🧰 Introduction: The Big Question — Repair or Replace?
Hey, Tony Marino here. If you’ve got a through-the-wall air conditioner that’s been acting up, you’re probably wrestling with a tough question: Should I fix it or just buy a new one?
It’s a common dilemma. Repairing an old unit can be cheaper in the short term, but sometimes it’s just throwing money at a machine that’s on its last legs. On the flip side, replacing a unit too early can be a waste of good years and money.
In this guide, I’ll help you understand:
-
How long through-the-wall AC units typically last
-
The major signs that suggest repair or replacement
-
What repair and replacement usually cost
-
How energy efficiency impacts your decision
-
Tips to make the best choice for your home
Let’s dig in.
⏳ How Long Should a Through-The-Wall AC Last?
Knowing the typical lifespan gives you a benchmark to measure your unit’s condition.
Most through-the-wall air conditioners last about 10 to 15 years, assuming regular maintenance and moderate use. Some last longer, but as they age, repairs get more frequent and efficiency drops.
According to the U.S. Department of Energy, proper maintenance can extend lifespan, but eventually, even well-cared-for units become costly to run and repair. Energy.gov’s guide on air conditioner maintenance explains how aging affects performance.
🚩 Key Signs It’s Time to Repair Your AC
If your unit is under 10 years old, repairs often make sense — especially for minor problems. Here are common signs to watch for that usually point to fixable issues:
1. The Unit Won’t Cool Properly
This is often caused by dirty filters, clogged coils, or refrigerant leaks. Sometimes a simple cleaning or recharge solves the problem.
2. Strange Noises or Vibrations
Rattling or buzzing could mean loose parts or debris caught in the fan. These are typically inexpensive to fix.
3. Water Leaks Inside the Room
Clogged drainage or improper tilt often causes leaks. Cleaning the drain or resealing the sleeve usually fixes this.
4. Unit Won’t Turn On or Cycles On and Off Frequently
This might be due to thermostat problems or electrical issues that a technician can troubleshoot and repair.
5. Higher-Than-Normal Energy Bills
If you notice your electric bill rising but usage is steady, your AC might be working harder due to dirty filters or failing components.
If you want to learn more about diagnosing and fixing these common issues, check out this helpful EPA article on HVAC maintenance and repairs.
🚩 Key Signs It’s Time to Replace Your AC
When your unit hits or passes the 10- to 15-year mark, or if repairs become frequent and costly, replacement becomes worth considering. Here’s when replacement is typically the better call:
1. Major Component Failures
If the compressor, motor, or condenser coil fails, repairs can be expensive — sometimes over half the cost of a new unit.
2. Refrigerant Is Obsolete or Hard to Find
Older units use refrigerants like R-22, which are being phased out due to environmental regulations. Finding replacement refrigerant can be costly or impossible.
Modern through-the-wall AC units use eco-friendly refrigerants like R-32, which you can read about at the EPA’s refrigerant transition page.
3. Persistent Performance Problems
If the unit frequently fails to maintain temperature or cycles excessively despite repairs, it’s a sign of declining efficiency.
4. High Repair Costs Add Up
If repairs total more than half the cost of a new unit within a short time, replacement is usually more economical.
5. Energy Bills Are Skyrocketing
Old or failing units lose efficiency, leading to increased electricity usage. New units often have much better SEER ratings and use advanced refrigerants that lower energy consumption.
You can explore how energy efficiency impacts your costs in this article from ENERGY STAR on choosing efficient air conditioners.
💸 Repair vs. Replace: What Does It Cost?
Costs vary widely depending on brand, model, and region, but here’s a rough breakdown:
Typical Repair Costs
-
Minor repairs (filter replacement, cleaning): $50–$150
-
Refrigerant recharge: $150–$350
-
Compressor replacement: $600–$1,200
-
Electrical repairs: $150–$500
Typical Replacement Costs
-
Through-the-wall AC units range from $500 to $1,500+ depending on capacity and features.
-
Installation typically runs $300 to $700 depending on complexity.
If you’re staring down a $1,000+ repair on a 12-year-old unit that costs $1,200 installed to replace, replacement is usually the smarter choice.
For more detailed cost info and decision-making tips, the HomeAdvisor AC repair and replacement cost guide is an excellent resource.
⚙️ Energy Efficiency and Long-Term Savings Matter
While the upfront cost of a new unit can feel steep, don’t forget the long-term savings on your utility bills.
New through-the-wall AC units typically feature:
-
Higher SEER/EER ratings for better energy use
-
Eco-friendly refrigerants like R-32 that transfer heat more efficiently
-
Advanced compressor and fan designs to reduce noise and waste
Upgrading your unit can pay for itself over a few years in energy savings alone. The Department of Energy has a great calculator and guide on how much you can save with newer AC units.
🛠️ How to Extend Your Current AC’s Life
If you decide to repair and keep your current unit, these maintenance tips can help you avoid premature failure:
-
Clean or replace filters every 1–3 months during use
-
Keep the exterior coil free of debris and dirt
-
Seal gaps around the wall sleeve to reduce hot air infiltration
-
Schedule professional maintenance annually to catch small issues early
🧠 When to Call a Pro
Even if you want to DIY some maintenance, always call a licensed HVAC technician for:
-
Refrigerant handling or leaks
-
Electrical repairs
-
Compressor or motor replacements
-
Complex diagnostic work
Certified pros will also ensure your unit complies with safety and environmental regulations — especially regarding refrigerant handling. The EPA’s Section 608 Certification outlines technician requirements.
🏠 Final Thoughts: Make the Best Choice for Your Home and Budget
Choosing between repairing or replacing your through-the-wall AC isn’t always black and white, but by watching for these key signs and weighing costs, you can make an informed decision.
-
If your unit is under 10 years old and problems are minor, repairing is often best.
-
If you’re facing major repairs on a 10+ year-old unit, consider replacement.
-
Factor in energy savings from a new unit to understand long-term benefits.
-
Always balance upfront cost with comfort, efficiency, and peace of mind.
And remember: when you’re ready for a new unit or want expert advice, browse the latest through-the-wall air conditioners available at The Furnace Outlet. Our team is here to help you find the perfect fit.
✍️ About the Author
Tony Marino is a veteran HVAC technician with over 20 years of experience helping homeowners keep their heating and cooling systems running smoothly. Tony’s goal is to make HVAC knowledge accessible, so you can make confident, cost-effective decisions.
