When you shop for a new air conditioner, one number shows up on almost every quote: the SEER rating. But what does it actually mean? How high is high enough for a Texas home? And why do newer systems now show a “SEER2” rating instead?

Whether you call it an AC or an aircon, SEER ratings work the same way. This guide explains AC efficiency ratings in plain language. You will find an AC SEER rating chart, current minimum requirements for Texas, estimated savings when you upgrade, and practical advice on choosing the right SEER rating for your home in Spring, TX.

What Is a Good SEER Rating for an AC? The Short Answer

SEER (Seasonal Energy Efficiency Ratio) measures how efficiently an air conditioner cools over a typical season. A higher SEER rating means less electricity for the same cooling. Since 2023, new systems are rated with SEER2, a newer and more realistic test. In Texas, new split-system central air conditioners must meet at least 14.3 SEER2 (about 15 SEER) for most home-sized units. For many Spring, TX homes, a system around 15 to 17 SEER2 offers a strong balance of cost and savings, while 18+ SEER2 variable-speed systems offer the highest efficiency and humidity control.

What Is a SEER Rating?

SEER compares how much cooling an air conditioner provides with how much electricity it uses over an entire cooling season.

SEER = total cooling output (BTUs) ÷ total electricity used (watt-hours)

A 16 SEER air conditioner delivers more cooling per unit of electricity than a 13 SEER unit. SEER ratings are a lot like miles per gallon for a car: the higher the number, the less energy it takes to do the same job.

SEER vs. SEER2: What Changed?

On January 1, 2023, the U.S. Department of Energy began using a new testing method. Ratings from this test are called SEER2, EER2, and HSPF2.

•             Why it changed: the new test uses higher airflow resistance, which better reflects how systems perform with real ductwork in real homes.
•             What it means for you: SEER2 numbers are usually a little lower than the old SEER numbers for the same equipment. A system is not less efficient; it is just measured more realistically.
•             Rough conversion: SEER2 is typically about 4% to 5% lower than SEER for the same system. For example, about 15 SEER is roughly 14.3 SEER2.

When comparing quotes, make sure you compare SEER2 to SEER2, not SEER2 to an older SEER number.

AC SEER Rating Chart

Use this air conditioner SEER rating chart to understand where a system falls:

SEER2 Rating	Approx. Old SEER	Efficiency Level	What It Usually Means
Below 13.4	Below 14	Older / low efficiency	Typical of older systems; below today’s minimums for new equipment
13.4 – 14.2	14 – 14.9	Northern minimum	Meets minimum standards in northern states only
14.3 – 15.1	15 – 15.9	Southern minimum / standard efficiency	Meets Texas minimum for most home-sized split AC systems
15.2 – 16.9	16 – 17.9	Mid efficiency	Often two-stage; good value in hot climates
17 – 19.9	18 – 20.9	High efficiency	Often two-stage or variable-speed; better comfort and humidity control
20+	21+	Premium efficiency	Usually variable-speed; highest efficiency and quietest operation

SEER-to-SEER2 comparisons are approximate. Always check the specific system’s official rating.

Minimum SEER Rating for AC in Texas

Since January 1, 2023, federal efficiency minimums for new central air conditioners and heat pumps depend on the region. Texas is part of the Southeast region.

System Type	Northern States	Texas and Southeast
Split-system central AC, under 45,000 BTU/h (under about 3.75 tons)	13.4 SEER2 (14 SEER)	14.3 SEER2 (15 SEER)
Split-system central AC, 45,000 BTU/h and larger	13.4 SEER2 (14 SEER)	13.8 SEER2 (14.5 SEER)
Split-system heat pump (cooling)	14.3 SEER2 (15 SEER)	14.3 SEER2 (15 SEER)
Split-system heat pump (heating)	7.5 HSPF2 (8.8 HSPF)	7.5 HSPF2 (8.8 HSPF)

These are minimums for newly installed equipment. Your existing AC does not have to be replaced because of these rules.

How minimum SEER ratings have changed over time

Period	Typical Federal Minimum (Central AC)
1992 – 2005	10 SEER
2006 – 2014	13 SEER
2015 – 2022	14 SEER in southern states (13 in the north)
2023 – today	15 SEER / 14.3 SEER2 in southern states for most home-sized split systems

If your AC was installed before 2006, it may be rated around 10 SEER, which is far less efficient than today’s systems.

How Much Can a Higher SEER Rating Save?

Cooling energy use goes down as SEER goes up. You can estimate the percentage of cooling electricity saved when upgrading with this formula:

Estimated savings = 1 − (old SEER ÷ new SEER)

Estimated cooling energy savings chart

Upgrade From	To 15 SEER	To 16 SEER	To 18 SEER	To 20 SEER
10 SEER	About 33%	About 38%	About 44%	About 50%
13 SEER	About 13%	About 19%	About 28%	About 35%
14 SEER	About 7%	About 12%	About 22%	About 30%

These estimates compare ratings on the same SEER scale under rated test conditions. Real savings depend on your home, weather, thermostat settings, ductwork, installation quality, and how well the old system was working.

Example

Example only: if your old 13 SEER AC used about 6,000 kWh for cooling in a year, a similar new 16 SEER system might use about 4,875 kWh under similar conditions. At 15 cents per kWh, that is roughly $170 less per year. Check your electric bill for your actual rate.

See how AC affects your bill in is air conditioning part of your electric bill?

