15degreescooler.com website review

20 images could be 2.2 MB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen. Google estimates it would make the page about 300 ms faster on a phone.

8 third-party services load with your homepage (Google Tag Manager, Google CDN and Bigcommerce and others), adding 5.0 MB and 1.1 s of main-thread time.

About 798 KiB of JavaScript is downloaded but never used on this page. Google estimates it would make the page about 600 ms faster on a phone.

Your mobile performance score is 58. Pages that score under 90 lose visitors before the first paint.

Bigcommerce costs a phone 221 ms of main-thread work and 3.5 MB of downloads while your page loads. Loading it after the page is usable, or only on the pages that need it, takes that off the critical path.

7 files block the first paint until they finish downloading. Deferring or inlining them could save about 550 ms.

About 59 KiB of CSS is downloaded but never applied on this page. Google estimates it would make the page about 450 ms faster on a phone.

Google Tag Manager costs a phone 266 ms of main-thread work and 706 KiB of downloads while your page loads. Loading it after the page is usable, or only on the pages that need it, takes that off the critical path.

Google CDN costs a phone 237 ms of main-thread work and 369 KiB of downloads while your page loads. Loading it after the page is usable, or only on the pages that need it, takes that off the critical path.

A phone's processor spends 2.5 s on main-thread work while loading, 1.4 s of it running JavaScript. Above 2 s, taps and scrolls feel sluggish.

The page has 1,715 HTML elements. Above 1,500, rendering and every interaction get slower on phones.

11 files are served with short cache lifetimes, so returning visitors download them again (242 KiB).

11 long tasks block the main thread while loading, the longest for 244 ms. During a long task the page ignores taps.

Polyfills for old browsers add 40 KiB JavaScript that modern phones do not need.

31 KiB JavaScript is shipped twice across bundles.

7 KiB could be saved by minifying JavaScript.

Critical files load one after another instead of in parallel (3 chains). Preconnecting to key origins and preloading the hero image shortens the chain.

Scripts make the browser recalculate the layout repeatedly while the page loads, which wastes processor time on phones.

Real Chrome users on phones do not pass Google's Core Web Vitals on this page (28-day field data from the Chrome UX Report (opens in a new tab)). Google uses this in ranking.

The page becomes fully interactive after 15.0 s. Good is under 3.8 s.

Your largest element takes 4.9 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the image.

For real visitors the layout shifts by 0.25 (75th percentile). Good is under 0.1.

Real visitors wait 937 ms for your server to start answering (75th percentile). Good is under 800 ms.

The layout shifts by 0.227 while loading, so content jumps under the reader's thumb. Good is under 0.1.

Scripts block taps and scrolling for 442 ms in total while the page loads. Good is under 200 ms.

4 images have no width and height attributes, so the layout jumps as each one loads.

Over the last 25 four-week periods to 2026-11-07, real Chrome visitors' tap response (inp) went from 71 ms to 74 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Over the last 25 four-week periods to 2026-11-07, real Chrome visitors' largest content (lcp) went from 1.9 s to 1.9 s at the 75th percentile (Chrome UX Report (opens in a new tab) history).

Your homepage downloads 5.1 MB in 80 requests on a phone: images 3.2 MB (27), scripts 1.7 MB (28) and stylesheets 74 KiB (6). Under 2 MB keeps phones on slow connections fast.

pergola_hero_banner__53737.jpg is on the first screen but marked loading="lazy", so the browser waits before fetching it and the page looks finished later. Load it eagerly (and give it fetchpriority="high" if it is the main image).

By the Sustainable Web Design model, a visit to your homepage emits about 1.44 g of CO₂e: 172.8 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.

Some list items are not inside a list.

10 text elements don't have enough contrast against the background to read easily, especially outdoors on a phone.

Some lists contain elements other than list items, which screen readers announce wrongly.

1 element hidden from screen readers can still receive keyboard focus.

1 frame has no title, so screen-reader users cannot tell what it contains.

1 tap target is too small or too close together to hit reliably with a finger.

All page content should be contained by landmarks: 18 elements on the page fail this check, rated moderate by axe-core.

The page has no <main> landmark, so screen-reader users cannot jump straight to the content.

Landmarks should have a unique role or role/label/title (i.e. accessible name) combination: 1 element on the page fails this check, rated moderate by axe-core.

16 visible links have no text or label, so screen readers cannot say where they go.

Headings skip levels (h2 → h5), which makes the page harder to scan with a screen reader.

Your title is only 17 characters: “15 Degrees Cooler”. Between 30 and 65 characters leaves room to say what you do and for whom.

No structured data (JSON-LD), so Google can't show rich results such as your logo, ratings or FAQs.

Your meta description is 199 characters; Google truncates after about 160, so the end of your pitch is cut.

No Open Graph image (also missing: og:title, og:description), so links shared on LinkedIn, Slack or Facebook show no preview picture.

No XML sitemap at https://15degreescooler.com/sitemap.xml, so Google discovers your pages only by following links.

19 links have no real href, so search engines can't follow them.

Your <h1> is empty.

No twitter:card tag. X falls back to Open Graph, which is incomplete here.

The homepage links to 87 pages on 15degreescooler.com and 2 external pages.

There is no Organization (or LocalBusiness) JSON-LD, so search engines and AI assistants have no machine-readable facts about who runs the site: its name, logo, profiles and contact details.

There is no https://15degreescooler.com/llms.txt, a short Markdown guide to your key pages for AI tools (llmstxt.org). It is optional and few AI tools read it yet, so treat it as a cheap extra.

https://15degreescooler.com/compare declares the homepage as its canonical URL, which tells Google it is a copy of the homepage and keeps it out of search results. A site-wide template setting usually causes this.

/ and https://15degreescooler.com/compare all use the title “15 Degrees Cooler”. Search engines can't tell which page to show for a search, so each competes with the others.

https://15degreescooler.com/resources has no meta description, so Google writes the search snippet from whatever text it finds.

https://15degreescooler.com/window-awnings/metal-window-awnings and https://15degreescooler.com/window-awnings/commercial-window-awnings use the same meta description. A description written for each page earns more clicks.

We fetched 15 pages linked from your homepage (of 24 found) and read each the way a search engine does.

1 error was logged to the browser console while the page loaded, for example “Failed to load resource: the server responded with a status of 404 ()”.

No testimonials, customer logos, ratings or customer counts on the homepage: nothing tells a new visitor that others already trust you.

No phone number or email link on the homepage, so ready-to-buy visitors have one fewer way to reach you.

No guarantee or risk reducer (money-back, free trial, no credit card) is mentioned, which is often what tips a hesitant visitor.

The homepage carries about 486 words of visible text.

Before a visitor clicks anything, the page loads Google Ads, Google Analytics, Google Tag Manager, Meta Pixel and Pinterest Tag (measured from a US location before any click). No consent tool was detected. Visitors from the EU, UK and several US states must be asked first.

Opening the homepage sets 17 cookies, 1 of them by other companies (measured from a US location before any click).

No known cookie consent tool loads with the page. Some sites build their own banner, and some only show one to visitors from the EU.

Loading the homepage contacts 20 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.