---
title: New HVAC System Cost by Square Footage (2026)
description: A new HVAC system costs about $3 to $6 per square foot, so a 2,000 sq ft home typically pays $6,000 to $12,000. See costs for 1,000 to 3,000 sq ft homes.
image: https://www.nobleadminnetwork.com/hubfs/noble-blog/noble-hvac-cost-by-square-footage.jpeg
---

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# New HVAC System Cost by Square Footage (2026)

By Noble Team · October 12, 2026

Noble Admin Network | Published on: October 12, 2026 | Time to read: 7 min | Updated on: October 17, 2026

Short answer

According to HomeGuide, a new furnace and AC unit cost about $3 to $6 per square foot of home, installation included. That puts a 2,000 sq ft home at about $6,000 to $12,000, and This Old House puts the average for a 3.5-ton system in a 2,000 sq ft home at about $8,300. Square footage is only the starting point: the right system size comes from a load calculation, and new ductwork can add thousands.

Here's what each home size typically pays, how size turns into tons, and why two homes the same size can get very different quotes. Still deciding whether to fix your current system? Start with our guide to [HVAC repair vs. replacement cost](https://www.nobleadminnetwork.com/blog/hvac-replacement), then come back here to budget the new one.

#### Key Takeaways

- HomeGuide puts a new furnace and AC, installed, at about $3 to $6 per square foot of home.
- That's about $6,000 to $12,000 for a 2,000 sq ft home and $9,000 to $18,000 for a 3,000 sq ft home.
- The common sizing shortcut is one ton of cooling per 400 to 600 sq ft, but 40 Manual J load calculations published on ACCA's blog averaged 1,431 sq ft per ton.
- Ask for a Manual J load calculation. A system sized by square footage alone is often bigger, and pricier, than the home needs.
- Ductwork can move the price by thousands for the same size home: HomeGuide puts a change-out at $5,000 to $11,000 and a system with new ductwork at $7,000 to $16,000.

## Table of Contents

- [How much does a new HVAC system cost by square footage?](https://www.nobleadminnetwork.com/blog/hvac-cost-by-square-footage#by-home-size)
- [What size HVAC system does your home need?](https://www.nobleadminnetwork.com/blog/hvac-cost-by-square-footage#system-size)
- [What does each system size cost?](https://www.nobleadminnetwork.com/blog/hvac-cost-by-square-footage#by-tonnage)
- [Why do two homes the same size get different quotes?](https://www.nobleadminnetwork.com/blog/hvac-cost-by-square-footage#same-size)
- [How do you keep the cost down without undersizing?](https://www.nobleadminnetwork.com/blog/hvac-cost-by-square-footage#save)
- [How do you protect a new system once it's in?](https://www.nobleadminnetwork.com/blog/hvac-cost-by-square-footage#protect)
- [Questions & Answers](https://www.nobleadminnetwork.com/blog/hvac-cost-by-square-footage#questions-answers)

## How much does a new HVAC system cost by square footage?

![Chart of new HVAC system costs by home size at $3 to $6 per square foot: $3,000 to $6,000 for 1,000 square feet, $3,600 to $7,200 for 1,200, $4,800 to $9,600 for 1,600, $6,000 to $12,000 for 2,000, $7,500 to $15,000 for 2,500, and $9,000 to $18,000 for 3,000](https://www.nobleadminnetwork.com/hs-fs/hubfs/noble-blog/noble-12-hvac-cost-by-square-footage.jpeg?width=1456&height=720&name=noble-12-hvac-cost-by-square-footage.jpeg)

About $3 to $6 per square foot of home, for a new furnace, AC unit, and installation. Here's what that range looks like for common home sizes, next to the averages This Old House reports for each system size.

| Home size | HomeGuide range ($3 to $6 per sq ft) | This Old House average (system size) |
| --- | --- | --- |
| 1,000 sq ft | $3,000 to $6,000 | $8,138 (1.5 tons) |
| 1,200 sq ft | $3,600 to $7,200 | $8,241 (2 tons) |
| 1,600 sq ft | $4,800 to $9,600 | Not listed |
| 1,800 sq ft | Not listed | $8,344 (3 tons) |
| 2,000 sq ft | $6,000 to $12,000 | About $8,300 (3.5 tons) |
| 2,500 sq ft | $7,500 to $15,000 | $12,670 (4 tons) |
| 3,000 sq ft | $9,000 to $18,000 | About $17,100 (5 tons) |

The two sources measure different things. [HomeGuide's cost guide](https://homeguide.com/costs/hvac-cost) gives a per-square-foot range for replacing a furnace and AC unit, and puts the national average replacement at $8,000. [This Old House](https://www.thisoldhouse.com/heating-cooling/hvac-installation-cost) reports average installed costs by system size, and says standard-efficiency installations typically run $5,000 to $12,500, with larger homes and premium equipment going past $22,000. Our read on why its small-home figures sit above HomeGuide's range: a small system still needs most of the same labor and setup.

