When to replace your AC unit

Why Texas numbers are shorter

A Frisco system runs from roughly April to October, often for many hours a day through July and August. The same equipment in Ohio runs a fraction of those hours. Life expectancy in this trade is really a run-hours figure wearing a years costume, and ours accumulate fast.

The five real triggers

1. R-22. If your system is pre-2010 there is a good chance it uses R-22, which has not been produced or imported in the US since 2020. Remaining stock is reclaimed and expensive. This is often the trigger that decides it.
2. Compressor or evaporator coil failure out of warranty. Either is frequently 50–70% of a new system.
3. The third repair in two years. Not one failure — a pattern.
4. Bills climbing without a rate change. Efficiency degrades gradually enough that you do not notice until you compare year against year.
5. Humidity you cannot shift. A system that cools but leaves the house clammy is often oversized, losing charge, or both.

Age brackets, roughly

• Under 10 years: repair, almost always.
• 10–15: the ambiguous zone. Use the $5,000 rule and check the refrigerant.
• 15–20: replacement is usually the better value even when repair is possible.
• Over 20: you are on borrowed time. Plan rather than wait.

Why timing matters more than most people realise

Most systems get replaced in July, because that is when they fail — and July is the worst possible time to buy one. Schedules are full, lead times stretch, and you are making a $12,000 decision in a house at 88°F with a contractor who knows you cannot wait.

Replacing in February through April means better availability, time to compare three quotes properly, and a full summer of the efficiency you just paid for. If your system is fifteen-plus and still running, that is the window to aim at.

How to find out how old your system actually is

Most homeowners are guessing, and the guess is usually low. The answer is on the nameplate sticker on the outdoor condenser, and it does not require a technician.

Manufacturers encode the date in the serial number, and the schemes differ by brand. The two common patterns: a four-digit week-and-year at the start or end of the serial, and a letter-plus-digits scheme where the letter is the month. Failing that, the model and serial typed into a search will usually resolve it, and many brands publish a decoder.

Two cautions. The nameplate gives the manufacture date, which can precede installation by a year or more on equipment that sat in a warehouse. And on a system replaced piecemeal, the condenser and the indoor coil may have quite different dates — check both.

Budgeting for it before it fails

A system in the 15-plus bracket is a known upcoming expense, and treating it as one costs less than treating it as an emergency. Three things worth doing while it still runs:

1. Get a quote you are not obliged to accept. Ours are free and there is no presentation attached. Knowing whether the number is $9,000 or $18,000 changes how you plan.
2. Check the warranty status. If the original installer registered the equipment, you may have parts coverage you did not know about — which can make one more repair the obvious call.
3. Decide your threshold in advance. Write down the repair figure at which you will stop paying. Deciding that in January is a very different exercise from deciding it in July with the house at 88°F and a technician waiting for an answer.

How to plan rather than react

• Note the system’s age from the nameplate serial.
• Check the refrigerant type.
• Get a written repair-versus-replace opinion from someone who does repair work — not from an installer.
• If you are in the 15-plus bracket, get quotes in winter with no obligation. When it does fail, you are making a phone call rather than a decision.

Sometimes the right answer is a $400 repair in July to reach a February replacement. That is often the cheapest total outcome, and it is not one you will be offered by someone selling you a system in August.

AC installation and replacement →