The short version
Repair young systems with small problems. Replace old systems with big ones. The middle cases need numbers, and the best time to get them is before the system fails.
Bluffline Memphis Heat Pumps installs replacement heat pumps and puts the replacement price in writing, so you can set it beside any repair quote you have.
A quick guide
| Situation | Usual answer |
|---|---|
| Under 10 years, small part failed (capacitor, contactor, fan motor) | Repair |
| Under 10 years, compressor failed, under warranty | Repair |
| 10 to 15 years, small part failed | Repair |
| 10 to 15 years, compressor or coil failed | Compare both prices |
| Past 15 years, compressor or coil failed | Replace |
| Any R-22 system needing a coil, compressor or recharge | Replace |
| Repeated repairs in the last two seasons | Lean toward replacing |
Age
A Memphis heat pump works most of the year: cooling from May into October and heating through the winter. Fifteen to twenty years is a fair working life with good maintenance. The lifespan guide covers what shortens it.
Why age changes the math
When one major part fails on an old system, the others are just as old. A new compressor in a 17-year-old outdoor unit still leaves you with a 17-year-old coil, fan, valves and controls, and often a 17-year-old indoor half too.
Refrigerant
Systems built before about 2010 often run on R-22, which is no longer produced. Only recovered and reclaimed R-22 is sold, and the price is high.
What that means
- A leak on an R-22 system will keep needing expensive refrigerant.
- A coil replacement on an R-22 system can’t use a new-refrigerant coil.
- A new outdoor unit can’t be paired with an R-22 indoor coil.
So major work on an R-22 system is rarely worth it. Check the label on the outdoor unit for the refrigerant type.
The size of the repair
Small parts fail on every heat pump: capacitors, contactors, fan motors, thermostats, defrost boards. Those repairs are routine and usually worth doing at any age.
The big three
- Compressor, the most expensive part, often a large fraction of a new outdoor unit’s price.
- Outdoor or indoor coil, especially when it leaks.
- Reversing valve, which takes the system apart to replace.
A big-three failure on a system past about 15 years is the clearest case for replacing. A big-three failure on a young system under the maker’s parts warranty is a different story: the part may be covered, leaving labor and refrigerant.
A simple rule of thumb
Some contractors use a 5,000 rule: multiply the unit’s age by the repair cost. If the result is above about $5,000, lean toward replacing. A 14-year-old unit with a $1,200 repair scores 16,800, well over.
An 8-year-old unit with a $300 repair scores 2,400, well under.
Its limits
The rule ignores refrigerant type, efficiency and comfort problems. Treat it as a first look, not the decision. A young system with an expensive repair can still be worth fixing, and an old one with a cheap repair can still be near the end.
What the old system never did well
A repair puts the system back the way it was. If the way it was wasn’t good, that counts.
Problems a replacement can fix
- A clammy house at a normal setpoint, often from oversizing.
- Uneven rooms or a hot upstairs.
- Strip heat running too much in winter.
- A loud unit under a bedroom window.
A replacement sized from a load calculation, with the ducts checked, can address those. The sizing guide and the humidity guide explain how.
Efficiency and the bill
A heat pump from the early 2000s may rate around 10 to 13 SEER on the old scale. A new unit at 15 to 17 SEER2 uses noticeably less electricity for the same cooling.
On a Memphis summer bill that adds up, though the payback alone rarely justifies replacing a working system. SEER2 and HSPF2 explained has the numbers.
Planning ahead
Replacing in a July heat wave means deciding fast, when supply is tight and every day without cooling hurts.
If your heat pump is past 15 years, getting a written replacement estimate before it fails gives you time to compare, check the rebate tier and pick the season.
What to have ready
- Photos of both nameplates, outdoor and indoor.
- Any repair quote you have.
- Twelve months of power bills.
- A list of comfort problems you’d like fixed.
Outdoor unit only or the whole system
If the indoor half is recent, uses the right refrigerant and is a listed match for a new outdoor unit, replacing only the outside may be enough. Bluffline’s typical range for that is $4,500 to $9,000, and for a whole-home system $8,000 to $16,000.
Your written estimate after the visit sets the price. Heat pump replacement explains the choice.
Two worked cases
Numbers make the choice clearer. Two typical Memphis cases, using Bluffline’s typical ranges for the replacement side:
| Case A | Case B | |
|---|---|---|
| System | 9-year-old heat pump on R-410A | 17-year-old heat pump on R-22 |
| Failure | Outdoor fan motor | Leaking outdoor coil |
| Repair | A few hundred dollars | Coil plus reclaimed R-22, well over a thousand |
| Replacement | Outdoor unit only, $4,500 to $9,000 | Whole system, $8,000 to $16,000 |
| Usual answer | Repair | Replace |
Case A
A fan motor is a routine part on a young system. After the repair, the heat pump has years left, and replacing it would throw away most of its life.
Case B
The coil can’t be replaced with a modern one because the system is R-22, the refrigerant to refill it is scarce, and the compressor, valves and indoor half are 17 years old too. Any repair money is likely spent again soon.
The middle cases
Most hard decisions sit between those two: a 12-year-old R-410A system with a failed compressor out of warranty, or a 14-year-old system needing a reversing valve. In those cases three questions settle it:
- How long do you plan to stay? A short stay favors the repair; a long one favors replacing.
- What else isn’t working? Comfort, humidity or noise problems tip toward replacing.
- What does the replacement estimate say? A sized estimate with the rebate tier is the only real comparison.
The TVA rebate guide explains how the rebate tier changes a replacement’s net price, and the outdoor unit placement guide covers whether a replacement is a good moment to move the unit.
Warranty
Check the outdoor unit’s registration and warranty before deciding. A compressor still under the maker’s parts warranty changes the math, since the part may be covered and only the labor and refrigerant are owed.
Where to find it
The serial number gives the manufacture date, and the maker’s website can look up registered warranty coverage. Keep the original installation paperwork; some warranties require proof of registration.
The decision in order
Five steps, in this order:
- Find the age and refrigerant on the nameplate.
- Get the repair diagnosed and priced.
- Check warranty coverage.
- Get a written replacement estimate with a load calculation.
- Weigh the two with any comfort problems in mind.
The cost page lists every typical range, and the Memphis buying guide covers the rest of the decision.