A THOUGHTFUL HOME STARTS WITH A PLAN

Compare HVAC quotes: equipment, installation and total cost

Compare written HVAC bids side by side. Check indoor and outdoor equipment, ductwork, installation checks, warranties and payment totals before you choose.

Reviewed 2026-10-14How we review Suggest a correction

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Start here

Start by checking what each contractor will replace. A proposal for an outdoor unit and indoor coil is not the same scope as a proposal that also replaces the furnace. Match the work before comparing the difference in price.

Use the comparison worksheet ↓Need quotes first? Prepare your request ↓

Put the scope side by side

An example of two proposals that need clarification
Compare	Proposal A says	Proposal B says	What to confirm
Equipment	Outdoor unit and indoor coil	Outdoor unit, coil and furnace	Is the existing furnace staying? Ask both contractors to price the same components or explain why their recommended scope differs.
System sizing	Same size as the old unit	Load calculation included	What calculation supports the selected capacity, and how will current comfort problems be addressed?
Duct and electrical work	As needed	Listed work with exclusions	Which repairs and electrical changes are priced? Ask for a written change-order process for anything else.
Completion checks	Startup included	Written test results provided	What will be tested, which results will I receive, and who addresses a failed check?
Warranty service	Manufacturer warranty	Product and labor terms attached	Who pays for labor, diagnostics and return visits? Confirm duration, exclusions and registration responsibilities.

ILLUSTRATIVE EXAMPLE · NOT MARKET PRICES

A $1,500 difference can become a $600 difference

Illustrative arithmetic only: Proposal A is $11,200 with $900 of confirmed work outside that price. Proposal B is $12,700 with no confirmed additional charges. These are invented figures, not local prices or a completed project.

A: $11,200 + $900 = $12,100. B: $12,700 + $0 = $12,700. Difference: $600.

The known totals still do not tell you which installation is better. If A keeps an older furnace and B replaces it, ask for comparable scope before treating the $600 as a meaningful price comparison.

GET COMPARABLE QUOTES

Get HVAC proposals on the same basis

Replace the bracketed details, then use the same request with each company you are considering. Keep their written answers beside the quote.

Read the request before copying

I am comparing HVAC proposals for [equipment or problem] with a preferred timeline of [timing]. My current comfort concerns are [rooms or symptoms; not sure is fine].
Please evaluate the home and provide:
1. A base installed cash price, with optional alternatives priced separately.
2. Exact indoor/outdoor models, retained components, sizing basis and compatibility explanation.
3. Included duct, electrical, controls, permit and removal work; identify exclusions and unknown charges.
4. Completion checks and the records I will receive.
5. Product and labor warranty terms, service responsibility, payment schedule and quote expiration.
Please explain any recommendation that changes my requested scope and the approval process for extra work.
Please identify the load calculation used and any changes since it was prepared. Specify recorded startup measurements and the exact scope of any installation certificate included.

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Now compare your own quotes

Open the comparison worksheetEnter the quotes you have. Keep unanswered items as questions for your provider.

Compare two or three written proposals. Keep a working copy while you request another quote, or use the worksheet without saving.

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Quote AQuote A total price ($)Use the cash project price before any financing charges.Quote A extras outside that total ($)Enter 0 only when no additional known charges apply. Include tax or fees here only if outside the quoted total.

Check what is included in quote A

Exact equipment models and included components — ASizing calculation and equipment selection — ADuctwork and electrical scope — APermits, removal and cleanup — AInstallation checks and warranty terms — A

Compare a payment plan for quote A

Quote BQuote B total price ($)Use the cash project price before any financing charges.Quote B extras outside that total ($)Enter 0 only when no additional known charges apply. Include tax or fees here only if outside the quoted total.

Check what is included in quote B

Exact equipment models and included components — BSizing calculation and equipment selection — BDuctwork and electrical scope — BPermits, removal and cleanup — BInstallation checks and warranty terms — B

Compare a payment plan for quote B

I have checked that all quotes cover comparable products, quantities and work.

Leave unchecked when equipment, materials, measurements or scope differ.

Questions to take to your provider

Please list the model numbers and every indoor and outdoor component in your price.
Which duct, electrical, permit and removal work is included, and how are changes approved?
Can I have the cash price and the full payment schedule for the same scope?

