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Side-by-side financial comparison of A. O. Smith (AOS) and COMFORT SYSTEMS USA INC (FIX). Click either name above to swap in a different company.
COMFORT SYSTEMS USA INC is the larger business by last-quarter revenue ($2.6B vs $912.5M, roughly 2.9× A. O. Smith). A. O. Smith runs the higher net margin — 13.7% vs 12.5%, a 1.2% gap on every dollar of revenue. On growth, COMFORT SYSTEMS USA INC posted the faster year-over-year revenue change (41.7% vs 0.0%). COMFORT SYSTEMS USA INC produced more free cash flow last quarter ($402.4M vs $165.5M). Over the past eight quarters, COMFORT SYSTEMS USA INC's revenue compounded faster (31.2% CAGR vs -3.4%).
A. O. Smith Corporation is an American manufacturer of both residential and commercial water heaters and boilers, and the largest manufacturer and marketer of water heaters in North America. It also supplies water treatment and purification products in the Asian market. The company has 27 locations worldwide, including five manufacturing facilities in North America, as well as plants in Bengaluru in India, Nanjing in China and Veldhoven in The Netherlands.
Comfort Systems USA, Inc. is an American company that provides mechanical and electrical contracting services, primarily HVAC, plumbing, piping and controls, off-site construction, monitoring and fire protection, and installation and servicing of electrical systems.
AOS vs FIX — Head-to-Head
Income Statement — Q4 2025 vs Q4 2025
| Metric | | |
|---|---|---|
| Revenue | $912.5M | $2.6B |
| Net Profit | $125.4M | $330.8M |
| Gross Margin | 38.4% | 25.5% |
| Operating Margin | 17.9% | 16.1% |
| Net Margin | 13.7% | 12.5% |
| Revenue YoY | 0.0% | 41.7% |
| Net Profit YoY | 14.3% | 126.8% |
| EPS (diluted) | $0.89 | $9.35 |
Green = leading value per metric. Periods may differ when fiscal calendars don't align.
8-Quarter Revenue & Profit Trend
Side-by-side quarterly history. Quarters aligned by calendar period so offset fiscal years line up.
| Q4 25 | $912.5M | $2.6B | ||
| Q3 25 | $942.5M | $2.5B | ||
| Q2 25 | $1.0B | $2.2B | ||
| Q1 25 | $963.9M | $1.8B | ||
| Q4 24 | $912.4M | $1.9B | ||
| Q3 24 | $902.6M | $1.8B | ||
| Q2 24 | $1.0B | $1.8B | ||
| Q1 24 | $978.8M | $1.5B |
| Q4 25 | $125.4M | $330.8M | ||
| Q3 25 | $132.0M | $291.6M | ||
| Q2 25 | $152.2M | $230.8M | ||
| Q1 25 | $136.6M | $169.3M | ||
| Q4 24 | $109.7M | $145.9M | ||
| Q3 24 | $120.1M | $146.2M | ||
| Q2 24 | $156.2M | $134.0M | ||
| Q1 24 | $147.6M | $96.3M |
| Q4 25 | 38.4% | 25.5% | ||
| Q3 25 | 38.7% | 24.8% | ||
| Q2 25 | 39.3% | 23.5% | ||
| Q1 25 | 38.9% | 22.0% | ||
| Q4 24 | 37.1% | 23.2% | ||
| Q3 24 | 37.4% | 21.1% | ||
| Q2 24 | 38.7% | 20.1% | ||
| Q1 24 | 39.3% | 19.3% |
| Q4 25 | 17.9% | 16.1% | ||
| Q3 25 | 18.6% | 15.5% | ||
| Q2 25 | 20.4% | 13.8% | ||
| Q1 25 | 19.1% | 11.4% | ||
| Q4 24 | 10.1% | 12.1% | ||
| Q3 24 | 19.5% | 11.2% | ||
| Q2 24 | 21.9% | 10.2% | ||
| Q1 24 | 22.0% | 8.8% |
| Q4 25 | 13.7% | 12.5% | ||
| Q3 25 | 14.0% | 11.9% | ||
| Q2 25 | 15.0% | 10.6% | ||
| Q1 25 | 14.2% | 9.2% | ||
| Q4 24 | 12.0% | 7.8% | ||
| Q3 24 | 13.3% | 8.1% | ||
| Q2 24 | 15.2% | 7.4% | ||
| Q1 24 | 15.1% | 6.3% |
| Q4 25 | $0.89 | $9.35 | ||
| Q3 25 | $0.94 | $8.25 | ||
| Q2 25 | $1.07 | $6.53 | ||
| Q1 25 | $0.95 | $4.75 | ||
| Q4 24 | $0.75 | $4.08 | ||
| Q3 24 | $0.82 | $4.09 | ||
| Q2 24 | $1.06 | $3.74 | ||
| Q1 24 | $1.00 | $2.69 |
Balance Sheet & Financial Strength
Snapshot of each company's liquidity, leverage and book value from the latest quarter.
| Metric | | |
|---|---|---|
| Cash + ST InvestmentsLiquidity on hand | $193.2M | $981.9M |
| Total DebtLower is stronger | $155.0M | $145.2M |
| Stockholders' EquityBook value | $1.9B | $2.4B |
| Total Assets | $3.1B | $6.4B |
| Debt / EquityLower = less leverage | 0.08× | 0.06× |
8-quarter trend — quarters aligned by calendar period.
