An HVAC installation quote needs to distinguish equipment, crew time and job-specific extras from shared business costs. This example shows the arithmetic for a defined installation scope; it does not assess technical sizing, compliance requirements or local market prices.
Define the scope before entering costs
Assume the site has been inspected and the agreed work can be completed in the planned visit. Record equipment specifications, access, removal work, electrical or subcontracted work and exclusions in the estimate. Price an unconfirmed extra separately rather than hiding it in a percentage.
The following fictional amounts exclude tax and financing. All labour figures are person-hours: two technicians working six hours each use 12 person-hours, not six.
| Included cost | Basis | Amount |
|---|---|---|
| Equipment | Supplier quote | 2,400 |
| Consumables | Estimated use | 180 |
| Delivery labour | 12 person-hours × 35 | 420 |
| Travel and disposal | Job allowance | 100 |
| Allocated overhead | 12 person-hours × 15 | 180 |
| Total | 3,280 |
The 35 labour cost includes relevant employer costs and excludes the overhead shown separately.
Calculate the quote
At a hypothetical 20% margin after the included costs and no selling-price commission:
Price = 3,280 ÷ (1 − 0.20) = 4,100
The retained amount is 820. It is a planning amount under the listed assumptions, not a market rate or guaranteed net profit.
The HVAC quote calculator separates delivery costs from allocated overhead. When entering the example, use 3,100 as the combined direct-cost amount across its direct-cost fields, 180 overhead, 20% margin and zero commission. Do not enter the total 3,280 as direct cost and then add overhead again.
Test an overrun
Suppose delivery requires four additional person-hours. Direct labour increases by 140. If overhead is reallocated on actual hours at 15 per hour, it also increases by 60. Revised included cost is 3,480.
With the price fixed at 4,100, the retained amount falls to 620 and the margin becomes 15.12%. If your job reports keep the original overhead allocation instead, the reported figure will differ; document that convention rather than comparing unlike reports.
Check the deposit separately
Suppose equipment and consumables must be paid before work starts: 2,580. A hypothetical 30% deposit on the 4,100 quote is 1,230, leaving an immediate 1,350 gap before labour or other payments.
The 30% is an example, not advice on a legally permitted deposit. Payment terms depend on the contract and local requirements. The important arithmetic is that a profitable quote can require upfront cash. Use the deposit-gap calculator and cash forecast to examine timing.
Close the loop after the job
Compare estimated and actual person-hours, equipment invoices, extra materials and disposal costs. Record what caused a variance and whether additional work was agreed. Use those records to revise the next estimate, not just its final price.
This example applies the cost-and-margin approach explained in the service pricing guide. It deliberately supplies no recommended HVAC margin: that would require evidence about a particular market and business.
About the examples and sources
The figures are hypothetical teaching examples created for AskToBot, not surveyed prices or recommended industry margins. The linked references explain the underlying concepts; they do not supply or endorse these example figures. The arithmetic is checked against the stated assumptions. This is AI-assisted educational content and has not been independently reviewed by an accountant. Read how we check calculations.
