Build an HVAC Bid That Explains the Whole Job

This guide is a practical review process for a residential replacement bid. Commercial plans, engineered work, and formal bid specifications need their own project requirements. The examples are illustrative and contain no Mar-Hy pricing or promise of savings.

Record the customer’s complaint and the conditions you observed: rooms that are uncomfortable, access restrictions, existing equipment identity, duct and controls information, and the work the customer expects. Include photos and a list of items still to be verified. “Replace existing system” does not tell an estimator whether the return, controls, electrical work, or equipment location will change.

Identify what supports the equipment selection. ENERGY STAR’s quality-installation guidance emphasizes sizing from the home’s actual characteristics and checking airflow and refrigerant charge. A replacement bid should explain how the contractor will address those aspects of the job. Avoid treating the old unit’s nominal tonnage as the entire selection process.

Keep a short open-items list: who will resolve each question, when it will be resolved, and whether it affects price or scheduling. If a condition cannot be confirmed during the visit, make that uncertainty visible in the proposal instead of silently assuming the easiest case.

For performance comparisons, identify the exact applicable equipment combination. The AHRI certified-products directory provides certified performance information. A rating from a different combination should not stand in for the proposed system, and a certified equipment rating is not a prediction of a particular home’s utility bill.

Use a consistent estimating worksheet for equipment, materials, labor, subcontracted work, permits or fees where applicable, and other costs included in your estimating method. Check the resulting job margin before presenting options. Keep overhead treatment consistent so two estimators do not calculate the same job differently.

Here is an arithmetic example using a hypothetical $10,000 job cost. A 25% markup gives a selling price of $12,500. The $2,500 difference is 20% of that selling price, so the gross margin is 20%, not 25%. A target gross margin of 25% would give $10,000 ÷ (1 − 0.25) = $13,333.33, rounded to cents.

This is a calculation example, not a recommended price or margin. Your cost definition, overhead, risk, taxes, and accounting treatment matter. Have the responsible person confirm the method and use the same definition in the estimate and the completed-job review.

A useful option explains what changes and why a customer might choose it. Keep the common work visible, then identify the equipment, control, comfort, or installation differences. Avoid presenting three prices with three broad adjectives and leaving the customer to guess what the extra money buys.

Equipment efficiency ratings help compare products, but a promised percentage reduction in a customer’s bill needs a defensible calculation. If you provide an estimate, record the existing system assumptions, proposed equipment, usage, utility rates, weather basis, and other inputs. Explain which portions of the bill are included and what could change the result.

If those inputs are unavailable, describe the certified equipment ratings and the installation scope. Leave out the invented savings percentage. The customer should be able to tell whether a number is a product rating, a modeled estimate, an illustrative example, or an actual measured result.

Have the estimator and installation lead review the accepted scope together. Confirm the equipment list, accessories, site photos, access plan, responsibilities assigned to other trades, and any customer decisions still open. Ask the lead to identify what would cause the crew to stop or call the office.

Keep quote validity, payment terms, change handling, warranty responsibilities, and scheduling conditions clear in the company’s approved proposal documents. Verify current product availability and lead time before committing to a date. An estimate or a website listing is not evidence that a specific unit has been allocated to the job.

ACCA’s quality standards provide a reference for installation and verification practices. Use the applicable standard and equipment instructions to define your completion evidence rather than creating a universal set of technical limits for every system.

After completion, compare estimated and actual labor, materials, subcontractor costs, and return visits using the same cost definitions. Sort differences by cause: missed scope, changed customer request, concealed condition, ordering error, productivity, or incorrect estimating allowance. A useful review produces one change to the survey, worksheet, or crew handoff.

Track both accepted and declined proposals, but do not treat acceptance alone as proof of a sound bid. A job can sell and still miss important costs. Likewise, a higher quoted price may reflect a more complete scope rather than an arbitrary premium.

Preparing the equipment list? Bring the model requirements, accessories, controls questions, quantities, and job timing to Mar-Hy. Confirm product details and availability for the proposed job before finalizing your customer commitment.