement cost, when the system is 15 or more years old, or when it runs on R-22 refrigerant. If your energy bills have been climbing every summer despite regular maintenance, that’s often the clearest sign it’s time to replace.

Should I upgrade my thermostat too?

An ENERGY STAR certified smart thermostat can save approximately $100 a year, especially in homes with high heating and cooling bills or those that sit empty during weekdays.

Does sealing air leaks really make a difference?

Yes. Sealing air leaks and adding insulation can provide up to 10 percent savings on annual energy bills, and it makes the AC’s job easier at the same time.

Schedule AC Service with Hero Today

Whether it’s a quick tune-up, a system diagnostic check, or a full high-efficiency upgrade, Hero Home Services is ready to help. We’ve been keeping Twin Cities homes comfortable since 1914. Call or text us to schedule AC maintenance or an in-home consultation.