| Q4 25 | $193.2M | $981.9M | ||
| Q3 25 | $172.8M | $860.5M | ||
| Q2 25 | $177.9M | $331.7M | ||
| Q1 25 | $200.2M | $204.8M | ||
| Q4 24 | $276.1M | $549.9M | ||
| Q3 24 | $255.6M | $415.6M | ||
| Q2 24 | $233.3M | $199.4M | ||
| Q1 24 | $303.1M | $100.8M |
| Q4 25 | $155.0M | $145.2M | ||
| Q3 25 | — | $136.0M | ||
| Q2 25 | — | $73.0M | ||
| Q1 25 | — | $67.8M | ||
| Q4 24 | $193.2M | $68.3M | ||
| Q3 24 | — | $62.3M | ||
| Q2 24 | — | $73.4M | ||
| Q1 24 | — | $77.0M |
| Q4 25 | $1.9B | $2.4B | ||
| Q3 25 | $1.8B | $2.2B | ||
| Q2 25 | $1.8B | $2.0B | ||
| Q1 25 | $1.9B | $1.8B | ||
| Q4 24 | $1.9B | $1.7B | ||
| Q3 24 | $1.9B | $1.6B | ||
| Q2 24 | $1.9B | $1.5B | ||
| Q1 24 | $1.9B | $1.4B |
| Q4 25 | $3.1B | $6.4B | ||
| Q3 25 | $3.2B | $5.8B | ||
| Q2 25 | $3.2B | $5.1B | ||
| Q1 25 | $3.3B | $4.6B | ||
| Q4 24 | $3.2B | $4.7B | ||
| Q3 24 | $3.2B | $4.4B | ||
| Q2 24 | $3.2B | $4.2B | ||
| Q1 24 | $3.2B | $3.9B |
| Q4 25 | 0.08× | 0.06× | ||
| Q3 25 | — | 0.06× | ||
| Q2 25 | — | 0.04× | ||
| Q1 25 | — | 0.04× | ||
| Q4 24 | 0.10× | 0.04× | ||
| Q3 24 | — | 0.04× | ||
| Q2 24 | — | 0.05× | ||
| Q1 24 | — | 0.06× |
Cash Flow & Capital Efficiency
How much cash each business actually produces after reinvestment. Cash flow is harder to manipulate than net income.
| Metric | | |
|---|---|---|
| Operating Cash FlowLast quarter | $183.1M | $468.5M |
| Free Cash FlowOCF − Capex | $165.5M | $402.4M |
| FCF MarginFCF / Revenue | 18.1% | 15.2% |
| Capex IntensityCapex / Revenue | 1.9% | 2.5% |
| Cash ConversionOCF / Net Profit | 1.46× | 1.42× |
| TTM Free Cash FlowTrailing 4 quarters | $546.0M | $1.0B |
8-quarter trend — quarters aligned by calendar period.
| Q4 25 | $183.1M | $468.5M | ||
| Q3 25 | $255.4M | $553.3M | ||
| Q2 25 | $139.6M | $252.5M | ||
| Q1 25 | $38.7M | $-88.0M | ||
| Q4 24 | $221.9M | $210.5M | ||
| Q3 24 | $195.9M | $302.2M | ||
| Q2 24 | $57.4M | $189.9M | ||
| Q1 24 | $106.6M | $146.6M |
| Q4 25 | $165.5M | $402.4M | ||
| Q3 25 | $240.6M | $517.9M | ||
| Q2 25 | $122.5M | $221.2M | ||
| Q1 25 | $17.4M | $-110.2M | ||
| Q4 24 | $191.3M | $169.8M | ||
| Q3 24 | $163.4M | $280.1M | ||
| Q2 24 | $34.5M | $166.5M | ||
| Q1 24 | $84.6M | $121.6M |
| Q4 25 | 18.1% | 15.2% | ||
| Q3 25 | 25.5% | 21.1% | ||
| Q2 25 | 12.1% | 10.2% | ||
| Q1 25 | 1.8% | -6.0% | ||
| Q4 24 | 21.0% | 9.1% | ||
| Q3 24 | 18.1% | 15.5% | ||
| Q2 24 | 3.4% | 9.2% | ||
| Q1 24 | 8.6% | 7.9% |
| Q4 25 | 1.9% | 2.5% | ||
| Q3 25 | 1.6% | 1.4% | ||
| Q2 25 | 1.7% | 1.4% | ||
| Q1 25 | 2.2% | 1.2% | ||
| Q4 24 | 3.4% | 2.2% | ||
| Q3 24 | 3.6% | 1.2% | ||
| Q2 24 | 2.2% | 1.3% | ||
| Q1 24 | 2.2% | 1.6% |
| Q4 25 | 1.46× | 1.42× | ||
| Q3 25 | 1.93× | 1.90× | ||
| Q2 25 | 0.92× | 1.09× | ||
| Q1 25 | 0.28× | -0.52× | ||
| Q4 24 | 2.02× | 1.44× | ||
| Q3 24 | 1.63× | 2.07× | ||
| Q2 24 | 0.37× | 1.42× | ||
| Q1 24 | 0.72× | 1.52× |
Financial Flow Comparison
Revenue → gross profit → operating profit → net profit for each company.
Revenue Breakdown by Segment
AOS
| North America Segment | $713.7M | 78% |
| Rest Of World | $158.3M | 17% |
| Other | $40.5M | 4% |
FIX
| Electrical Segment | $823.7M | 31% |
| Manufacturing Customer | $542.7M | 21% |
| Existing Building Construction | $491.4M | 19% |
| Healthcare Sector Customer | $220.8M | 8% |
| Service Projects | $153.0M | 6% |
| Education | $137.5M | 5% |
| Government Customer | $131.0M | 5% |
| Office Building Customer | $88.2M | 3% |
| Other Customer | $40.7M | 2% |
| Multi Family And Residential | $33.7M | 1% |
