LII vs TT: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of August 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

Reading it: LII is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. LII and TT share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined LII and TT exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

Lennox International designs, manufactures, and distributes heating, ventilation, air conditioning, and refrigeration (HVACR) equipment across North America under the flagship Lennox brand and related labels. The business runs in two segments: Home Comfort Solutions (residential furnaces, air conditioners, heat pumps, and related equipment sold largely through dealers and distributors) and Building Climate Solutions (commercial rooftop units, controls, and refrigeration for light-commercial customers such as retailers, restaurants, and convenience stores). A large share of demand is replacement rather than new construction, which gives the model a more stable, recurring feel than pure cyclicals, and the company has leaned on manufacturing efficiency, direct-to-dealer distribution, and pricing to expand margins over time.

Full LII guide

Trane Technologies is an Ireland-domiciled, US-listed maker of heating, ventilation, air conditioning (HVAC) and refrigeration systems, operating mainly through the Trane (commercial and residential HVAC) and Thermo King (transport refrigeration) brands. Roughly two-thirds of its business is commercial HVAC, where it sells energy-efficient chillers, rooftop units, controls, and a growing base of recurring service and aftermarket contracts. The company positions itself around sustainability and building decarbonization, and it has expanded aggressively into data-center cooling through acquisitions such as Stellar Energy.

Full TT guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• LII drivers: Replacement demand and installed base; Regulatory tailwinds and product mix.
• TT drivers: Data-center cooling demand; Commercial HVAC and backlog.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: Lennox trades at a premium mid-20s earnings multiple, so any slowdown in volumes, pricing, or margins can compress the stock quickly. For TT, the most cited risk is valuation: TT trades at a premium price-to-earnings multiple well above the broader industrial group and its own historical average, so any growth stumble could compress the multiple.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick LII if you believe its drivers more; TT if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the LII and TT guides.

LII. Lennox reported Q1 2026 revenue of about $1.14 billion (up roughly 6%) and diluted EPS of about $3.35, beating estimates even as operating margin slipped on cost inflation and higher interest expense. Management guided full-year 2026 revenue growth to about 8%, adjusted EPS of roughly $23.50 to $25.00, and free cash flow of $750 to $850 million. With shares around the low-$500s, the trailing multiple sits in the low-to-mid 20s, a premium reflecting the replacement-driven, high-margin model.

TT. Trane beat expectations in Q1 2026 and raised full-year guidance to roughly 7% organic revenue growth and adjusted EPS of about $14.75 to $14.95. A record backlog above $10 billion supports near-term visibility. The trailing P/E in the mid-30s sits well above the typical industrial multiple, reflecting the market's confidence in the growth story.

Headline figures (approximate, July 2026): LII shows revenue (ttm) ~$5.3B, q1 2026 revenue ~$1.14B (up ~6% YoY), q1 2026 diluted eps ~$3.35 (down ~8% YoY), 2026 adjusted eps guidance ~$23.50 to $25.00; TT shows market cap ~$105 billion, revenue (ttm) ~$21.3 billion, net income (ttm) ~$3.0 billion, q1 2026 revenue ~$4.97 billion (up ~6% YoY).

LII and TT are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined LII and TT exposure against your real portfolio. It is not an investment adviser.