A clean, lightweight tonnage calculator for HVAC blogs, contractor websites and real-estate pages. Your visitors size their AC without leaving your site; you paste two lines of HTML. No accounts, no API keys, no ads inside the widget — ever.
This is the exact widget your visitors will see — fully functional, with automatic US/India detection.
<iframe src="https://actonnagecalc.com/embed/" loading="lazy" title="AC Tonnage Calculator"\n style="width:100%;max-width:520px;height:560px;border:1px solid #d7e1ea;border-radius:12px"></iframe>\n<p style="font-size:12px">Calculator by <a href="https://actonnagecalc.com/">actonnagecalc.com</a></p>
Options: ?theme=dark for dark mode · ?market=in to default to Indian split-AC sizing · combine with &. The attribution line below the iframe is a plain brand-name link — keep it as-is, move it, or restyle it to match your site.
You already flag suspect equipment sizing in reports — embed the calculator on your services or resources page and let clients verify it themselves. It pairs naturally with our symptom diagnostic (short-cycling, cold-but-clammy, ice on lines) when you need plain-language explanations for report findings. Suggested description for your page:
Wondering if your home's AC is sized correctly? This free calculator estimates the cooling load from your square footage, climate and sun exposure — compare it against the tonnage coded in your unit's model number.
"What will this place cost to cool?" is a buyer question on every showing. Embed the widget on buyer-resource pages or alongside listings — visitors get an instant tonnage and running-cost picture without leaving your site. Indian realty and NRI-focused blogs: add ?market=in so the widget opens in split-AC mode with ₹ estimates. Suggested description:
Estimate the air-conditioning size and monthly cooling cost for any home before you buy — enter the square footage and climate to see the recommended AC tonnage in seconds.
HVAC content sites and contractor pages constantly need a sizing calculator, and building a good one — dual-market load model, purchasable-size snapping, borderline logic — is real work. Ours is already built, tested, and maintained, so we'd rather you use it than rebuild it. The widget runs entirely in your visitor's browser: no data ever reaches our servers, and we load no analytics or advertising inside it.
Fair-use terms: free for any site; don't present the calculator as your own engineering tool for paid sizing reports, don't wrap it in misleading UI, and remember its results are estimates — the same disclaimer that governs the full site applies to embedded use.
Yes — free for any website, commercial or personal, with no signup, API key, or usage limits. The widget carries no advertising and loads nothing besides its own assets.
We ask that you keep the small 'Calculator by actonnagecalc.com' credit — it's how the free widget stays free — but it isn't technically enforced. The credit uses our brand name as the link text, consistent with search-engine guidelines for embedded widgets.
Yes: append ?theme=dark for dark mode and/or ?market=in to default to Indian split-AC sizing (e.g. /embed/?theme=dark&market=in). Without parameters it auto-detects the visitor's region and uses a light theme.