Most HVAC owners have a gut feel for which jobs make money. The gut is usually right about the big picture and wrong about the details, and the details are where margin leaks out. After years around the trade, I have heard the same few assumptions over and over. Each one sounds reasonable, and each one costs real money when it goes unchecked.
Warranty jobs feel like a favor you do for the customer, so they often get thrown in a general bucket and forgotten. The reality is more nuanced. Manufacturers frequently cover the part but only part of the labor, or nothing for labor at all, depending on the warranty terms and the age of the unit. If you are completing the repair and then never submitting for reimbursement where it is available, you are donating money.
The fix is simple. Give warranty jobs their own tracking, record what you expect to be reimbursed, and treat that reimbursement as a receivable until it arrives. Once a quarter, review what is still outstanding. Many shops are surprised by how many claims were never filed.
When you quote a replacement system, the equipment price is the obvious cost. But the true cost of getting that system installed includes freight or delivery fees, refrigerant, pads and line sets, disposal of the old unit, permits, and sometimes a crane or extra labor. If your estimate only reflects the equipment invoice plus a generic labor figure, the small items add up fast.
A useful habit is to compare estimates against actuals on every install for a few months. Add up what each job really cost and see how far off the estimate was. If you consistently land 4 or 5 percent over, your pricing is leaving that on the table every time.
Every truck carries stock, and every shop has a shelf of fittings, capacitors, contactors, and refrigerant. When parts leave the shelf without being tied to a job, the cost lands in a general category or does not get recorded at all. Over a year, that can become a surprisingly large number, and you will have no idea which jobs actually consumed it.
You do not need a heavy inventory system to fix this. Even a lightweight process, such as a quick log of what each tech pulled for each job and a periodic count of the high value items like compressors and refrigerant, creates enough visibility to catch shrinkage and to charge jobs appropriately.
A callback happens when a tech has to return to fix something that was supposed to be done right the first time. One here and there is normal. A pattern is a signal. If you do not record callbacks separately, you cannot see whether they are random, concentrated with one tech, tied to one brand of equipment, or tied to a particular type of job.
Tag callback visits so their labor and materials are visible as their own category. At the end of the quarter, look at the total. That number is the price of quality problems, and shrinking it is often the easiest margin improvement available.
Each myth comes from the same habit: treating job costing as something you do once, when you write the estimate, rather than something you check against reality afterward. Estimates are guesses. The books are what happened. The gap between the two is where profit hides.
If you want a place to start, pick your five most common job types and compare estimate to actual on the next ten of each. For a similar approach to pricing models, see our look at flat rate versus time and materials.
Warranty tracking, full equipment cost, parts visibility, and callback tagging are not exciting, but they are some of the most dependable ways to protect margin. Check each myth against your own numbers. You may find the money was there the whole time.
911 Bookkeepers works with HVAC and trades contractors across the Baton Rouge metro and surrounding parishes, building job costing that shows where the margin really goes.
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