Furnace & heating
AC repair
Heat pumps
Ductless mini splits
Trane
GoodmanSeasonal tune-up and full diagnostic on your Carrier, Trane, or Goodman system - readings shown to you before any repair is proposed
Diagnosis first, numbers second - you approve the repair price before a single part goes in.
Get your free estimateLennox Heat Pump Service: The San Antonio Owner’s Guide
Lennox heat pump repair in San Antonio typically runs $150 – $650 installed, depending on whether you’re looking at a failed capacitor, a refrigerant leak, a dead compressor contactor, or a faulty reversing valve. We stock Lennox-compatible parts on our trucks and can usually get your system diagnosed and fixed same-day, especially if you call before noon. Most San Antonio homeowners discover the problem the hard way: the outdoor unit runs but the air from the vents is warm, the system trips the breaker overnight, or the heat pump makes a grinding noise when it should be quietly pulling humidity out of a 98-degree afternoon.
Which Lennox Models This Applies To
We service the full Lennox heat pump lineup in San Antonio, from older Merit series units (ML14XP1, ML16XP1) to Elite (XP14, XP16, XP20, XP21) and the higher-end Signature series (XP25, XP25-024). The parts compatibility gotcha with Lennox is that many compressors, fan motors, and control boards are series-specific and sometimes even matched to the last digit of the model number. Before we load the truck, we confirm the full model and serial number off the data plate on the side of the outdoor unit, because a Lennox XP16 fan motor will not necessarily drop into an XP20 chassis even though they look nearly identical. The serial number also tells us the exact build date and the original factory parts configuration. On OEM versus aftermarket: for electronics and compressor-mounted components we strongly prefer OEM or Lennox-approved direct-replacement parts, because the control board protocols and sensor voltages on newer Lennox heat pumps are finicky. For single-speed capacitor replacements and standard defrost sensors, quality aftermarket equivalents with matching microfarad ratings work fine and save you money. We carry both on the trucks, matched to your exact unit before we install anything.
Styles & brands we work with
Signs Your Lennox Heat Pump Is Failing
- Warm air from the vents in cooling mode. In San Antonio this usually points to a refrigerant leak or a reversing valve stuck in heat mode. Both are diagnosable with a gauge set and a temperature split test at the air handler.
- Outdoor unit won’t start, or hums and clicks. The most common cause is a failed capacitor, the cylinder-shaped part that gives the compressor and fan motor their starting jolt. On 100-degree days in San Antonio, capacitors fail at roughly double the rate they do in milder climates because the internal insulation degrades faster in sustained heat.
- Condenser fan spins but the compressor doesn’t. This split is classic for a failed compressor contactor, a relay that carries high voltage to the compressor. The fan side can keep working while the compressor side burns out from pitted contacts.
- Unit covered in ice in summer, or icing up in winter outside normal defrost. A frozen coil often signals low refrigerant, a failed defrost board, or a restricted outdoor coil. We see this frequently in San Antonio neighborhoods with heavy oak pollen that packs into the coil fins and blocks airflow.
- Heat pump runs constantly or short-cycles. Under normal San Antonio summer conditions, a properly sized Lennox heat pump cycles on roughly 10 to 15 minute intervals. Constant running or rapid on-off cycling points to a bad thermistor, a failing run capacitor, or a refrigerant charge that is off spec.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
Our Lennox heat pump repairs in San Antonio fall into clear price bands so you know what to expect before we arrive. A standard capacitor or contactor replacement runs $150 – $350 installed. Fan motors, defrost boards, and pressure switches land between $300 and $500. Refrigerant leak detection plus recharge, reversing valve work, and compressor replacements sit in the $500 – $650 range depending on part cost and refrigerant volume. Every job starts with a written price delivered before any work begins, so you approve the number while the unit is still sitting there broken. That price includes the part, labor, system testing after the swap, and our written guarantee. If the same repair fails within the guarantee window, the second visit is free. No renegotiation, no “diagnostic fee on top of the repair fee” games. You get one number and a working system.
DIY or Call Us?
You can safely check two things before you call: confirm your thermostat is set correctly and verify the breakers for both the air handler and outdoor unit are not tripped. A clogged condensate pan or a dirty return filter is also fine to inspect and fix yourself. After that, the DIY track on a Lennox heat pump gets dangerous fast. The capacitor holds enough voltage to stop your heart even with the power off, and the compressor terminals carry 240 volts. Refrigerant handling requires an EPA license, and the reversing valve and defrost board live inside high-voltage circuits. That check you decided to save with a multimeter from Home Depot is not worth a trip to the ER. If you are near the Pearl District or anywhere else in San Antonio and your outdoor unit is humming, clicking, or blowing warm, call us at (903) 623-6784 and we’ll give you a straight answer on the phone before we even schedule the visit.
FAQs
A properly maintained Lennox heat pump in San Antonio typically lasts 12 to 15 years, though units that run hard through consecutive 100-degree summers and short winters often fall toward the lower end. The brutal heat and humidity here put more annual run hours on the compressor than the national average, which is why we recommend a yearly tune-up to catch capacitor degradation and coil fouling early. Call (903) 623-6784 if your unit is past the decade mark and we’ll tell you honestly whether it is worth repairing or time to plan for replacement.
Some parts, like a pitted compressor contactor or a dirty flame sensor, can occasionally be cleaned and restored, but for most Lennox heat pump failures the replacement part is the honest fix. A capacitor or fan motor with degraded internals is not going to recover, and any San Antonio homeowner who has nursed a weak capacitor through a July heat wave can tell you the “temporary fix” costs more in the long run. We’ll always tell you if a repair route is viable before quoting the part, and the written price includes the same guarantee either way.
Most single-part replacements on a Lennox heat pump take 60 to 90 minutes from the time we arrive in San Antonio, including system testing and a full check of the electrical connections after the swap. Refrigerant work and compressor replacements run longer because the system must be evacuated, recharged, and verified with a subcooling check. You’ll get a live arrival time when you book, so you’re not waiting through a four-hour window.
Yes, we stock the most commonly failing Lennox heat pump parts on our trucks, including capacitors, contactors, fan motors, defrost boards, pressure switches, and common thermistors. For less common parts we can typically source them from local San Antonio supply houses within 24 hours. If you want to know whether the part your unit needs is on the truck right now, call us at (903) 623-6784 and ask directly. Straight answer, written price, no runaround.
If your Lennox heat pump is blowing warm air, short-cycling, or making a noise it shouldn’t, call Halden Heating and Air San Antonio at (903) 623-6784. Andre Fuller and the team will give you a clear diagnosis, a written price, and a live arrival time you can track. We also stock parts for Carrier and Trane systems if you have other equipment on the property. We are an independent service provider and are not affiliated with Lennox, which means we answer to you, not a manufacturer’s warranty schedule. Book online or call now and we’ll get it handled.
Written by Andre Fuller, Owner, Halden Heating and Air San Antonio at Halden Heating and Air San Antonio, serving San Antonio and nearby areas.