Use these with the companies you are already considering. Ask for written answers so you can compare the same work or coverage.

Questions covered in this guide

How do you get HVAC quotes you can actually compare?

Ask each contractor to price the same starting request, then list recommended alternatives separately. Describe the equipment you have, the rooms that are uncomfortable and what you want fixed. Let the home evaluation determine the proposed design. ENERGY STAR’s hiring guidance calls for an evaluation and itemized proposals. A phone price based only on the old unit’s size leaves design and installation questions unanswered.

What sizing evidence should the installer show you?

In a January 2026 ACCA article, technical-services director Wes Davis explains that an existing load calculation may be reused under ACCA’s quality-installation standard when the home and duct system have not changed. That is a documented starting point. Ask for the calculation being used, its date, and whether renovations, windows, insulation or ducts have changed since then. Also request recorded startup measurements for airflow and refrigerant charge where applicable. A proposed equipment size and a completed installation check answer different questions.

What does a quality-installation certificate actually cover?

ACCA distinguishes contractor accreditation from certificates for individual installations. Its Verified Equipment Operation certificate addresses equipment operation; Verified System Performance also includes the connected distribution system. If a proposal advertises certification, ask which program and level it includes, who verifies it, and whether you will receive the job-specific record. Put that answer beside the promised ductwork and completion checks. This helps you compare the documented scope without assuming every certification label covers the same work.

Why can two HVAC bids be thousands of dollars apart?

Read the component list before the price gap. One bid may keep the furnace while another replaces it. One may include a duct repair, electrical change or control that the other excludes. Work through the difference in this order:

Match the indoor and outdoor components, exact models and proposed capacity.
Identify equipment that stays and ask how compatibility was checked.
Separate required installation work from optional upgrades.
Mark each unpriced item as unresolved and request a written amount or approval process.

Then compare the known totals. A larger price by itself does not establish better workmanship; a smaller price does not establish equal scope.

What does a complete installation proposal need to explain?

Ask what will be removed, installed, connected and checked at completion. “Standard installation” is too ambiguous to resolve a disagreement later. Have the contractor identify duct and electrical work, access requirements, permit responsibility where applicable, disposal and the records you will receive. If the only ductwork description is “as needed,” use the ductwork questions to establish locations, work and exclusions.

How do you compare warranty and payment terms?

Request the product warranty and the installer’s labor or workmanship terms separately. Ask who handles a service call, what charges could remain and who completes required registration. For payment, compare the cash price first and keep each financing schedule attached to the same scope. A smaller monthly amount does not establish a smaller total. Do not combine a down payment with an advertised financed balance until the provider explains which amounts are already included.

When is a quote ready for a decision?

You should be able to explain what each company is selling and which uncertainties remain. In the example above, adding $900 of confirmed excluded work reduces the apparent gap from $1,500 to $600, but a retained furnace still prevents an equal-scope comparison. Ask for a revised base option or a written explanation of that difference. The FTC’s contractor advice supports asking why written estimates differ. Use the contractor comparison worksheet to keep the answers beside the prices.

Putting it into practice

Resolve a quoted price gap in order: retained components, required work, unknown charges, warranty obligations and payment terms. A comparable base scope plus separately priced alternatives preserves the reason a contractor recommends different work.

Sources and supported claims

Equipment selection should follow a load calculation that considers the home, rather than using only its floor area.
Source ↗ · national · Checked 2026-10-12

ENERGY STAR recommends evaluating the home and comparing written, itemized proposals for equipment, cost and warranties.
Source ↗ · national · Checked 2026-10-13

The FTC recommends written estimates and an explanation of price differences instead of automatically choosing the lowest bid.
Source ↗ · national · Checked 2026-10-13

Wes Davis’s ACCA article describes reuse of an existing load calculation when the dwelling and ducts are unchanged, plus installation measurement and documentation.
Source ↗ · national · Checked 2026-10-13

ACCA distinguishes contractor QA accreditation, equipment-operation certificates and whole-system performance certificates.
Source ↗ · national · Checked 2026-10-13

More help with this decision

Sources & scope

U.S. Department of Energy: Proper sizing of HVAC systems ↗
Load calculation and equipment sizing · Checked 2026-10-12