Use the range to set a budget, and the averages as a check on the quotes you get. If a quote for your home size lands well outside both, ask the contractor what's driving it.

## What size HVAC system does your home need?

![Chart comparing the square-footage sizing shortcut of 400 to 600 square feet per ton of cooling with 40 actual load calculations, which averaged 1,431 square feet per ton and ranged from 624 to 3,325](https://www.nobleadminnetwork.com/hs-fs/hubfs/noble-blog/noble-12-square-feet-per-ton.jpeg?width=1456&height=720&name=noble-12-square-feet-per-ton.jpeg)

The one a load calculation says, not the one square footage suggests. Square footage is the first number everyone reaches for, and it's the least reliable way to size a system.

Cooling capacity is measured in tons, and one ton is 12,000 BTUs. The common shortcut is one ton for every 400 to 600 square feet. In a post on [Manual J load calculations vs. rules of thumb](https://hvac-blog.acca.org/manual-j-load-calculations-vs-rules-thumb/), the Air Conditioning Contractors of America's blog shows 40 actual load calculations: they averaged 1,431 square feet per ton and ranged from 624 to 3,325. Its conclusion is blunt: you can't use square feet per ton to size an air conditioner.

Oversizing costs you twice: you pay more for the bigger unit, and it can run worse in your home. A Manual J load calculation sizes the system to your house, not just its floor area. Ask every contractor to do one and show you the result.

#### Example: Sizing a 2,000 Sq Ft Home by Rule of Thumb

At the shortcut's 500 square feet per ton, a 2,000 sq ft home gets a 4-ton system. At the 1,431 square feet per ton that the 40 load calculations on ACCA's blog averaged, a 2,000 sq ft home would need about 1.4 tons. That's the gap a Manual J load calculation closes, and it's why two honest quotes for the same house can name different sizes.

## What does each system size cost?

Once you know the size, the price per ton is the next check. [HomeGuide](https://homeguide.com/costs/hvac-cost) lists these installed costs for a central AC system alone, with no furnace:

| System size | BTUs | AC system cost installed |
| --- | --- | --- |
| 1.5 tons | 18,000 | $2,000 to $5,000 |
| 2 tons | 24,000 | $2,500 to $5,500 |
| 2.5 tons | 30,000 | $2,700 to $6,000 |
| 3 tons | 36,000 | $3,000 to $6,500 |
| 3.5 tons | 42,000 | $3,100 to $7,000 |
| 4 tons | 48,000 | $3,500 to $7,500 |
| 5 tons | 60,000 | $4,000 to $8,000 |

Notice how little a bigger unit adds. Going from 2 tons to 4 tons adds about $1,000 at the low end of the range and $2,000 at the high end, which is why an oversized system rarely looks expensive on a quote. The real cost of oversizing shows up later, in comfort and wear.

For homeowners

Get a lifetime warranty on your new system, with no separate charge for it.

Covered repairs on the major internal components of the system, labor included, for as long as you own your home. See what the Noble lifetime warranty covers.

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## Why do two homes the same size get different quotes?

![Chart of how the scope of work changes an HVAC quote for the same home: a change-out on existing ducts costs $5,000 to $11,000, a system with new ductwork $7,000 to $16,000, and a system with ductwork and add-ons $9,500 to $18,500](https://www.nobleadminnetwork.com/hs-fs/hubfs/noble-blog/noble-12-same-size-different-quote.jpeg?width=1456&height=720&name=noble-12-same-size-different-quote.jpeg)

Because the system is only part of the job. Ductwork, efficiency, access, and permits move the total, and they vary from house to house.

**Ductwork.** [HomeGuide](https://homeguide.com/costs/hvac-cost) puts a change-out, new equipment on the existing ducts, at $5,000 to $11,000, and a system with new ductwork at $7,000 to $16,000. Replacing ductwork alone runs $1,400 to $5,600. If your system is more than 15 years old, HomeGuide says the ducts usually need work too.

**Efficiency.** Compare the yearly energy savings against the extra price before you pay for the top tier.

**Labor and access.** HomeGuide puts installation labor at $1,000 to $3,000, at $75 to $150 an hour, and more for rooftops, tight crawl spaces, and attics.