Other AC Efficiency Ratings to Know

Rating	What It Measures	Why It Matters
SEER2	Seasonal cooling efficiency	Best overall comparison for cooling efficiency
EER2	Cooling efficiency at a hot outdoor temperature (95°F)	Useful for Texas, where peak heat is common
HSPF2	Heat pump heating efficiency	Important if you are buying a heat pump
AFUE	Gas furnace efficiency	For the heating side of an AC plus furnace system
ENERGY STAR	Meets higher efficiency criteria set by EPA	Quick way to identify more efficient models

For furnace efficiency, see our guide to the most efficient furnaces.

Why Your AC Might Not Reach Its SEER Rating

A SEER2 rating is measured under test conditions. Your system’s real-world efficiency can be lower if:

•             The indoor and outdoor units are not matched. A system’s official rating applies to a specific combination of outdoor unit and indoor coil or air handler. Ask for the AHRI certificate for your exact system combination.
•             The system is the wrong size. Oversized units short cycle and control humidity poorly.
•             Ducts leak. Leaky attic ducts can waste a lot of cooling. Duct sealing helps.
•             Refrigerant charge is incorrect. Too much or too little refrigerant reduces efficiency.
•             Airflow is restricted by dirty filters, closed vents, or undersized ducts.
•             Maintenance is skipped. Dirty coils make any system work harder.

How to Choose the Right SEER Rating for Your Home

Consider your climate

In hot climates like Spring, TX, air conditioners run for many months. That means higher-efficiency systems have more hours to save energy, and payback is usually faster than in cooler states.

Consider how long you will stay

•             Moving in a few years: a system at or slightly above the minimum may make the most sense.
•             Staying long term: a higher SEER2 two-stage or variable-speed system can deliver more lifetime savings and comfort.

Consider comfort, not just savings

Higher SEER2 systems often use two-stage or variable-speed compressors. They run longer at lower speeds, remove more humidity, and run more quietly. Learn more in is variable speed AC worth it?

Compare total cost, not just SEER

Look at upfront price, estimated yearly energy use, warranty, and installation quality together. The highest SEER rating is not always the best value for every home.

Quick guide

Your Situation	SEER2 Range Often Considered
Tight budget or short stay	14.3 – 15 SEER2
Balanced cost and savings	15 – 17 SEER2
Long-term home, humidity and comfort priority	17+ SEER2, two-stage or variable-speed

How to Find Your Current AC’s SEER Rating

1.         Check the yellow EnergyGuide label on the outdoor unit, if it is still there.
2.         Find the model number on the outdoor unit’s data plate.
3.         Look up the model on the manufacturer’s website or the AHRI Directory.
4.         Check your installation paperwork.
5.         Ask a technician during your next maintenance visit.

If your system is older than about 2006, it may be close to 10 SEER.

When to Upgrade to a Higher SEER AC

•             Your AC is 12 to 15+ years old
•             It uses R-22 refrigerant
•             It needs a major repair like a compressor or coil
•             Your energy bills keep rising
•             Your home feels humid or uneven

Read our AC repair vs replace guide and the best HVAC system for Texas for help deciding.

Why SEER Ratings Matter in Spring, TX

•             Long cooling seasons mean efficiency improvements add up over many months.
•             High humidity makes higher-SEER two-stage and variable-speed systems more comfortable.
•             Hot attics can reduce real-world efficiency if ducts are leaky or poorly insulated.
•             Peak summer heat makes EER2 ratings worth checking too.

High-Efficiency AC Installation in Spring, TX

KAC Express helps homeowners in Spring and the surrounding Houston area compare SEER2 options and choose an air conditioner that fits their home, comfort needs, and budget. We size systems properly, match indoor and outdoor equipment, and install them to perform the way they are rated.

Learn more about AC installation, AC replacement, and heat pumps.

•             Licensed Texas HVAC contractor (TACLB33125E)
•             Open 7 days a week, 7am–10pm
•             Call before 2PM for same-day service
•             Upfront, flat-rate pricing before work begins
•             400+ Google reviews from local homeowners
•             Financing available

Real customer feedback: One recent Google reviewer shared that KAC came out quickly on a very hot August day, installed a new, efficient system, and adjusted their ductwork.

Want to compare SEER2 options for your home? Call KAC Express at 832-326-5687 or schedule an estimate.

Frequently Asked Questions

What is a good SEER rating for an air conditioner?

In Texas, new central AC systems must meet at least 14.3 SEER2 for most home sizes. Around 15 to 17 SEER2 is a good balance for many homes, while 18+ SEER2 offers higher efficiency and comfort.

What is the difference between SEER and SEER2?

SEER2 uses a newer test that better reflects real ductwork conditions. SEER2 numbers are usually slightly lower than SEER numbers for the same system.

Is a higher SEER rating worth it in Texas?

Often, yes. Long cooling seasons give high-efficiency systems more time to save energy, especially if you plan to stay in your home for several years.

Do I have to replace my old AC because of new SEER2 rules?

No. The minimums apply to newly installed equipment. You can keep using and repairing your current system.

How do I find my AC’s SEER rating?

Check the EnergyGuide label or model number on the outdoor unit, then look it up on the manufacturer’s website or the AHRI Directory.

What is EER2?

EER2 measures cooling efficiency at a hot outdoor temperature. It is helpful for comparing performance during peak Texas heat.

Does a high SEER AC control humidity better?

Many high-SEER systems use two-stage or variable-speed compressors, which run longer at lower speeds and typically remove more humidity.