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Lennox International vs Tecogen: revenue, profit, margins and growth compared

Lennox International brought in $5.2B of revenue in fiscal 2025, Tecogen $27.1M in fiscal 2025. Revenue changed by -2.7% at Lennox International and +19.7% at Tecogen on the year before, so Tecogen grew faster. Lennox International kept 15.5% of its revenue as net profit, Tecogen -30.5%. Free cash flow was $638.8M at Lennox International and -$10.3M at Tecogen.

Side by side, latest fiscal year

LIITGEN
Fiscal year endedFY2025 (December 31, 2025)FY2025 (December 31, 2025)
Revenue$5.2B$27.1M
Revenue growth-2.7%+19.7%
Net income$805.8M-$8.2M
Net margin15.5%-30.5%
Free cash flow$638.8M-$10.3M
Free cash flow margin12.3%-38.1%
Earnings per share (diluted)$22.79-$0.30
Cash$34.2M$12.4M
Debt$1.4Bn/a
Price to earnings16.4n/a
Market value$12.9B$92.1M
Dividend yield1.35%n/a
Rank by revenue in sector#121 of 451 · Industrials#419 of 451 · Industrials

Over the years

Revenue
LII FY2018: $3.9BLII FY2019: $3.8BLII FY2020: $3.6BLII FY2021: $4.2BLII FY2022: $4.7BLII FY2023: $5BLII FY2024: $5.3BLII FY2025: $5.2BTGEN FY2018: $35.9MTGEN FY2019: $33.4MTGEN FY2020: $28.3MTGEN FY2021: $24.4MTGEN FY2022: $25MTGEN FY2023: $25.1MTGEN FY2024: $22.6MTGEN FY2025: $27.1MFY18FY19FY20FY21FY22FY23FY24FY25
LII $5.2BTGEN $27.1M
Net income
LII FY2018: $359MLII FY2019: $408.7MLII FY2020: $356.3MLII FY2021: $464MLII FY2022: $497.1MLII FY2023: $591.2MLII FY2024: $811.1MLII FY2025: $805.8MTGEN FY2018: -$5.7MTGEN FY2019: -$4.7MTGEN FY2020: -$6.2MTGEN FY2021: $3.7MTGEN FY2022: -$2.4MTGEN FY2023: -$4.6MTGEN FY2024: -$4.8MTGEN FY2025: -$8.2MFY18FY19FY20FY21FY22FY23FY24FY25
LII $805.8MTGEN -$8.2M
Net margin
LII FY2018: 9.2%LII FY2019: 10.7%LII FY2020: 9.8%LII FY2021: 11.1%LII FY2022: 10.5%LII FY2023: 11.9%LII FY2024: 15.2%LII FY2025: 15.5%TGEN FY2018: -15.9%TGEN FY2019: -14.1%TGEN FY2020: -21.8%TGEN FY2021: 15.1%TGEN FY2022: -9.8%TGEN FY2023: -18.3%TGEN FY2024: -21.0%TGEN FY2025: -30.5%FY18FY19FY20FY21FY22FY23FY24FY25
LII 15.5%TGEN -30.5%
Revenue growth
LII FY2019: -2.0%LII FY2020: -4.5%LII FY2021: +15.4%LII FY2022: +12.5%LII FY2023: +5.6%LII FY2024: +7.2%LII FY2025: -2.7%TGEN FY2019: -6.8%TGEN FY2020: -15.5%TGEN FY2021: -13.6%TGEN FY2022: +2.5%TGEN FY2023: +0.5%TGEN FY2024: -10.0%TGEN FY2025: +19.7%FY19FY20FY21FY22FY23FY24FY25
LII -2.7%TGEN +19.7%
Free cash flow
LII FY2018: $400.3MLII FY2019: $290.5MLII FY2020: $533.9MLII FY2021: $408.7MLII FY2022: $201.2MLII FY2023: $486MLII FY2024: $782.1MLII FY2025: $638.8MTGEN FY2018: -$4.7MTGEN FY2019: -$4.6MTGEN FY2020: $1.3MTGEN FY2021: $373.6KTGEN FY2022: -$1.7MTGEN FY2023: -$864.7KTGEN FY2024: $3.1MTGEN FY2025: -$10.3MFY18FY19FY20FY21FY22FY23FY24FY25
LII $638.8MTGEN -$10.3M

Fiscal years as each company reports them; the two may end in different months.

Questions about Lennox International and Tecogen

Which is bigger by revenue, Lennox International or Tecogen?

Lennox International is bigger by revenue: $5.2B in fiscal 2025, against $27.1M for Tecogen in fiscal 2025.

Which keeps more of its revenue as profit, Lennox International or Tecogen?

Lennox International had a net margin of 15.5% in fiscal 2025; Tecogen had -30.5% in fiscal 2025.

Which grew revenue faster, Lennox International or Tecogen?

In their latest fiscal years revenue changed by -2.7% at Lennox International and +19.7% at Tecogen.

Where do these numbers come from?

From the annual reports each company files with the SEC (10-K, or 20-F and 40-F for foreign companies), read from their XBRL data. Margins and growth are simple arithmetic on those figures. Nothing here is a recommendation.

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