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An HVAC insurance premium increase with no claims almost always comes from two separate forces, and only one of them is the market. In 2026, commercial insurance rate movement is line-specific: commercial auto and umbrella keep climbing while property and workers comp have softened. Your own growth is the second force, because more payroll, higher receipts, and added service vans raise the exposure your premium is built on.
A clean loss year does not cancel either force, and a claim from two years ago may still sit in your workers comp rating. Here is how to read the increase line by line, then decide whether to accept it or shop it.
A no-claims HVAC premium increase is normal, and it usually is not one thing. Two independent forces move your renewal: the market rate for each line, which in 2026 is up sharply on commercial auto but down on property and workers comp, and your own exposure, meaning payroll, receipts, and vehicles. A clean year prevents surcharges, but it does not freeze the base rate or shrink your business.
The "no claims" part controls one thing only: the experience surcharge a carrier adds after a bad loss year. It does not touch the underlying rate the carrier files, and it does not shrink the payroll or fleet the premium is calculated on. That gap is why an angry owner and a fair renewal can both be right at the same time. For the full context on how an established HVAC program is priced at renewal, the companion guide walks the entire stack.
Commercial insurance rates in 2026 are not moving as one number. Overall commercial premiums fell 1.2% in the first quarter, the first decline since 2017, yet the drop is uneven. A few liability lines are still climbing hard while property and workers comp have softened. The table breaks the first-quarter movement out by line, per the CIAB Q1 2026 market survey.
| Line | Q1 2026 rate change |
|---|---|
| Commercial auto | +5.8% (59th straight quarterly increase) |
| Umbrella / excess | +4.8% |
| General liability | +2.6% |
| Workers compensation | -3.7% |
| Commercial property | -5.5% |
| Overall commercial | -1.2% |
Account size tells the same story from another angle. Large accounts averaged a 2.7% decrease and medium accounts fell 1.9%, but small accounts still rose 1.1%. A smaller HVAC shop can sit inside a softening market and still open a renewal that went up. (Yes, a falling market can still hand you a higher bill.)
Yes. Your HVAC premium is rate times exposure, and exposure is your own volume. General liability is rated on your receipts, workers comp on your payroll, and commercial auto on each vehicle you run. If revenue climbed, you staffed up for summer, or you added service vans, the exposure the premium sits on went up, so the bill rose even when the rate per unit held flat or fell.
Growth alone can produce a double-digit renewal in a market where rates are falling. A clean year with 20% more payroll is still 20% more workers comp exposure, and the carrier rates that payroll under HVAC class code 5537. None of it shows up as a claim, which is why the increase blindsides owners who expected a flat number. The reconciliation comes later, when the carrier trues up your reported figures against what you actually ran, which is how exposure gets reconciled at the year-end audit.
Commercial auto and umbrella are the two lines still hardening in 2026, and the driver is the cost of liability claims, not your driving record. Larger jury awards and rising legal costs, which the industry calls social inflation, have pushed commercial auto up for 59 straight quarters and 5.8% in the first quarter alone, per the CIAB survey. Umbrella sits directly above your auto and general liability, so when those claim costs rise, the excess layer climbs with them.
Marathon Strategies counted 135 corporate verdicts of $10 million or more in 2024, the highest on record, and verdicts above $100 million nearly doubled that year. Carriers price auto and umbrella off that broad loss trend, not off one clean record, which is why a spotless HVAC fleet still absorbs the increase. When a rate hike turns into a dropped account, the guide on when a rate hike turns into a non-renewal covers what happens next.
A clean current year does not clear your workers comp experience rating, because the rating is built on roughly three prior policy years and leaves out the most recent one. A claim from two years ago is still in the calculation, and this year's clean record has not cycled in yet. Misclassified or drifting payroll, like a service tech coded as an installer, can also raise the base premium before the rating factor even applies.
That lag is how one claim follows your mod for three years. One mechanical contractor's workers comp rose about 9% at renewal with no new claims, because a slip-and-fall from two years earlier had entered the rating window before the clean year could count. The line itself looks profitable: a calendar-year 2025 combined ratio of 91, its 12th straight winning year, per Insurance Journal's coverage of NCCI's 2026 State of the Line report. Accident-year results ran harder at 102, the first reading above 100 since the COVID years, with California at 129.
No single number defines your workers comp costs, and even a small upward move in your rating factor matters, because what a mod above 1.0 costs an HVAC company adds up across every renewal.
Start by separating the increase into rate versus exposure, so you know what you are actually arguing about. Ask your broker for the renewal broken out by line, confirm your payroll and receipts estimates are current rather than padded, and have the experience-mod worksheet checked for errors (carriers rarely hand it over unless you ask). Then benchmark the number against the market before you accept it or shop it.
A renewal that rises only on commercial auto in 2026 is defensible, because that line is hardening for everyone. A broad jump across every line, or an increase that outpaces your own growth, is worth taking to the market. Coverwatch, a flat-fee brokerage that quotes across 60 or more carriers, benchmarks an HVAC renewal by line and shows whether the increase traces to the market or to your incumbent carrier. That mechanism, rather than a promised discount, is the real reason to shop. Working out whether to shop your program or stay put comes down to that line-by-line read.
Have Coverwatch break your HVAC renewal out by line and benchmark it against the market before you accept the number, as part of its flat-fee contractor insurance practice.
Yes. A renewal moves on two things beyond your claims: the market rate for each line and your own exposure. In 2026, commercial auto and umbrella rates are up while property and workers comp are down. Any growth in payroll, receipts, or vehicles raises the premium those rates apply to, even in a clean year.
It depends on the line. Overall commercial premiums fell 1.2% in Q1 2026, but commercial auto rose 5.8%, umbrella 4.8%, and general liability 2.6%, while property fell 5.5% and workers comp fell 3.7%, per CIAB. Small accounts still averaged a 1.1% increase even as large accounts fell 2.7%.
Usually. The experience modification rating uses roughly three prior policy years and skips the most recent one, so a single claim keeps influencing your premium for about three years before it drops out. A clean current year does not erase it right away, because the clean year has not entered the rating window yet.
Not automatically. Get the renewal broken out by line first. An increase concentrated on commercial auto is largely market-driven and hard to escape by switching. A broad jump across every line, or one that outpaces your own payroll and fleet growth, is the case worth taking to the market to benchmark against other carriers.
Commercial auto is the hardest commercial line in 2026, up 5.8% in the first quarter for a 59th straight quarterly increase, driven by rising liability claim and litigation costs rather than your own record. Umbrella tends to follow it upward, while property and workers comp have softened and may have renewed flat or down.
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