Most HVAC and plumbing contractors learned their trade from someone else. They know how to diagnose a failing compressor, clear a blocked main line, replace a water heater. What nobody taught them was how to price the work.
So they guess. Or they Google what competitors charge. Or they do what their old boss did, even if their old boss was also guessing.
The result is a business that stays busy but never quite gets ahead. Trucks running six days a week, phones ringing constantly, and at the end of the month the numbers don't add up the way they should.
Pricing isn't a feeling. It's math. And once you understand the math, everything else gets easier.
Why Most Small Contractors Underprice Their Work
Underpricing is the single most common financial mistake in the trades. It doesn't usually happen because contractors are bad at business — it happens because the true cost of doing a job is harder to see than it looks.
The obvious costs are easy. Equipment, materials, refrigerant, parts. You know what those cost because you paid for them.
The hidden costs are where contractors bleed money. The hour of drive time that doesn't get billed. The warranty callback that costs you a full service call. The slow weeks in spring and fall when you're still paying your techs and your insurance and your truck payments. The job that ran three hours longer than quoted because the homeowner added scope in the driveway.
When you price only for the visible costs, you're subsidizing everything else out of your own pocket. Profit doesn't disappear all at once — it erodes job by job, a little at a time, until you look at your bank account and wonder where it all went.
The Three Numbers Every Contractor Needs to Know
Before you can price a single job correctly, you need three numbers. These are your foundation.
Your true hourly cost. Take everything it costs to run your business for a year — technician wages, truck payments, fuel, insurance, tools, software subscriptions, your own salary, rent if you have it, marketing, accounting. Divide that by the number of billable hours your team actually works in a year (not the hours they're on the clock — the hours they're generating revenue on a job). That's your true hourly cost. Most contractors are shocked by this number the first time they calculate it. If your true hourly cost is $95 and you're charging $85 an hour, you're losing money on every job before you add a single dollar of profit.
Your desired profit margin. This isn't what's left over after you pay your bills. Profit is a planned percentage of revenue that you set intentionally. For a healthy small HVAC or plumbing business, target 15 to 25 percent net profit. To hit that, you need to build it into your pricing from the start, not hope it appears at the end.
Your overhead percentage. Add up all your fixed costs — the ones you pay whether you do zero jobs or a hundred jobs this month. Divide that by your total monthly revenue. That percentage needs to be covered by every job you price, before you make a dollar of profit.
Once you have these three numbers, pricing becomes a formula rather than a guess.
Flat Rate vs. Time and Materials: Which Is Right for Your Business
This is the pricing debate that never really ends in the trades. Here's the honest breakdown.
Time and materials pricing — charging an hourly rate plus actual parts cost — feels fair and transparent. The problem is that it punishes efficiency. A skilled technician who diagnoses and fixes a problem in 45 minutes earns you less than a less experienced tech who takes two hours on the same job. It also creates friction with customers who watch the clock and question every minute.
Flat rate pricing — a fixed price for a defined scope of work regardless of how long it takes — rewards efficiency and makes the sale easier. The customer knows the price before the work starts. Your tech doesn't have to justify their time. And when you build your flat rates correctly, faster jobs improve your effective hourly rate rather than reducing your revenue.
Most successful small HVAC and plumbing shops run flat rate for service calls and common repairs, and use a time-and-materials or cost-plus model for larger installation projects where scope can change. That combination gives you the best of both approaches.
How to Build a Flat Rate Price Book That Actually Works
A price book is only as good as the math behind it. Here's how to build one correctly.
Start with your true hourly cost from the calculation above. Add your target profit margin. That gives you your minimum billable rate — the floor below which every job loses money.
For each service you offer, estimate the time honestly. Not the best-case time. The average time including diagnosis, the trip to the supply house when the first part doesn't fit, and the conversation with the customer at the end. Add your parts cost at your actual cost — not what the supplier says, what you actually paid after your account discount.
Apply your overhead percentage and your profit margin on top of that combined labor and materials number. That's your flat rate price.
Build this for your twenty most common jobs first. AC tune-up. Capacitor replacement. Thermostat installation. Water heater replacement. Drain cleaning. Toilet replacement. Those twenty jobs probably represent 70 percent of your call volume. Once those are priced correctly, tackle the less common ones.
Review your price book at least twice a year. Equipment costs change. Labor costs go up. Your overhead structure changes as your business grows. A price book you built two years ago and haven't touched is probably costing you money right now.
The Good-Better-Best Proposal Strategy
One of the most effective pricing strategies in the trades has nothing to do with calculating costs — it's about how you present options to the customer.
Instead of showing a homeowner one price for one solution, you give them three choices at three price points.
Good is the minimum viable solution. It solves the immediate problem at the lowest price. A repair rather than a replacement. A standard efficiency unit rather than a high-efficiency one.
Better is your recommended solution. It's priced to be your most common close. Better equipment, better warranty, a bit more peace of mind.
Best is the premium option. Top-of-the-line equipment, extended warranty, priority service agreement, annual maintenance included. Not everyone takes it — but the people who do are your most valuable customers.
This approach does two things simultaneously. It prevents the customer from saying "I need to get another quote" because they already feel like they've compared options. And it consistently pulls your average ticket up because some portion of customers will always choose the middle or top option when it's presented clearly.
Contractors who switch to good-better-best proposals typically see average ticket increases of 15 to 30 percent without changing a single thing about their service delivery.
Seasonal Pricing and Demand Surges
HVAC contractors sit on one of the most predictable demand patterns in any service industry. You know exactly when your phones are going to ring off the hook and you know exactly when they're going to go quiet.
Peak demand — July heat waves, January freezes, the first really hot week of May — is when you have the most pricing power. Customers with a broken AC at 95 degrees are not shopping for the cheapest quote. They want someone who can show up today. Your pricing should reflect that.
Shoulder season — spring and fall — is when you compete hardest for maintenance work, tune-ups, and system upgrades. This is where promotional pricing and service agreements earn their keep. A maintenance agreement customer in September keeps your techs busy and pays you recurring revenue regardless of whether the weather cooperates.
Many contractors are uncomfortable charging more during peak demand. The framing that helps: you're not price gouging. You're compensating for the fact that your technicians are working harder, skipping breaks, running emergency calls on weekends. That has a real cost. Pricing it correctly isn't gouging — it's sustainability.
How HeyJack Makes Pricing Easier
HeyJack is built around the idea that your pricing should work for you, not against you.
You input your rates and your most common job types once. The AI builds professional proposals instantly, pulling your correct pricing into every estimate without manual recalculation. Good-better-best options are built into the proposal format, so every customer sees your full range of solutions before they decide.
The result is faster estimates, more consistent pricing, and proposals that close at higher rates — from the same leads you're already generating.
Start your free 30-day trial at HeyJack and send your first professional proposal today.