Free HVAC Technician Invoice Template & Generator

Your invoice needs the exact equipment you worked on, including make and model numbers. Write down every part you replaced with its part number and price. Break out labor hours separately from materials. Accountants will call you back if you just write "AC repair" because they need documentation for warranty claims and tax records. Include the service address if it's different from the billing address, which happens all the time with property managers.

Most HVAC work gets billed net 30 for commercial clients, but you can ask for payment on completion for residential jobs. Emergency calls and after-hours work should be paid immediately. For big installations, take a deposit that covers your material costs upfront, then bill the rest when you finish. This protects you if the client backs out halfway through.

Take photos of the equipment before and after you work on it. When a client disputes a charge three weeks later, you can show them exactly what was broken and what you fixed. This cuts down arguments about whether the work was actually necessary. Also, send invoices the same day you complete the job, not at the end of the week. People forget what you did surprisingly fast.