When an air conditioner fails in the middle of August, the decision usually gets made under pressure, in a hot house, with one number on the table. That is how people end up replacing systems that had years left, and how other people spend $1,800 on a unit that fails again the following summer.
The decision is not complicated once you separate it into four questions.
1. How old is the system, really
Find the data plate on the outdoor unit and read the serial number. Most manufacturers encode the manufacture date in the first four digits, and any technician can tell you in a few seconds.
In Colorado, a well maintained air conditioner commonly runs fifteen to twenty years. Our dry air is easier on equipment than a humid climate. Hail is the local factor that shortens condenser life, and a unit that took a bad storm five years ago may be running with reduced heat rejection.
Practical thresholds most technicians use:
- Under 8 years: repair, in nearly every case. The equipment has most of its life left and may still have parts warranty coverage.
- 8 to 12 years: depends on the repair. Small electrical repairs are easy calls. A compressor or evaporator coil is worth a real conversation.
- Over 12 years: a major repair is a genuine decision point, and the refrigerant question below usually decides it.
2. What does the repair cost against the value of the system
A common rule of thumb multiplies the repair cost by the age of the system and compares that to the replacement cost. It is rough, but it is directionally useful and it keeps the conversation honest.
More practically, repairs tend to fall into three tiers:
- Minor: capacitors, contactors, condensate drains, thermostats, float switches. Repair regardless of age.
- Moderate: fan motors, control boards, TXVs, accessible leak repairs. Usually repair, with age as a tiebreaker.
- Major: compressors, evaporator coils, condenser coils, multiple simultaneous failures. This is where replacement enters the conversation.
One caution. A compressor replaced under a parts warranty still carries significant labor, refrigerant and recovery cost, so “the part is free” is rarely the whole picture. Ask for the out-the-door number.
3. What refrigerant does it use
This question decides more replacement conversations than anything else right now.
R-22 systems. R-22 has not been produced or imported in the United States since 2020. Only reclaimed and previously stockpiled supply remains, and it is expensive. A capacitor on an R-22 system is fine to replace. A major leak requiring several pounds of refrigerant, on equipment that old, generally does not justify the spend.
R-410A systems. R-410A is now in its own phase-down under the AIM Act, and new residential equipment has been transitioning to lower global warming potential refrigerants such as R-454B. R-410A is still available and will be serviceable for years, so this is not a reason to replace a working system. It does mean the long term cost of large recharges will drift upward.
4. What else changes if you are replacing anyway
This is the question that gets skipped, and in Colorado in 2026 it is the one with the most money attached.
If you are replacing the air conditioner, a cold climate heat pump is the same installation with the same ductwork and roughly the same footprint. It costs modestly more than a comparable new condenser, and the current incentive stack in the north metro is large enough that the heat pump can land below the price of the air conditioner by itself.
Xcel Energy pays $2,250 per heating ton for qualifying cold climate equipment, Power Ahead Colorado adds $1,500, and the Colorado heat pump tax credit adds $1,000. On a typical 3-ton system that is roughly $9,250. Our 2026 Colorado heat pump rebate guide covers what each program pays and who qualifies.
The practical result is that a homeowner replacing a dead air conditioner often gets better cooling, plus heating capability, for less than the straightforward like-for-like swap. That is unusual, it is a function of the incentives available right now, and it is worth asking about before you sign for a condenser.
Things that should be checked before any replacement quote
A new system installed on the same problems as the old one performs like the old one.
- Load calculation. Sizing should come from a Manual J calculation on your house rather than from the tonnage of what is being removed. Plenty of existing systems were oversized when installed, and oversized air conditioners short cycle and dehumidify poorly.
- Duct and static pressure. Undersized returns are extremely common in homes of a certain era. A higher efficiency system on restricted duct will not deliver its rating.
- Electrical capacity. Worth confirming before the install date, particularly if you are considering a heat pump.
- Line set condition. Changing refrigerants can require line set replacement or thorough flushing.
Common questions
Can I replace just the outdoor unit?
Usually not a good idea. The outdoor unit and the indoor coil are engineered as a matched pair, and mismatching them costs capacity and efficiency. It also usually voids the AHRI certification, which matters if you are claiming a rebate. On older systems a matched replacement part may not even exist.
How long does a replacement take?
A straightforward changeout is typically one day. Add time for electrical work, duct modifications or a heat pump conversion.
Does a new air conditioner really lower my electric bill?
Yes, though the size of the change depends on what is being replaced. Moving from a 10 SEER unit from 2004 to a modern variable capacity system is a substantial reduction in cooling cost. Moving from a 15 SEER unit installed in 2018 is not.
Should I replace now or wait until it dies?
Planned replacements are cheaper and calmer than emergency ones. You get scheduling flexibility, time to compare quotes, and time to file for rebates that require pre-approval. If your system is over twelve years old and has needed two repairs in two seasons, planning is reasonable. If it is running well, keep it and maintain it.
Get both numbers before you decide
We quote the repair and the replacement, and we explain which one we would choose in your position and why. Sometimes that answer is repair it and get another four years. We would rather tell you that than sell you a system you did not need.
GoodFellas serves Northglenn, Thornton, Westminster, Broomfield, Arvada, Longmont, Boulder, Brighton, Erie, Lafayette, Louisville, Superior, Wheat Ridge and Commerce City.
Call (303) 457-4328 or request an estimate.
