Just Bought a Home? Check Your AC’s Condition

You can size up an inherited Collin County AC system in about fifteen minutes without calling anyone: read the manufacture date off the outdoor unit’s serial number, run a quick visual check on the condenser and drain line, and pull whatever service records survived the sale. Trusted Heating & Air Conditioning, a TDLR-licensed Air Conditioning/Refrigeration Contractor (#TACLA152199C, active through June 2027) serving Collin County and Plano, walks new owners through this same baseline for free before recommending anything. The goal isn’t a verdict on day one. It’s knowing whether you’re looking at a system with years left or one that’s inching toward AC replacement before your first 100-degree week.

A new house comes with a system nobody explained to you, at the exact moment your cash is tightest after closing. That combination is what makes this the highest-anxiety, lowest-information AC decision most homeowners ever face. The good news: dating and inspecting the unit yourself takes less time than unpacking a single box.

How old is your AC actually

Every outdoor condenser carries a data plate, usually on the side or back panel, listing the brand, model number, and serial number. Some manufacturers print the manufacture date directly on that plate. When they don’t, the serial number encodes it, but the format differs by brand, so don’t trust a generic online chart. The reliable move is to plug the model and serial number into the AHRI Directory (ahridirectory.org), the public database HVAC professionals use to verify certified equipment, or read them to a licensed technician who can pull the manufacture date in under a minute. Either way, you want an actual date, not a guess based on how new the unit looks.

The quick visual check for a new homeowner

Before anyone gets a phone call, walk the system yourself. Five things to look at:

• The outdoor condenser sits level, sits clear of grass clippings and cottonwood fluff, and has straight, undamaged fins.
• The coil, visible through the condenser’s side grille, shows a light dust film rather than a caked, matted layer.
• The condensate drain line and pan carry no standing water, no rust stains, and no obvious clog.
• The air filter, checked at the return vent or air handler, isn’t gray with buildup or bent from being forced into the wrong slot.
• The thermostat holds a program and takes a setpoint change without a delayed or erratic response.

None of this replaces a technician’s readings. It just tells you whether the system was breathing freely before you owned it, the single biggest driver of compressor wear here.

Signs the previous owner kept up the system, and signs they didn’t

A dirty coil or a full filter doesn’t mean the compressor is dying. It means the system worked harder than it needed to during exactly the months that cook electrical parts fastest here: capacitors and contactors take the worst of North Texas run-time, and a system that’s been neglected for a season shows up first in those cheap, replaceable parts, not the compressor.

What should a first-summer tune-up include

A baseline tune-up on an inherited system should follow our maintenance and tune-up checklist: measure refrigerant charge against the manufacturer’s spec, check the temperature split between return and supply air, tighten electrical connections, and clean the outdoor coil if the visual check flagged buildup. A technician should hand you the actual readings, not just a verbal “it’s fine.” Ask for that report in writing.

Cost varies by company, and a basic diagnostic-only visit commonly runs less than a full repair-inclusive tune-up, so ask what’s covered before you book. A tune-up that only lists a price with no description of what’s checked is a red flag on its own.

What to budget if you inherited a 10 to 15 year old system

ENERGY STAR frames 10 to 15 years as when to start paying attention to a system’s condition, not a deadline. As of 2026, real-world lifespan for a maintained North Texas AC commonly runs 15 to 20 years or more (see how long AC units actually last in North Texas for the full picture), so a system in this age band still has real life in it if the fundamentals check out. Budget for a possible capacitor or contactor repair in the first year, the parts most likely to fail first under sustained heat, and hold off on assuming a full replacement until a technician actually measures the system.

Contractors sometimes cite an “age times repair cost” shorthand, or a rule that a repair costing more than half of a new system’s price favors replacing. Both are industry rules of thumb, not law, and 2026 refrigerant pricing (R-410A is getting scarcer, not banned, as production quotas step down) has pushed some repair quotes higher without changing what the equipment can still do. If someone tells you a 12-year-old system “has to go” purely because of its age, with no measurement behind that statement, that’s worth a second opinion, from us or anyone else.

How to protect the warranty on a newer inherited system

If the data plate shows a manufacture date of 2018 or later, the system is likely still inside its factory parts warranty window, but most manufacturers require the new owner to register online within 60 to 90 days of a change in ownership to keep full coverage active. Skipping that step often drops you to a shorter default warranty. Newer construction across Prosper, Celina, and outer Frisco frequently carries builder-installed systems from this era, so this step is worth doing in your first month.

When does an inherited AC quirk need a call

For everything in the “wait” row, our AC repair symptom guide covers the safe checks you can run yourself first. If you’re weighing whether an older inherited system is worth repairing at all, our repair-vs-replace breakdown walks through the math both ways.

Ready to fix it right? get a free replacement assessment or call (945) 333-4822.