**Permits and removal.** Permits for a replacement run $100 to $250, and removing the old equipment $100 to $200, by HomeGuide's figures. Many quotes include both, so ask.

The fuller list of costs that get left off early quotes is in our [repair vs. replacement guide](https://www.nobleadminnetwork.com/blog/hvac-replacement).

## How do you keep the cost down without undersizing?

Compare quotes on the same system size, and time the work if you can.

- **Get three quotes for the same size.** Ask each contractor for the tons and BTUs they're quoting, and the load calculation behind it. A cheaper quote for a smaller system isn't a cheaper version of the same job.
- **Replace the furnace and AC together.** HomeGuide says doing both at once minimizes installation costs and keeps the two matched.
- **Book in spring or fall,** when HVAC contractors aren't as busy.
- **Look up rebates by ZIP code.** The federal Energy Efficient Home Improvement Credit applies to equipment placed in service before the end of 2025, according to the [IRS](https://www.irs.gov/credits-deductions/energy-efficient-home-improvement-credit), so a system installed in 2026 doesn't qualify. [ENERGY STAR's rebate finder](https://www.energystar.gov/rebate-finder) lists the state and utility offers that still apply where you live.

#### Questions to Ask Before You Compare Quotes

- Did you do a Manual J load calculation for my home, and can I see it?
- What size system are you quoting, in tons and BTUs?
- Is this a change-out on my existing ducts, or does it include ductwork?
- Are permits and removal of the old equipment included?

## How do you protect a new system once it's in?

Ask what happens when something breaks in year 8, or year 18. A manufacturer's warranty usually covers parts for a set term, and labor is often on you.

Some HVAC retailers include a lifetime warranty with the system they install. A Noble lifetime warranty covers repairs to the major internal components of the system, labor included, for as long as you own your home and keep up a spring and a fall service every year, and it's A-rated insurance-backed. Read [what lifetime should mean in writing](https://www.nobleadminnetwork.com/blog/what-lifetime-warranty-means-hvac), and [how to choose an HVAC lifetime warranty](https://www.nobleadminnetwork.com/blog/hvac-lifetime-warranty-new-homeowners), before you sign anything.

For homeowners

## Find out whether a Noble retailer installs near you.

Enter your ZIP code to see whether a lifetime warranty can come with your next heating or cooling system, or read exactly what it covers first.

[Check my ZIP](https://www.nobleadminnetwork.com/warranty-check)[See what's covered](https://www.nobleadminnetwork.com/homeowners)

For HVAC retailers

## Apply for your territory and offer the Noble lifetime warranty.

Noble offers the warranty program to only one residential HVAC retailer per territory. A retailer that proves its volume in its first 90 days holds the territory exclusively from then on. Every warranty you sell comes with a required spring and fall service every year, which your shop is first in line to book, and every contract is A-rated insurance-backed. The application takes about two minutes.

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## Questions & Answers

**How much does a new HVAC system cost for a 2,000 sq ft house?**

About $6,000 to $12,000, at HomeGuide's $3 to $6 per square foot for a new furnace, AC unit, and installation. This Old House puts the average for a 3.5-ton system in a 2,000 sq ft home at about $8,300. New ductwork, high-efficiency equipment, or a hard install can push it higher.

**How much does a new HVAC system cost for a 1,500 sq ft house?**

At HomeGuide's $3 to $6 per square foot, about $4,500 to $9,000. HomeGuide lists $4,800 to $9,600 for a 1,600 sq ft home.

**How much does a new HVAC system cost for a 1,000 sq ft house?**

HomeGuide puts it at $3,000 to $6,000. This Old House lists an average of $8,138 for a 1.5-ton system in a 1,000 sq ft home. Get quotes before you settle on either number.

**What size AC do I need for 2,000 square feet?**

The shortcut says about 4 tons, at 500 square feet per ton, but square footage alone is unreliable. ACCA's blog shows 40 load calculations averaging 1,431 square feet per ton, which would put the same home near 1.4 tons. Ask for a Manual J load calculation.

**How much does ductwork add to a new HVAC system?**

HomeGuide puts a change-out on existing ducts at $5,000 to $11,000 and a system with new ductwork at $7,000 to $16,000. Replacing ductwork alone runs $1,400 to $5,600.

**Is there still a federal tax credit for a new HVAC system?**

Not for a system installed in 2026. The IRS says the Energy Efficient Home Improvement Credit applies to equipment placed in service before the end of 2025. Check ENERGY STAR's rebate finder for state and utility rebates.

## Noble Administration Network

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Reliable protection for a life of comfort.

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