Compare the job before comparing the price. Put each proposal into the same scope worksheet, mark unknown items, and ask contractors to resolve the differences in writing. A lower total cannot establish better value when the indoor equipment, duct work, startup checks or labor coverage differ.
Have two written proposals? Compare them with the free two-quote tool. Enter the documented scope and listed totals, then print or download the differences and questions. No quote is uploaded; saving is optional and stays on your device.
Put the quotes on one page
Start with a blank comparison, rather than ranking the totals. ENERGY STAR’s contractor guidance recommends written, itemized proposals and comparing efficiency and warranty alongside cost. This worksheet turns that advice into a practical review process. It is an editorial tool, not a contractor score or a pricing formula.
| Write down for each quote | Evidence to request | If missing, mark it |
|---|---|---|
| Outdoor and indoor equipment | Model numbers and retained components | Equipment unresolved |
| Cooling capacity and efficiency | Sizing explanation and rated combination | Performance unresolved |
| Duct and connection work | Named areas, tasks and exclusions | Installation unresolved |
| Variable work or allowances | Included amount, trigger and approval process | Final cost unresolved |
| Startup and handover | Checks performed and records supplied | Completion unresolved |
| Equipment and labor protection | Separate written terms | Coverage unresolved |
Use the same headings for every contractor. Preserve the original documents so the worksheet does not accidentally replace a qualification in the actual proposal.
Separate included, excluded and unknown
Give every item one of four labels: included, excluded, conditional or not stated. These labels answer different questions. An electrical allowance is conditional; a blank electrical row is not stated. Neither is a confirmed final price for electrical work.
Ask each contractor to explain what would turn a conditional item into extra work. For example: who inspects the existing connection, when that assessment happens, how additional work is priced, and how you approve it before it proceeds. Request an amended scope when an answer changes the proposal.
Keep financing separate from the installation total. Record the cash price, any financed price and the payment terms being offered. A monthly payment alone does not describe the same purchase. Do not subtract a potential rebate from every proposal unless the specific program, equipment and application conditions have been checked.
Ask for evidence behind the equipment
An outdoor model name alone does not describe a split system’s rated combination. AHRI explains equipment matching and how a reference number or certificate identifies certified indoor and outdoor combinations. Ask what combination the quoted efficiency refers to. A certificate documents rated equipment performance; it does not inspect the installation in your home.
For installation, ask what will actually be checked. ENERGY STAR’s quality-installation guidance covers sizing, airflow, refrigerant charge and ducts. Record the contractor’s proposed work and handover documents beside those topics. “Professional installation included” leaves more uncertainty than a description of the planned checks.
If two contractors select different capacities, ask them to explain their load assumptions. If they disagree about retaining a coil or furnace, ask for the finding behind each recommendation. A factual disagreement needs an explanation before a price negotiation.
Worked example: two different jobs
Hypothetical example; these are invented scopes, not customer bids or market data. A homeowner receives Proposal A for a new outdoor unit with the existing indoor coil retained. Proposal B includes a new outdoor unit and coil, sealing two identified duct sections and a separate labor warranty.
The useful next step is not to declare B expensive. The homeowner asks A to document the retained coil combination and clarify duct assessment and labor terms. They ask B what inspection supports replacing the coil and sealing those sections.
Suppose A responds that indoor compatibility has not yet been checked. The comparison now has a concrete unresolved item. Suppose B explains the duct work but leaves access repairs excluded. That exclusion belongs on the worksheet too. Either proposal can change after clarification; neither total was sufficient to choose a contractor.
Use our quote checklist to save the questions, and read outdoor unit versus full-system replacement when replacement scope is the central disagreement.
Make the final proposal checkable
Before accepting, ask for one final document that incorporates agreed clarifications. Check models, scope, exclusions, allowances, payment stages, scheduling assumptions, required-permit responsibility and separate warranty terms. Agree how a model substitution or newly discovered task will be communicated and approved.
Also agree what you receive at handover: equipment identification, operating instructions, applicable registration information, startup records and a contact for follow-up. Keep copies with the final invoice. The aim is a job you can describe and check, rather than the largest stack of paperwork.
For national price context, use the AC replacement cost guide. Its published manufacturer examples cannot determine whether either local proposal has a reasonable margin.
Questions homeowners ask
Should I always choose the middle quote?
No. Position in a price ranking says nothing about scope, diagnosis or installation. First resolve the material differences, then decide which documented proposal best addresses the home and your priorities.
What if a contractor will not break out every dollar?
A package price can still have a clear scope. Ask what is included, what could change and how completion is verified. A missing equipment-versus-labor price split is different from an unexplained installation obligation.
Is a quote much higher than an online range a red flag?
It is a reason to investigate scope and obtain a comparable assessment. Online ranges may omit indoor equipment or site work. The range alone cannot establish overcharging.
Sources & limitations
This is educational information for U.S. homeowners, not an equipment diagnosis, binding quote or professional design. We use public sources and explain our assumptions. Manufacturer prices describe their own examples, not every brand or local market. Read our full methodology.
- ENERGY STAR10 Tips for Hiring a Heating and Cooling Contractor ↗Accessed · contractor selection guidance · Publication date not stated
Supports checking applicable credentials, references, a home evaluation and written proposals. Does not establish local licensing rules or guarantee a contractor's quality. No savings claims copied.
- ENERGY STARHVAC Quality Installation ↗Accessed · installation guidance · Publication date not stated
Consumer guidance on appropriate sizing, airflow, refrigerant charge and duct assessment. Used for installation questions, not dollar estimates or a claim of professional inspection.
- Air-Conditioning, Heating, and Refrigeration Institute (AHRI)Air Conditioners and Heat Pumps ↗Accessed · equipment certification guidance · Publication date not stated
Supports identifying certified indoor/outdoor combinations by reference number or certificate. Not evidence of installed workmanship. Legacy minimum-SEER and other dated assertions elsewhere on the page are not used.
Content updates
These dates reflect substantive editorial changes, not automatic build timestamps.
- — Added the interactive two-quote comparison tool and linked the scope worksheet, hypothetical example, questions and export workflow.
Turn the reading into a plan.
Put published references in context and take better questions to a contractor.
Use the AC cost planner