Question 1

How do I bill refrigerant on an invoice?

Accepted Answer

List it as its own line item with the refrigerant type (e.g. R-410A, R-32, R-22, R-290), quantity in lbs or kg, and price per unit — the same qty × rate pattern as any other part. Use the header's refrigerant field to record the type and quantity added for warranty and compliance purposes even if it's also itemized as a line.

Question 2

Do I have to put my EPA 608, F-Gas or ARC licence number on the invoice?

Accepted Answer

It depends on your market. In the US, EPA 608 certification is required to handle refrigerant, but showing the certification number on the invoice is best practice rather than a legal requirement. In Australia, showing your ARC Refrigerant Trading Authorisation (RTA) number on invoices, receipts and quotes is a statutory requirement under the Ozone Protection and SGG Management Regulations 1995. In the UK, F-gas company certification (commonly via REFCOM) and, for boiler work, Gas Safe registration are customarily shown on invoices. In France, the attestation de capacité fluides frigorigènes number is expected on invoice documentation.

Question 3

Is HVAC labour taxable in the US?

Accepted Answer

It depends on whether the job is a capital improvement or a repair. Installing a new HVAC system is usually a capital improvement — the contractor pays sales tax on materials and charges the customer no sales tax (for example, New York's Form ST-124 or New Jersey's Form ST-8). Repair and maintenance labour on A/C and refrigeration equipment, however, is commonly taxable — New Jersey and New York both tax it — and repair parts are typically taxable retail sales in most states. Check your state's rule and mark each line taxable or not accordingly.

Question 4

What VAT rate applies to a heat pump installation?

Accepted Answer

It varies widely and several rates are time-limited or conditional, so always check the current rate before invoicing: the UK has applied 0% VAT to qualifying installs under its energy-saving materials relief, France applies 5.5% to heat pumps as energy-renovation work, Belgium applies 6% to non-fossil heating components (with age-of-dwelling conditions), the Czech Republic applies 12% to supply-with-installation in residential buildings, Poland applies 8% within its social-housing programme, and Spain applies 10% only if materials stay under 40% of the taxable base.

Question 5

Should I waive the diagnostic fee if the customer approves the repair — and how do I show that?

Accepted Answer

Yes, this is common practice. Keep the diagnostic fee as its own line item, then add a discount equal to the fee (or a "diagnostic fee waived — repair approved" credit line) so the invoice clearly shows the fee was charged and then waived, rather than simply omitting it.

Question 6

How do I invoice a maintenance agreement or seasonal tune-up?

Accepted Answer

Even when the customer pays a flat annual or seasonal fee, itemize what was actually done at each visit — filter change, coil cleaning, refrigerant level check, capacitor test, thermostat calibration — so there's a clear service record even though the total charge doesn't change.

Question 7

What equipment details belong on an HVAC invoice?

Accepted Answer

Make, model and serial number of the unit serviced. This is the field every competitor template gets wrong or omits — it's what a customer or a future technician needs to register a manufacturer warranty claim or look up service history.

Question 8

Is the US heat-pump tax credit still available?

Accepted Answer

The federal §25C Energy Efficient Home Improvement Credit expired for property placed in service on or after 1 January 2026. It is not retroactive — if you installed qualifying equipment in 2025 or earlier, you can still claim the credit on that year's return. Income-qualified HEAR rebates and various state programs remain available; check current federal and state guidance rather than assuming the older credit still applies.

Question 9

When must I issue a reverse-charge invoice for HVAC work?

Accepted Answer

When billing another VAT-registered construction or building-services business (not the end customer) for installation or maintenance of climate-control systems, many markets require a 0%-VAT reverse-charge invoice — Italy's rule (art. 17 c.6 lett. a-ter DPR 633/72) is unusually broad and applies even outside subcontracting chains. The UK's CIS domestic reverse charge and Germany's §13b UStG cover similar ground. Invoices to the end-customer property owner are usually unaffected and carry normal VAT.

Question 10

How much deposit should I take on an HVAC installation, and how do I invoice the balance?

Accepted Answer

A 50% deposit on larger installs (e.g. a full system changeout) is a common convention. Record the deposit using the amount-paid/deposit field, and on the final invoice add a negative "less deposit received" line so only the remaining balance is due.

Question 11

Do I need to record the customer's sign-off that work was completed?

Accepted Answer

It's good practice, especially on installs where a warranty period starts from the completion date. If you don't have a dedicated signature field, note the customer's acknowledgement and the date in the notes field alongside the warranty terms.

Περιγραφή	Ποσότητα	Τιμή	Ποσό
Diagnostic / call-out fee	1	€0.00	€0.00
Labour — repair & testing	1.5	€0.00	€0.00
Refrigerant — recovery & recharge (type/qty in header)	1	€0.00	€0.00
Part — replacement component (new)	1	€0.00	€0.00
Filter replacement	1	€0.00	€0.00
Annual maintenance plan — seasonal tune-up visit	1	€0.00	€0.00
Old equipment disposal & refrigerant recovery fee	1	€0.00	€0.00
Less deposit received	1	€0.00	€0.00

Υποσύνολο	€0.00
ΦΠΑ (19%)	€0.00

Σύνολο	€0.00

HVAC Invoice Generator

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