Free HVAC & Climate Calculator Widgets
BTU and heating-load estimates, BTU/ton/kW conversion, airflow and air changes, duct sizing, dew point, heat index and wind chill widgets built on published engineering and weather-service formulas.
Try them live
Real hvac & climate widgets - exactly what your visitors would see.
The live example loads when it scrolls into view.
Who these are for
HVAC contractors, building-services engineers, home-improvement sites and weather publishers.
Common uses
- A BTU sizing estimate beside air-conditioner listings
- A heating-load or duct-size check in an HVAC course
- Heat index and wind chill on a local weather or outdoor-work safety page
How embedding works
Pick a widget, set the theme and size, copy one line of HTML and paste it into your page. It runs in its own frame, so it cannot clash with your site's styles, and it resizes itself if you use the loader.
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Room air conditioner size in BTU/h from floor area, sun, occupants and kitchen use, per ENERGY STAR.
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Simplified design heat loss in kW and BTU/h from size, insulation, windows, air leakage and temperatures.
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Convert cooling and heating capacity between BTU/h, tons of refrigeration, kW, kcal/h and horsepower.
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Room airflow in CFM, m³/h or L/s converted to air changes per hour, and back again.
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Round duct diameter and an equal-friction rectangular duct from airflow and design velocity.
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Dew point from air temperature and relative humidity, or humidity from a dew point, in °C or °F.
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The NWS 'feels like' heat index from temperature and humidity, with the official risk category.
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Wind chill temperature from air temperature and wind speed, with frostbite risk times.
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How to add a widget
Open a widget, choose the theme, width and style, check the live preview, then copy the code. Paste it into an HTML or "Custom code" block on your site - step-by-step instructions for each platform.