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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>idfkit — Modern Building Energy Simulation Toolkit</title>
<meta name="description" content="A fast, modern Python toolkit for EnergyPlus building energy simulation. O(1) lookups, automatic reference tracking, 3D visualization, and AI integration.">
<meta name="theme-color" content="#0a0e1a">
<meta name="keywords" content="EnergyPlus, IDF, epJSON, building energy simulation, Python, idfkit, energy modeling, HVAC, building performance">
<link rel="canonical" href="https://idfkit.com/">
<!-- Open Graph -->
<meta property="og:title" content="idfkit — Modern Building Energy Simulation Toolkit">
<meta property="og:description" content="Fast, modern tools for EnergyPlus building energy simulation. From Python library to web editor to AI integration.">
<meta property="og:type" content="website">
<meta property="og:url" content="https://idfkit.com/">
<meta property="og:image" content="https://idfkit.com/og-image.png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:locale" content="en_US">
<meta property="og:site_name" content="idfkit">
<!-- Twitter Card -->
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="idfkit — Modern Building Energy Simulation Toolkit">
<meta name="twitter:description" content="Fast, modern tools for EnergyPlus building energy simulation. From Python library to web editor to AI integration.">
<meta name="twitter:image" content="https://idfkit.com/og-image.png">
<!-- JSON-LD Structured Data -->
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@graph": [
{
"@type": "WebSite",
"name": "idfkit",
"url": "https://idfkit.com/",
"description": "A fast, modern Python toolkit for EnergyPlus building energy simulation. O(1) lookups, automatic reference tracking, 3D visualization, and AI integration."
},
{
"@type": "SoftwareSourceCode",
"name": "idfkit",
"description": "A fast, modern Python toolkit for EnergyPlus with O(1) lookups, automatic reference tracking, and zero dependencies.",
"url": "https://github.com/idfkit/idfkit",
"codeRepository": "https://github.com/idfkit/idfkit",
"programmingLanguage": "Python",
"license": "https://opensource.org/licenses/MIT",
"runtimePlatform": "Python 3.10+",
"applicationCategory": "Building Energy Simulation",
"author": {
"@type": "Person",
"name": "Samuel Letellier-Duchesne",
"url": "https://samuelduchesne.github.io"
}
},
{
"@type": "WebApplication",
"name": "Envelop",
"url": "https://app.idfkit.com/",
"description": "A modern, browser-native EnergyPlus editor with visual HVAC design, 3D geometry, and in-browser simulation.",
"applicationCategory": "EngineeringApplication",
"operatingSystem": "Any (Web Browser)",
"offers": {
"@type": "Offer",
"price": "0",
"priceCurrency": "USD"
}
}
]
}
</script>
<!-- Fonts -->
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap" rel="stylesheet">
<!-- Styles -->
<link rel="stylesheet" href="css/style.css">
<!-- Favicon -->
<link rel="icon" type="image/svg+xml" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>⚡</text></svg>">
</head>
<body>
<!-- Beta Announcement Bar -->
<div class="beta-bar">
<div class="beta-bar-inner">
<span class="beta-bar-badge">Beta</span>
<span class="beta-bar-text">These tools are in active development. Try them out and <a href="#beta-feedback">share your feedback</a>.</span>
</div>
</div>
<!-- Navigation -->
<nav class="nav" id="nav">
<div class="nav-inner">
<a href="#" class="nav-logo">
<span class="nav-logo-icon">⚡</span>
<span class="nav-logo-text">idfkit</span>
</a>
<div class="nav-links">
<a href="#ecosystem" class="nav-link">Ecosystem</a>
<a href="#features" class="nav-link">Features</a>
<a href="#get-started" class="nav-link">Get Started</a>
<a href="https://github.com/idfkit" class="nav-link nav-link-github" target="_blank" rel="noopener" aria-label="idfkit on GitHub">
<svg width="20" height="20" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true"><path d="M12 0c-6.626 0-12 5.373-12 12 0 5.302 3.438 9.8 8.207 11.387.599.111.793-.261.793-.577v-2.234c-3.338.726-4.033-1.416-4.033-1.416-.546-1.387-1.333-1.756-1.333-1.756-1.089-.745.083-.729.083-.729 1.205.084 1.839 1.237 1.839 1.237 1.07 1.834 2.807 1.304 3.492.997.107-.775.418-1.305.762-1.604-2.665-.305-5.467-1.334-5.467-5.931 0-1.311.469-2.381 1.236-3.221-.124-.303-.535-1.524.117-3.176 0 0 1.008-.322 3.301 1.23.957-.266 1.983-.399 3.003-.404 1.02.005 2.047.138 3.006.404 2.291-1.552 3.297-1.23 3.297-1.23.653 1.653.242 2.874.118 3.176.77.84 1.235 1.911 1.235 3.221 0 4.609-2.807 5.624-5.479 5.921.43.372.823 1.102.823 2.222v3.293c0 .319.192.694.801.576 4.765-1.589 8.199-6.086 8.199-11.386 0-6.627-5.373-12-12-12z"/></svg>
</a>
</div>
</div>
</nav>
<!-- Hero Section -->
<section class="hero" id="hero">
<canvas id="hero-canvas"></canvas>
<div class="hero-overlay"></div>
<div class="hero-content">
<div class="hero-badge">
<span class="hero-badge-dot"></span>
Open Source · MIT License
</div>
<h1 class="hero-title">
<span class="hero-title-line">Modern tools</span>
<span class="hero-title-line hero-title-gradient">for building</span>
<span class="hero-title-line hero-title-gradient">energy simulation</span>
</h1>
<p class="hero-subtitle">
A suite of open-source tools for EnergyPlus — from a Python library to a visual web editor to AI integration. Everything you need to model, simulate, and optimize building energy performance.
