Question 1

What should an HVAC invoice include?

Accepted Answer

Customer name and the property address (these often differ for rentals or commercial accounts), invoice number and date, the unit serviced (make, model, serial — important for warranty work), a description of work performed, parts and materials with cost, labor by the hour or flat-rate, refrigerant by the pound if recharged, applicable trip charge or diagnostic fee, sales tax on materials, and your warranty terms. Manufacturer warranty claims and AHRI certificate references go in the notes if applicable.

Question 2

Should I charge a diagnostic fee separately from labor?

Accepted Answer

Yes. Industry norm is a $75-$200 diagnostic fee — billed as its own line item and credited toward the repair if the customer accepts. The diagnostic compensates for the time and tools needed to identify the issue (manifold gauges, voltmeter, leak detection). Customers who decline the repair still owe the diagnostic. Naming the fee on the invoice avoids the dispute about whether it's billable; verbal-only diagnostic fees frequently get pushed back at payment.

Question 3

How do I bill refrigerant correctly?

Accepted Answer

By the pound, with the type stated (R-410A is the dominant residential refrigerant; R-22 systems are still in service but R-22 is no longer manufactured and trades at $50-$100/lb when available). Show pounds added, type, and unit price on a separate line. EPA Section 608 record-keeping requirements: log the recovery and recharge in your shop records (not on the customer invoice, but the audit trail must exist). Don't combine refrigerant cost into general 'parts' — the high per-pound cost will draw scrutiny otherwise.

Question 4

What payment terms work best for HVAC?

Accepted Answer

Residential service calls: due-on-completion, paid before the truck leaves. Most independent HVAC contractors take card, ACH, or check on-site. New residential install: 50% deposit at contract signing, 50% on completion. Commercial accounts: Net 15 or Net 30 standard. Warranty work: bill the manufacturer through their claim process (separate from the customer invoice if the customer is paying for an out-of-warranty diagnostic only).

Question 5

Do HVAC contractors charge sales tax on labor?

Accepted Answer

Most US states tax tangible materials (parts, refrigerant, equipment) but not labor on residential service-and-repair. New construction installations are sometimes taxed differently — capital improvement vs. repair distinctions in NY, NJ, and others can change the answer. Texas, Connecticut, Hawaii, New Mexico, South Dakota, and West Virginia tax most labor regardless. The cleanest pattern is to itemize parts and labor separately on the invoice and apply tax only to the parts line; verify your state's specific rules with your accountant or state HVAC contractor association.

Question 6

Should the warranty appear on the invoice?

Accepted Answer

Yes — at minimum, your workmanship warranty (typically 1 year on labor) and a reference to the manufacturer's warranty on parts. State your warranty terms explicitly in the notes section: 'Workmanship warranty: 1 year on labor. Manufacturer warranty applies to all parts; warranty registration completed under serial #XXXX.' Customers reference the invoice when something fails 6 months later — your warranty terms need to be on the document, not in a separate email.

HVAC Invoice Template

Features Built for HVAC

Diagnostic Fee Line

Refrigerant by the Pound

Warranty Terms

What HVAC Pros Bill For

Residential Service & Repair

New Equipment Installs

Commercial Maintenance Contracts

Emergency After-Hours Calls

HVAC Invoicing FAQ