Your AC is struggling. It's 95 degrees outside, the humidity is brutal, and your house won't cool down. You've got a decision to make — and you're trying to figure out whether a repair makes sense or if you're about to throw money at a dying system.
This is one of the most common calls we get at Lolich. And here's the honest answer: it depends on a few key factors. We're going to walk you through the exact same questions we ask when we're standing in front of a struggling AC system in a St. Louis home.
Start Here: How Old Is Your System?
Age is the single most important factor. Central air conditioning systems have a typical lifespan of 15–20 years. In St. Louis, where summers push equipment hard from June through September, systems on the older end of that range often start showing their age earlier.
Under 10 Years Old
Repair almost always makes sense unless the compressor has failed. These systems still have significant life left. A failed capacitor, refrigerant leak, or bad contactor is a straightforward fix.
10–15 Years Old
This is the gray zone. Minor repairs still make sense. But if you're facing a major repair (compressor, coil replacement), run the cost comparison below before deciding.
15+ Years Old
At this age, even a successful repair just buys you time before the next failure. If you're facing a significant repair cost, replacement is almost always the smarter financial move — especially when you factor in the efficiency gains from a modern system.
The 50% Rule
Here's a simple rule that holds up well: if the repair cost is more than 50% of the cost of a new system, replace it.
In St. Louis, a full central AC replacement runs roughly $6,000–$12,000 depending on the size of your home and the system you choose. So if a repair quote comes back at $3,500 or more on a system that's already aging — that's your signal to replace.
The logic is simple: you'd be putting significant money into a system that could have another major failure within a year or two anyway. That's money you could have put toward a new system with a 10-year warranty.
Repairs Worth Making vs. Repairs That Signal Replacement
Not all repairs are equal. Here's how we categorize them:
- • Capacitor or contactor replacement — $150–$350, quick fix
- • Thermostat replacement — $150–$300
- • Condensate drain clog clearing — $100–$200
- • Minor refrigerant recharge after small leak repair — $200–$500
- • Fan motor replacement — $300–$600
- • Evaporator coil replacement — $1,000–$2,000
- • Condenser coil replacement — $1,500–$3,000
- • Major refrigerant leak (requires line set work) — $500–$1,500
- • Compressor failure — $1,500–$3,000+ for repair, often not worth it on older units
- • Multiple component failures in one season
- • R-22 refrigerant system (phased out — recharging is expensive and a dead end)
The St. Louis Factor
St. Louis summers are genuinely demanding on HVAC equipment. We regularly see 90°F+ days with high humidity for 3–4 straight months. That puts more wear on compressors and capacitors than you'd see in a milder climate. Systems here tend to experience component failures earlier than their rated lifespan.
The flip side: St. Louis winters require a real heating system too. If you're replacing your AC, it often makes sense to evaluate the furnace at the same time. Replacing both as a matched system maximizes efficiency and qualifies for better warranty coverage.
What a New System Gets You
Modern AC systems are significantly more efficient than systems from 10–15 years ago. A new system typically:
- Runs at a higher SEER rating (efficiency) — lower monthly utility bills
- Qualifies for a 10-year manufacturer parts warranty
- Cools more consistently with variable-speed technology
- Uses R-410A refrigerant (R-22 systems are being phased out entirely)
- Pairs with a smart thermostat for better control
Our Honest Recommendation Process
When we come out to diagnose your AC, here's what we actually do:
- 1Full system diagnostic — $125We test electrical components, check refrigerant charge, inspect the coils and compressor, and review the age and condition of the system overall.
- 2Written repair costWe give you the exact repair price before touching anything.
- 3Honest comparisonIf we think replacement makes more sense given the age, repair cost, and condition — we'll tell you. If repair is the right call, we'll say that too. We don't push replacements to generate a bigger ticket.
- 4You decideNo pressure, no follow-up calls. You have the information — the decision is yours.
AC acting up in St. Louis?
We'll come out, diagnose the problem, and give you the honest assessment — repair or replace, whatever actually makes sense for your situation. $125 service call. 24/7 emergency service available.