Here's a Decision
Should I Repair or Replace My AC?
If your AC just quit and the repair quote made you wince, you are asking the right question. Sometimes a repair is the smart move. Sometimes you are putting good money into a system that is already on its way out. The hard part is knowing which one you are looking at.
Here is how to tell, using the same two rules HVAC professionals use, plus what a new system actually costs in 2026.
Start with the $5,000 rule
This is the quick gut check. Multiply your system's age by the repair cost. If the result is over $5,000, replacement is usually the smarter spend.
Say you have a 12-year-old system and the repair quote is $1,900. That is 12 times 1,900, which comes to $22,800. Well over the $5,000 line, so the math points to replacing it.
The reason it works is that it weighs age and cost together. A $1,900 repair on a 3-year-old unit is fine. The same repair on a 15-year-old unit is money you will likely spend again before long.
Then check the 50% rule
The second rule is even simpler. If the repair costs more than half of what a new system would cost, replace it.
A new central AC and furnace runs about $7,000 to $20,000 installed in 2026, and most homes land somewhere around $9,000 (Angi, This Old House). So if your repair quote is over roughly $4,500, you are paying half the price of new just to keep an old system going. That rarely pays off.
Age matters more than people expect
Air conditioners and heat pumps usually last 10 to 15 years. Furnaces tend to go a bit longer, around 15 to 20. Once you are past those windows, repairs stop paying back, because the next failure is rarely far behind.
There is one more age trap worth knowing. Systems installed before 2011 were likely built with R-22 refrigerant, which has since been phased out. Any repair that touches the refrigerant on those units gets expensive fast, because the refrigerant itself is now scarce and costly. If your system is that old and the repair involves the coolant, lean hard toward replacement.
The signs it is time to replace
Even when the math is close, these tip the decision toward a new system:
- Three or more breakdowns in the last two years. That is a decline cycle, and each repair tends to buy less time than the last.
- Energy bills climbing with no clear reason. An old SEER 8 or 9 unit costs 20 to 40 percent more to run than a modern SEER2 system. You are paying for the old system every month, repair or not.
- Uneven rooms, humidity problems, or a system that short cycles. Comfort issues on an aging unit usually mean larger failures are on the way.
When repairing is the right call
Replacement is not always the answer. Fix it if:
- The system is under 10 years old and has been reliable.
- The repair is small compared to what the system is worth.
- You are moving within a year or two. A targeted fix beats buying new for such a short window, and the sale price can reflect the system's age.
Get your own answer
Every system is different, and the rules above are general. Your repair quote, your system's age, your energy bills, and how long you plan to stay all change the math.
We built a free tool that runs your exact numbers through both rules and gives you a straight answer in about two minutes. No typing, you just pick your situation.
This guide is for general information and is not a substitute for advice from a licensed HVAC technician. Costs vary by region, system type, and home.