Heating and Cooling Invoice Template in Classic Corporate Style

Print-ready invoice template for heating and cooling invoice template (legal). Style: classic corporate, monochrome elegant palette, watermark mark accent. Top header with placeholder logo + company name + invoice number + date. Middle: table with columns for description, quantity, rate, amount + sample line items. Bottom: subtotal / tax / total + placeholder bank details and VAT number. A4 portrait, no watermarks. Placeholder financial / banking text only — no real IBAN, BIC, account numbers. Clean grid alignment, accurate column math in sample data. Target search intent (rendered visually, no on-image text): "heating and cooling invoice template" (en).