FHC Digital System
Free HVAC calculators with the working shown: AC and furnace sizing, duct size, CFM, SEER2 savings, running cost and dew point. Sourced and tested.
Added 11 Nov 2026
Analysed 11 Nov 2026
via 
What we found
- DMARC only monitors (p=none), so email spoofing this domain is still delivered.
- Built with Next.js and React, the site is hosted on Hostinger, with a domain registered 2 weeks before launch.
- It welcomes AI crawlers and publishes an llms.txt.
Built with: 13 technologies
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For light pages
<a href="https://firstsited.com/launch/j7r9vvfn/fhc-digital-system"><img src="https://firstsited.com/badge/j7r9vvfn/stack.svg" alt="FHC Digital System tech stack on FirstSited" height="28"></a>
For dark pages
<a href="https://firstsited.com/launch/j7r9vvfn/fhc-digital-system"><img src="https://firstsited.com/badge/j7r9vvfn/stack.svg?theme=dark" alt="FHC Digital System tech stack on FirstSited" height="28"></a>
How it fits together
Each technology runs on, or extends, the one it sits under.
| Technology | Type |
|---|---|
| Infrastructure | |
Hostinger DNS
|
DNS |
Hostinger
(2)
|
Hosting |
| HTTP/3 | Protocol |
| HSTS | Security |
Hostinger Email
|
Business email |
| Build & Framework | |
Tailwind CSS
|
CSS framework |
React
(2)
|
Framework |
Next.js
(5)
|
Meta-framework |
Lucide Icons
|
UI library |
| Analytics & Marketing | |
Google AdSense
(2)
|
Advertising |
Google Analytics
(4)
|
Analytics |
Google
|
Consent |
Google Tag Manager
(3)
|
Tag management |
Each technology links to its own page: which other new sites launched with it.
Site checks
| Custom title and meta description | |
| Open Graph tags (title, image, description) | |
| Twitter card meta tags | |
| Canonical URL declared | |
| Responsive viewport meta tag | |
| Favicon present | |
| Semantic HTML (nav, main, article) | |
| Page title is 61 characters Google only shows about 60 characters of the title in search results; aim for 50–60 to keep the whole thing visible. |
| Referrer-Policy | |
| X-Frame-Options | |
| Permissions-Policy experimental | |
| X-Content-Type-Options | |
| Content-Security-Policy | |
| Strict-Transport-Security | |
| X-XSS-Protection deprecated, not counted |
| Privacy policy /privacy/ | |
| Terms of service /terms/ | |
| Consent manager Google |
Mentions: GDPR, CCPA, Cookies, Do Not Sell
| robots.txt | |
| sitemap.xml 4 URLs | |
| security.txt optional | |
| llms.txt | |
| ads.txt | |
| humans.txt optional |
| llms.txt published | |
| 1 AI bot blocked in robots.txt the owner's choice | |
| Content-Signal none declared | |
| Link headers none advertised |
| State | Record | Status |
|---|---|---|
| SPF ~all | Soft-fail (~all), common and accepted | |
| DMARC p=none | Monitoring only (p=none) | |
| DKIM | Not found at common selectors | |
| MTA-STS | Not deployed | |
| TLS-RPT | Not configured |
Hosting and network
| Network | AS-HOSTINGER - Hostinger International Limited, CY AS47583, DE |
|---|---|
| DNS | Hostinger DNS authoritative nameservers |
| DNSSEC | Not enabled DNS answers are unsigned |
| Certificate | Let's Encrypt valid 22 Oct 2026 to 20 Jan 2027, as captured |
| Domain age | 20 days registered Oct 2026, HOSTINGER operations, UAB |
| Green hosting | Yes per The Green Web Foundation |
| Page build | 20 JS files, 0 CSS files 4 third-party domains, code splitting |
| App manifest | Free HVAC Calculators display standalone; 5 icons; utilities, productivity, education |
| Brand colours |
Storage: 1 item
| Name | Lifetime | Set by |
|---|---|---|
| FCCDCF | 1y | - |
Performance
| Measure | This site | Reading |
|---|---|---|
| Server response | 173 ms | good, faster than 67% of sites |
| Largest contentful paint | 892 ms | good |
| Layout shift | 0.03 | good |
| Page weight | 1.5 MB | fair |
| Third-party domains | 4 | |
| Console errors | 0 | none |
| Failed requests | 0 | none |
From a single automated render of the home page. A quick guide, not a substitute for Lighthouse or field data. How we measure
Notes
-
Looks AI-built: few AI signals.
How much the site looks AI-generated. It is a pattern match shown for interest, not a verdict.
Which signals fired
Signal Points AI writing signals +5 - Performance comes from one render on 11 November 2026 and will vary between visits.
How we know
FirstSited records what new websites are built with, usually within a day of going live. Most we find ourselves, by watching public internet infrastructure for brand-new sites; the rest come from Product Hunt, Hacker News and PeerPush. We checked this one in full: its tech stack, DNS, security headers and page basics. This page is what we saw on 11 November 2026; the live site may have changed since.
Every technology below links to its own page: which other new sites launched with it. Watch any of them and get every new site that uses it as it goes live, from £15 a month.