Legendary fund manager Li Lu (who Charlie Munger backed) once said, 'The biggest investment risk is not the volatility of prices, but whether you will suffer a permanent loss of capital.' So it seems the smart money knows that debt - which is usually involved in bankruptcies - is a very important factor, when you assess how risky a company is. Importantly, Lennox International Inc. (NYSE:LII) does carry debt. But is this debt a concern to shareholders?

When Is Debt A Problem?

Debt is a tool to help businesses grow, but if a business is incapable of paying off its lenders, then it exists at their mercy. Part and parcel of capitalism is the process of 'creative destruction' where failed businesses are mercilessly liquidated by their bankers. However, a more usual (but still expensive) situation is where a company must dilute shareholders at a cheap share price simply to get debt under control. Having said that, the most common situation is where a company manages its debt reasonably well - and to its own advantage. The first thing to do when considering how much debt a business uses is to look at its cash and debt together.

What Is Lennox International's Net Debt?

The image below, which you can click on for greater detail, shows that Lennox International had debt of US$1.09b at the end of September 2024, a reduction from US$1.44b over a year. However, because it has a cash reserve of US$255.7m, its net debt is less, at about US$836.8m.

How Strong Is Lennox International's Balance Sheet?

The latest balance sheet data shows that Lennox International had liabilities of US$1.32b due within a year, and liabilities of US$1.24b falling due after that. Offsetting this, it had US$255.7m in cash and US$816.5m in receivables that were due within 12 months. So it has liabilities totalling US$1.49b more than its cash and near-term receivables, combined.

Since publicly traded Lennox International shares are worth a very impressive total of US$22.3b, it seems unlikely that this level of liabilities would be a major threat. Having said that, it's clear that we should continue to monitor its balance sheet, lest it change for the worse.

In order to size up a company's debt relative to its earnings, we calculate its net debt divided by its earnings before interest, tax, depreciation, and amortization (EBITDA) and its earnings before interest and tax (EBIT) divided by its interest expense (its interest cover). The advantage of this approach is that we take into account both the absolute quantum of debt (with net debt to EBITDA) and the actual interest expenses associated with that debt (with its interest cover ratio).

Lennox International has a low net debt to EBITDA ratio of only 0.79. And its EBIT covers its interest expense a whopping 21.6 times over. So we're pretty relaxed about its super-conservative use of debt. Also positive, Lennox International grew its EBIT by 22% in the last year, and that should make it easier to pay down debt, going forward. When analysing debt levels, the balance sheet is the obvious place to start. But ultimately the future profitability of the business will decide if Lennox International can strengthen its balance sheet over time. So if you're focused on the future you can check out this free report showing analyst profit forecasts.

Finally, while the tax-man may adore accounting profits, lenders only accept cold hard cash. So the logical step is to look at the proportion of that EBIT that is matched by actual free cash flow. Over the most recent three years, Lennox International recorded free cash flow worth 54% of its EBIT, which is around normal, given free cash flow excludes interest and tax. This free cash flow puts the company in a good position to pay down debt, when appropriate.

Our View

The good news is that Lennox International's demonstrated ability to cover its interest expense with its EBIT delights us like a fluffy puppy does a toddler. And that's just the beginning of the good news since its EBIT growth rate is also very heartening. Looking at the bigger picture, we think Lennox International's use of debt seems quite reasonable and we're not concerned about it. After all, sensible leverage can boost returns on equity. When analysing debt levels, the balance sheet is the obvious place to start. However, not all investment risk resides within the balance sheet - far from it. Be aware that Lennox International is showing 2 warning signs in our investment analysis , you should know about...

If, after all that, you're more interested in a fast growing company with a rock-solid balance sheet, then check out our list of net cash growth stocks without delay.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.