Lennox Heat Pump Service Nationwide | Dalton Heating & Air Alpharetta

Lennox Heat Pump Service: The Alpharetta Owner’s Guide

Lennox heat pump service in Alpharetta typically runs $150 – $650 installed, depending on which part failed and whether we’re repairing or replacing it. Most Lennox heat pump repairs are done same-day, and our trucks carry the most common Lennox parts, so we’re not waiting on a warehouse while your house heats up. Most Alpharetta homeowners call us after noticing the system running constantly, making noise it never made before, or short-cycling, which is the unit kicking on and off every few minutes. If you’re hearing a rattle from the outdoor unit or your auxiliary heat light is on when it shouldn’t be, that’s the call to make.

Call (229) 537-2086

Which Lennox Models This Applies To

We service the full Lennox heat pump line: the Merit series (ML14XP1, ML17XP1), the Elite series (XP14, XP16, XP20, XP21, XP25), and the Dave Lennox Signature series (XP21, XP25, SL25XPV). The part you need depends on your exact model and serial number, which are on the data plate attached to the outdoor unit, usually on the back corner. Here’s a compatibility gotcha most Alpharetta homeowners run into: Lennox has used different refrigerant types over the years, and parts are not interchangeable between R-22 systems (pre-2010) and R-410A systems. A reversing valve for an XP14 will not fit an older HPX13, even if they look similar at a glance. For most repairs, we recommend OEM Lennox parts because of exact fitment and factory testing. There are quality aftermarket equivalents for some items like capacitors and contactors, but for compressor-related work, we use OEM without exception. The warranty on OEM parts is typically longer, and we’ve seen cheaper aftermarket reversing valves fail within two Georgia summers.

Signs Your Lennox Heat Pump Service Is Failing

• System won’t switch between heating and cooling. This usually points to a stuck reversing valve, which is the part that redirects refrigerant flow depending on whether you want warm or cool air. In Alpharetta’s shoulder seasons, when you’re switching the thermostat back and forth, this valve works hardest and fails fastest.
• Outdoor unit hums but the fan won’t turn. A failed capacitor is the most common culprit. It’s a small cylinder that gives the fan motor its starting jolt, and Georgia humidity is rough on them. We stock these on every truck because they’re the number one Lennox heat pump failure we see in spring.
• Ice on the outdoor coil in summer, or the coil freezing in winter. This points to low refrigerant or a failing defrost control board. The defrost board is Lennox-specific and needs to match your exact series, otherwise the unit won’t cycle defrost properly and you’ll be chipping ice off the coil in January.
• Short-cycling, or the unit running constantly without reaching set temperature. Could be a failing compressor, a refrigerant leak, or a bad thermostat sensor. If the compressor is cycling on thermal overload, that’s the beginning of a failure that gets expensive if ignored.
• Burning smell or loud grinding from the outdoor unit. A grinding noise from the compressor means bearings or internal damage, and a burning smell from the fan motor means the windings are going. Neither is something you can patch; both need a professional to assess whether repair or replacement makes sense.

Replacement Cost & What’s Included

For Lennox heat pump service in Alpharetta, expect these installed price ranges:

• Capacitor replacement: $150 – $250
• Contactor replacement: $150 – $250
• Defrost control board: $250 – $450
• Reversing valve: $450 – $650
• Fan motor replacement: $350 – $550
• Compressor replacement: $650+ (often makes more sense to replace the whole unit if it’s past 10 years old)

What drives the range is part cost, which varies by series, and labor, which varies by how much of the unit has to come apart. A reversing valve replacement on an XP21 is more involved than a capacitor swap on an ML14XP1. Every job includes the part, the labor, the refrigerant if needed, and a written guarantee on the repair for a full year. If the repair fails in that year, we return at no charge. The price we quote is the price you pay, in writing, before any wrench turns. That’s The Garrison Standard, and we don’t deviate from it.

DIY or Call Us?

If you want to check the obvious before calling: make sure the thermostat is set correctly, check the breakers, and confirm the outdoor unit isn’t buried in leaves or blocked by shrubs. Those cause a surprising number of service calls in Alpharetta, especially after a storm blows debris against the unit. After that, stop. A heat pump contains high-voltage capacitors that hold a charge even with the power off, and refrigerant under pressure that you’re legally required to be licensed to handle. The reversing valve and compressor are not homeowner jobs. One wrong wire on a defrost board and you’re buying the board twice. Call us at (229) 537-2086 and Marco or one of our techs will walk through what the unit is doing before we ever send a truck. Tell me what it’s doing, and I’ll tell you what it needs – no guesswork, no markup on confusion.

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