Trane and Lennox both offer multiple tiers, variable-speed options, connected controls and limited warranties. But a brand name alone can't tell you whether a system is sized right, whether the indoor and outdoor units are a certified match or whether your ducts will support it. Here's how to compare them fairly — and where we stand.
Our take
On Call installs primarily Trane, and our NATE-certified technicians service all major brands. Either Trane or Lennox can be a sound choice when the equipment is correctly selected and installed. The most useful comparison is one complete, written proposal against another — not brand against brand.
What matters more than the badge
A load calculation, not just matching the old unit's size
Exact model numbers for every component and the AHRI certificate for that match
Duct and airflow findings
Installation and startup procedures
Written warranty terms and who registers the equipment
A clear plan for controls, drainage, electrical and refrigerant lines
Compare systems, not headline numbers
Efficiency ratings describe a specific indoor-outdoor combination, not a whole brand. Ask each bidder for the AHRI certificate and compare like with like — similar capacity and staging, same type of system, same included work. Don't compare a premium variable-speed system on one bid to a basic single-stage system on the other. Our SEER2 guide explains the ratings.
Comfort, noise and controls
Two-stage and variable-speed systems run longer at lower output, which can mean steadier temperatures and better humidity control in a Columbia summer — when the system and airflow are set up correctly. Neither brand has an automatic edge.
For noise, compare the exact models' published data and think about where the outdoor unit will sit. Premium communicating systems from both brands may need their own thermostat to unlock every feature, so ask what you'd give up with a different thermostat.
Installation and ductwork
Sizing: based on your home's insulation, windows, orientation and air leakage.
Airflow: enough return and supply capacity for the new system.
Refrigerant lines: sized, leak-checked, evacuated and charged to the manufacturer's instructions.
Drainage and safety: condensate drain, overflow protection, electrical and code requirements.
Startup: measurements recorded, and a walkthrough of how to use the system.
If you already have comfort problems, connecting new equipment to the same ducts may not fix them. Ask whether duct repairs are recommended.
Refrigerant in 2026
New systems use lower-impact refrigerants, and product lines differ — so confirm the refrigerant for each quoted model. Your existing R-410A system can still be serviced; there's no requirement to replace it. See our R-410A guide.
Warranties
Trane commonly offers a 10-year registered limited parts warranty for eligible residential equipment registered within 60 days. Lennox coverage varies by product and may extend on eligible products after registration. Neither covers every repair, labor charge or refrigerant cost. Get the warranty documents for each quoted model and confirm the registration deadline, labor coverage, transferability and exclusions.
Price and rebates
Compare itemized quotes so a lower price isn't just a smaller scope. The federal 25C tax credit ended for installations after December 31, 2025. Dominion Energy South Carolina residential electric customers may qualify for utility rebates on ENERGY STAR systems.
Bottom line
Choose the proposal that best fits your home, comfort goals, budget and service expectations. The exact equipment and the installation determine the result. Not sure you need a new system? Read AC repair vs. replacement.
Want a Trane quote or a second opinion? On Call has served Columbia and the Midlands since 2011. You'll get matched model numbers and one firm installed price in writing, and your technician can walk you through financing in person. Learn about AC installation and heating installation, or call (803) 781-4357.
