Flat-Rate vs Hourly Pricing
Almost every service call comes down to how you charge for it. Here is an honest, field-level look at flat-rate and hourly pricing, what each one does to your paycheck and your customer's trust, and when one clearly beats the other.
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In This Guide
The Two Models, Defined
Every HVAC company bills one of two ways, and the difference shapes almost everything downstream: how you write tickets, how you get paid, and how a homeowner feels when they sign.
Flat-Rate (Fixed Pricing)
You quote one all-in price for a defined repair — say “replace dual run capacitor, $329” — before you turn a wrench. The price comes from a price book that already bakes in parts, labor time, overhead, and profit. The customer knows the total before approving the work.
Hourly (Time & Materials)
You bill a labor rate per hour (often billed in 15- or 30-minute increments) plus the marked-up cost of parts, plus a trip or diagnostic fee. The final number isn't known until the job is done and the clock stops. This is the traditional T&M approach.
A quick reality check that surprises a lot of new techs: flat-rate is not a way to charge more for the same work. It is a way to charge a predictable amount. Whether the customer pays more or less than they would have hourly depends entirely on how honest the price book is and how fast the tech is.
The Math Behind a Real Labor Rate
Both models rest on the same foundation: what does an hour of a technician's time actually cost the company? Techs who understand this stop resenting the price on the invoice, because they can see where it goes.
Billable-Hour Reality
Effective rate = (Wage + Burden + Overhead + Profit) ÷ Billable Hours
A tech paid $30/hr does not generate 40 billable hours a week. Drive time, restocking, callbacks, training, and warranty work eat into it. A shop that captures 28–32 billable hours out of a 40-hour week is doing well.
Here is why a “$30/hr tech” has to be billed at well over $100/hr for the company to survive:
- Labor burden — payroll taxes, workers' comp, health insurance, and PTO typically add 25–40% on top of the base wage.
- Truck and tools — the van payment, fuel, insurance, gauges, recovery machine, and stocked parts inventory.
- Overhead — the office, dispatch, software, licensing, advertising, and the owner who answers the phone at 9 p.m.
- Profit — the margin that funds new trucks, raises, and a cushion for the slow shoulder seasons.
Run those numbers and a fully loaded cost of $85–$110 per billable hour is normal for a residential shop, before a dollar of profit. That is the figure a fair flat-rate price book and a fair hourly rate both have to cover.
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Worked Example: Same Job, Two Prices
Let's run one real call two ways. A no-cooling call: the outdoor fan hums but won't spin, and you find a failed 45/5 MFD dual run capacitor on a 3-ton condenser. Your part cost is $22 wholesale.
Hourly / T&M Version
Step 1: Diagnostic / trip fee
$89 to roll the truck and diagnose
Step 2: Labor at $125/hr, 0.5 hr on site to swap the cap
0.5 × $125 = $62.50 (many shops bill a 1-hour minimum → $125)
Step 3: Part with markup (~3x)
$22 cost → billed at $66
Total (1-hr minimum):
$89 + $125 + $66 = $280
Flat-Rate Version
The price book lists “Dual run capacitor replacement, up to 55 MFD” at a single price that already includes the diagnostic, the part, the labor allowance, overhead, and the 1-year warranty on the repair.
One number, quoted and approved before the tech opens the disconnect.
The takeaway: the two totals land close together ($280 vs $329). The difference isn't the dollar amount — it's that the flat-rate customer knew the price up front and the hourly customer had to trust the meter. And if that cap swap had fought you for an extra 40 minutes, the hourly bill climbs while the flat-rate price does not move.
Field note: when you replace a run capacitor, always verify the microfarad rating against the nameplate and confirm the replacement is within tolerance (industry practice: replace if the measured value is more than 6% off rated). A 45/5 cap reading 38 MFD on the compressor side is failed even if the fan still spins.
What Each Model Does to Techs
This is where the debate gets personal, because the model you work under changes what a good day looks like.
Flat-Rate: The Tech View
- Speed pays off. Finish a $329 job in 30 minutes and the shop still books the full price. Efficiency rewards you instead of shorting the invoice.
- No awkward clock-watching. You never have to explain why the same repair took you 20 minutes longer than the last guy.
- Cleaner selling. The price is on paper; you present it, you don't improvise it.
