Homeowners Ask AI How Much a New AC Costs. Most HVAC Websites Don't Have the Answer.

Home Services · 397 sites audited · March 22, 2026

63

AISO Score

43

AEO

94

SEO

71

Readability

52

Engagement

The State of HVAC Websites

It's July. The AC dies. A homeowner asks Google AI 'how much does it cost to replace an AC unit?' The AI scans HVAC websites for an answer. Almost none give one. We audited 397 HVAC websites across the United States. The average AISO score is 63/100. We scored each site across four dimensions: SEO, readability, engagement, and AI engine optimization.

The AISO score refers to a website's combined readiness for search engines and AI answer engines. HVAC companies earn solid marks on SEO (94/100) and engagement (52/100). But AI Engine Optimization sits at just 43/100.

That gap is a massive missed opportunity. Pricing questions dominate HVAC search. AI tries to answer them every day. But most HVAC sites just say 'call for a free estimate.' AI skips them and cites someone else.

Why This Matters for HVAC

AI Engine Optimization (AEO) is defined as how well a website's content can be read and cited by AI tools like ChatGPT, Google AI Overview, and Perplexity.

HVAC is a high-value industry. A single customer can be worth $30,000+ over their lifetime. And HVAC has extreme seasonal search spikes. When a furnace dies in January or an AC fails in July, homeowners need answers now.

More and more, they ask AI first. 'My AC is blowing warm air — what's wrong?' 'How much does furnace replacement cost in [city]?' The companies that give clear, direct answers win the call.

In HVAC, the first company to respond often gets the job. Being the AI-recommended answer is worth thousands per lead.

When a furnace dies in January, homeowners ask AI for help. The HVAC companies that provide clear pricing and troubleshooting answers win the call. The ones that say 'call for a free estimate' get skipped.

Key Findings

7%

Score Below 50

14%

No Schema Markup

13%

No Open Graph Tags

43/100

Avg AI Engine Score

Key Takeaways

Common Mistakes in HVAC Websites

  1. No pricing content — homeowners search 'AC replacement cost' and 'furnace repair cost' constantly. Most HVAC sites say 'call for a free estimate' instead of giving any range at all
  2. No seasonal content — missing pages for 'prepare your furnace for winter' and 'AC maintenance for summer' despite massive seasonal search spikes
  3. No troubleshooting guides — 'AC blowing warm air' and 'furnace not heating' are top searches. HVAC sites could answer these with guides that lead to service calls
  4. One generic service page — listing heating, cooling, and plumbing together instead of separate pages for AC repair, furnace install, duct cleaning, and heat pump services
  5. No equipment comparisons — homeowners search 'Carrier vs Trane' and 'heat pump vs furnace.' HVAC sites rarely publish this content

How to Improve Your HVAC Website

  1. Create a pricing guide page. Include ranges: 'AC replacement: $3,500-$7,500 based on size and efficiency.' This single page can capture thousands of high-intent searches each month
  2. Build seasonal landing pages. 'Fall Furnace Tune-Up in [City]' and 'Summer AC Maintenance' with FAQ schema. Target the seasonal spikes before they hit
  3. Write troubleshooting content. Create guides like 'Why Is My AC Blowing Warm Air? 7 Common Causes.' Add a clear call-to-action to schedule service for problems they can't fix themselves
  4. Add equipment comparison pages. 'Heat Pump vs Furnace: Which Is Right for [Region]?' with cost tables, efficiency ratings, and climate factors. Add FAQ schema with common buyer questions
  5. Add Service and LocalBusiness JSON-LD schema. Include service types, service area, hours (especially emergency hours), and payment methods accepted

Dimension Breakdown

AI Engine (AEO) (30%)
43
SEO (20%)
94
Readability (25%)
71
Engagement (25%)
52

Score Distribution

AISO Score Ranges

0-9
0
10-19
0
20-29
2
30-39
1
40-49
23
50-59
95
60-69
206
70-79
69
80-89
1
90-99
0

Grade Distribution

A
1 (0%)
B
69 (17%)
C
206 (52%)
D
95 (24%)
F
26 (7%)

Frequently Asked Questions

How do HVAC websites compare to other home service industries?

HVAC averages 63/100. That's on par with roofing and plumbing. The top home service performers are pest control and cleaning, both at 63/100. HVAC's SEO is strong. The gap is in AI readiness.

What is the biggest opportunity for HVAC companies in AI search?

Pricing content. 'How much does [HVAC service] cost' is among the most searched terms in the industry. AI tries to answer these questions every day. Almost no HVAC site gives pricing ranges. The first companies to publish honest pricing guides will dominate AI citations.

Does seasonal content really help HVAC websites?

Yes. HVAC search volume spikes 300-400% during extreme weather. 'AC not working' surges in June through August. 'Furnace repair' spikes November through February. Having content ready before these spikes means AI already has your answers when homeowners need them most.

What is the AISO score and how does it work?

The AISO score is defined as a weighted measure of four factors: AI Engine Optimization (30%), SEO (20%), Readability (25%), and Engagement (25%). It rates how well a website performs for both search engines and AI answer engines like ChatGPT.

What is AEO and why should HVAC companies care?

AEO refers to AI Engine Optimization — how well your content can be read and cited by tools like ChatGPT, Perplexity, and Google AI Overview. For HVAC, low AEO means AI can't recommend your company when homeowners ask about costs, repairs, or maintenance.

How quickly can an HVAC company improve its AI search readiness?

Start by creating one pricing guide page with FAQ schema. That can boost AEO by 15-20 points within weeks. Add 3-4 troubleshooting articles and seasonal pages. Within a month, you can move from below average to the top 25% of HVAC sites.

What content should an HVAC website have for AI search?

At minimum: a pricing guide with cost ranges, seasonal maintenance pages, troubleshooting guides for common problems, equipment comparison pages, and FAQ schema on every service page. Each page should answer one clear question homeowners ask.

Should HVAC companies publish exact pricing on their website?

Ranges work better than exact prices. '$3,500-$7,500 for AC replacement depending on size' is honest and helpful. It answers the question AI is trying to answer while still leaving room for custom quotes. Saying nothing at all means AI cites someone else.

All 397 Audited Sites

Domains are partially blurred. Scores range from 0 to 100.

#DomainAISOGradeAEOSEORead.Eng.
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222admo*****.com62C40957151
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248rmcl*****.com61C40848742
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261call******.com60C401006446
262centralh**************.com60C28948447
263wicke*********.com60C52976237
264bree******.com60C30958742
265loca*****.abm.com60C381006845
266newyor*********.com60C36759047
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268kirkw*******.com60C30997153
269doneri*********.com60C201008452
270con*****.com60C48954956
271hvac*******.org60C40808541
272texasco************.com60C30988640
273gotsh*******.com60C25988448
274hvac******.com60C35908344
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372chapm*********.com49F52952435
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385kbco******.com45F30971055
386gobl******.com45F27735337
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Methodology

Each website was scored using AISO Studio's production scoring engine across four dimensions:

397 sites collected across US states using geographic search queries. Scores reflect the state of each website at time of audit.

How Does YOUR HVAC Website Score?

The average hvac website scores 63/100. Get a free audit to see where you stand and how to improve your AI search readiness.

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Homeowners Ask AI How Much a New AC Costs. Most HVAC Websites Don't Have the Answer. | AISO Studio