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Furnace replacement
A furnace replacement estimate should make it possible to understand exactly what equipment is proposed, what work is included, what may cost extra, and which warranties apply. Compare the written scope as carefully as the total price: two estimates are not truly comparable if they describe different equipment or installation work.
Start with the equipment and how it was selected
The estimate should identify the proposed furnace by manufacturer, model number, fuel, capacity, and efficiency rating. If it lists only a brand or a general product tier, ask for the exact model and the performance details that matter to your home.
Ask how the contractor determined the furnace size. The existing unit's size can be useful history, but it does not by itself show that the same capacity is right for the house today. Ask whether the recommendation considered the home's size, insulation, windows, layout, and heating needs, and request an explanation if the new capacity differs substantially from the old one.
If you are weighing a furnace against another system, compare the assumptions behind each proposal. Our New York heat pump vs. furnace guide covers factors that may affect which options are worth discussing.
Line items to compare in writing
Not every home needs every modification below. A clear estimate should identify the contractor, service address, estimate date, and proposal validity period, then say what applies to your installation, what is included in the price, and what is excluded or conditional.
| Estimate item | What it should clarify | Question to ask |
|---|---|---|
| Equipment | Manufacturer, exact model, fuel, capacity, efficiency, and any included accessories or controls. | Are these the exact model numbers being quoted, and what alternatives are available? |
| Sizing basis | The method and home information used to select the proposed capacity. | How was the size determined, and how does it compare with the existing furnace? |
| Removal and disposal | Whether disconnecting, removing, and disposing of the old furnace are included. | Are there extra charges for difficult access or disposal? |
| Installation scope | Connections and transitions to existing ductwork, thermostat, filter rack, and other components, where needed. | Which existing parts will be reused, changed, or excluded? |
| Venting and combustion air | Any vent, chimney, intake, or combustion-air changes required by the selected furnace and local code. | Has the existing venting been checked for compatibility with this model? |
| Utilities and drainage | Any gas, electrical, condensate-drain, or other connection work that applies to the installation. | Are these tasks included, and who handles any required upgrades? |
| Permits and inspections | Whether permits or inspections are required in your municipality and who is responsible for arranging them. | Are permit fees included, or will they be billed separately? |
| Price and schedule | Itemized equipment and labor, applicable fees and taxes, total price, expected schedule, and payment terms. | What is the expected start and completion window, and how are changes to the scope approved? |
| Start-up and testing | What operational, safety, airflow, and combustion checks will be completed and documented, as applicable. | Will I receive a record of commissioning and test results? |
| Warranty and service | Manufacturer parts coverage, any heat-exchanger terms, labor coverage, registration requirements, and exclusions. | Who handles a warranty call, and what labor or service costs are not covered? |
Compare estimates on the same basis
Before choosing, line up each proposal and compare the model numbers, capacity, efficiency, included accessories, removal, venting, duct or utility changes, permit responsibility, testing, warranties, and payment terms. If a price is much lower, ask which work or equipment is omitted; if it is higher, ask what specific additional value or scope explains the difference.
- Request a written explanation of any allowances, exclusions, or work that will be priced only after installation begins.
- Confirm whether taxes, permit fees, disposal, and optional accessories are included in the total.
- Ask when the estimate expires and what could change the price after the site visit.
- Keep the proposed scope and warranty terms with the final contract so you can compare them later.
If the replacement discussion began after a heating failure, first review the safe checks for a furnace that is not heating. A troubleshooting visit and a replacement proposal are different scopes; ask what diagnosis supports the recommendation and whether repair remains an option.
Questions to ask before accepting a proposal
- What exact furnace model and capacity are included?
- How was the size selected for this home?
- What removal, duct, venting, electrical, gas, or drainage work is included or excluded?
- Who will handle required permits and inspections?
- What start-up and safety checks will be recorded at completion?
- Which parts and labor warranties apply, and what registration or maintenance conditions are attached?
- What circumstances could change the quoted price, and will added work need written approval first?
Look beyond the equipment price
A replacement is a system installation, not just a furnace purchase. A useful estimate lets you compare equipment, site-specific work, testing, permits, and warranty coverage together. Get unclear items answered in writing before you decide, and make sure the final contract matches the proposal you selected.
Frequently asked questions
Should every furnace replacement estimate include a load calculation?
Ask how the contractor determined the recommended capacity and what information was used. The estimate or supporting documentation should make the sizing rationale understandable for your home.
Are permits always included in the quoted price?
No. Requirements and fees can vary by location and project scope. The estimate should state who will check requirements, obtain permits if needed, and pay associated fees.
Is a longer equipment warranty the same as a labor warranty?
Not necessarily. Manufacturer parts coverage and contractor labor coverage may be separate, with different terms, registration steps, and exclusions. Ask for both in writing.