- Risk: if the price book pushes pay-per-task incentives too hard, it can tempt over-selling. A good shop guards against that with ethics and QA.
Hourly: The Tech View
- Honest to a fault. Slow, difficult jobs get paid for the time they actually take.
- No sales pressure. You're paid to fix things, not to hit a ticket average.
- Downside: being fast and skilled earns you less revenue per job, which is backwards.
- Downside: every minute is scrutinized. Comebacks and slow parts runs create friction with the customer over the bill.
The blunt summary: hourly rewards time, flat-rate rewards competence. A skilled tech almost always earns more under a well-built flat-rate system, which is a big reason the industry has drifted toward it over the last two decades.
What Each Model Does to Customers
Customers rarely care about your labor-burden spreadsheet. They care about two things: predictability and fairness. The models trade off against each other on exactly those axes.
- Flat-rate removes fear. The homeowner approves a known number and stops watching the clock. No surprise on the invoice is the single biggest driver of good reviews.
- Flat-rate can feel expensive on easy jobs. When a customer sees you swap a $22 part in ten minutes for $329, some feel overcharged — even though they're paying for the knowledge to diagnose it, not the ten minutes.
- Hourly feels transparent… until it isn't. “$125 an hour plus parts” sounds honest, but an open-ended meter makes many homeowners anxious, especially on a job that's hard to scope.
- Hourly punishes complex diagnoses. The customer with the intermittent, hard-to-find fault pays the most under hourly, which feels unfair to the person who least understands why.
How you communicate the price matters as much as the model itself. Whichever you use, showing the customer what you found — a photo of the bulged capacitor, the measured MFD, the burnt contactor — converts a number on paper into a decision they feel good about.
Side-by-Side Comparison
| Factor | Flat-Rate | Hourly (T&M) |
|---|---|---|
| Price known up front | Yes | No |
| Rewards fast, skilled techs | Yes | No |
| Fair on unusually long jobs | Shop absorbs risk | Customer pays actual |
| Customer price anxiety | Low | Higher |
| Setup effort | High (build a price book) | Low (set a rate) |
| Best fit | Repairs, replacements, maintenance | Odd diagnostics, remodels, commercial project work |
| Revenue predictability | Strong | Variable |
Which Model Should You Use?
For most residential and light-commercial service work, flat-rate has won the argument — and for defensible reasons. But the smartest shops aren't purists. They pick the model that fits the work in front of them.
Lean flat-rate when…
- You run residential service and repair — capacitors, contactors, motors, ignitors, TXVs.
- You do maintenance agreements and equipment replacements.
- Your customers value a firm price and you can build (or buy) a solid price book.
Lean hourly when…
- The job can't be scoped cleanly — an intermittent fault, a mystery leak, a decades-old boiler.
- You're doing new construction, retrofits, or custom commercial project work billed against a contract.
- You're a subcontractor and the GC expects T&M billing.
The Hybrid Most Shops Land On
Charge a diagnostic fee to get on the roof, then present flat-rate repair options the customer approves before you proceed — often waiving the diagnostic if they move forward. It gives the customer a firm price on the actual repair while still protecting the shop for the true wildcards through a not-to-exceed hourly clause. This is where the industry has largely settled.
Common Questions
Is flat-rate just a way to charge more?
No. It's a way to charge predictably. On an easy job the customer may pay a bit more than strict hourly; on a hard one they pay less. Over a year it evens out, and the shop trades a few high-margin easy jobs for the customer-trust value of no surprises.
How do I build a price book from scratch?
Start with your fully loaded hourly cost, assign a realistic labor time to each common repair, add marked-up parts, then add target profit. Many shops license a pre-built price book (Profit Rhino, Callahan Roach, ServiceTitan Pricebook Pro) and tune it to their market rather than building line-by-line.
What markup should I put on parts?
It varies, but a 2x–4x markup on low-cost parts is common because the markup covers stocking, warranty, and the risk of carrying inventory — not just the part. Higher-cost items (compressors, coils) usually carry a lower percentage markup.
Does flat-rate encourage over-selling?
It can, if a shop stacks aggressive per-task incentives on top of it. The fix is culture and QA, not the model: photo documentation, honest diagnostics, and giving the customer the findings so they can decide. Selling a repair the system doesn't need is an ethics problem under any pricing model.
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