HVAC service call checklist

On arrival

• Confirm the customer, address, and reported issue
• Note the equipment: make, model, serial, age, location
• Photograph the unit and the nameplate before work
• Ask about symptoms, history, and any prior repairs

Diagnostic

• Check thermostat operation and settings
• Inspect filter, coils, drain line, and electrical connections
• Measure temperature split, refrigerant pressures, and amp draw
• Identify the root cause, not just the symptom
• Document findings with photos and readings

Before doing the work

Present the repair option(s) with clear pricing and get the customer's approval before you start. Capturing that approval on-site — with a signature — protects you from disputes and is the moment to offer a maintenance plan. Never silently add work to the invoice.

After the work

• Test the system through a full cycle and record final readings
• Take after photos
• Walk the customer through what you did and why
• Note recommended follow-up work or a maintenance reminder
• Invoice the same day and request a review once paid

Why the checklist pays off

Documented service calls mean fewer callbacks, faster invoicing, stronger upsells, and proof if a customer ever questions the work. Equipment history attached to the customer record turns every future visit into a faster, more profitable one.