</p>
<div class="hero-actions">
<a href="#get-started" class="btn btn-primary">
Get Started
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M5 12h14M12 5l7 7-7 7"/></svg>
</a>
<a href="#ecosystem" class="btn btn-secondary">
Explore Ecosystem
</a>
</div>
<div class="hero-stats">
<div class="hero-stat">
<span class="hero-stat-value">4000x</span>
<span class="hero-stat-label">Faster lookups</span>
</div>
<div class="hero-stat-divider"></div>
<div class="hero-stat">
<span class="hero-stat-value">55k+</span>
<span class="hero-stat-label">Weather stations</span>
</div>
<div class="hero-stat-divider"></div>
<div class="hero-stat">
<span class="hero-stat-value">25</span>
<span class="hero-stat-label">AI tools via MCP</span>
</div>
</div>
</div>
<div class="hero-telemetry" id="hero-telemetry">
<div class="telemetry-row">
<span class="telemetry-label">Solar Alt</span>
<span class="telemetry-value" id="telem-solar-alt">42.3°</span>
</div>
<div class="telemetry-row">
<span class="telemetry-label">Azimuth</span>
<span class="telemetry-value" id="telem-azimuth">187.2°</span>
</div>
<div class="telemetry-row">
<span class="telemetry-label">Surf Temp</span>
<span class="telemetry-value" id="telem-surf-temp">24.7 °C</span>
</div>
<div class="telemetry-row">
<span class="telemetry-label">Wind</span>
<span class="telemetry-value" id="telem-wind">3.2 m/s</span>
</div>
<div class="telemetry-row">
<span class="telemetry-label">Heat Flux</span>
<span class="telemetry-value" id="telem-heat-flux">+12.4 W/m²</span>
</div>
<div class="telemetry-row">
<span class="telemetry-label">Envelope ΔT</span>
<span class="telemetry-value" id="telem-delta-t">6.8 K</span>
</div>
</div>
<div class="hero-scroll-indicator">
<div class="hero-scroll-line"></div>
</div>
</section>
<!-- Ecosystem Section -->
<section class="section section-ecosystem" id="ecosystem">
<div class="container">
<div class="section-header">
<span class="section-label">The Ecosystem</span>
<h2 class="section-title">One ecosystem.<br>One mission.</h2>
<p class="section-subtitle">From Python scripting to visual editing to AI-powered workflows — choose the tools that fit your needs.</p>
</div>
<div class="ecosystem-grid">
<!-- idfkit core -->
<div class="eco-card" data-animate>
<div class="eco-card-badge">Python</div>
<div class="eco-card-icon">
<svg width="32" height="32" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5"><path d="M12 2L2 7l10 5 10-5-10-5z"/><path d="M2 17l10 5 10-5"/><path d="M2 12l10 5 10-5"/></svg>
</div>
<div class="eco-card-label">Core Library</div>
<h3 class="eco-card-title">idfkit</h3>
<p class="eco-card-desc">A fast, modern Python toolkit for EnergyPlus with O(1) lookups, automatic reference tracking, and zero dependencies.</p>
<ul class="eco-card-features">
<li>O(1) dictionary-based object indexing</li>
<li>Live cross-object reference graph</li>
<li>IDF + epJSON dual format support</li>
<li>3D geometry & thermal calculations</li>
<li>Sync, async & batch simulation</li>
<li>EnergyPlus 8.9 through 25.2</li>
</ul>
<div class="eco-card-code">
<code>pip install idfkit</code>
</div>
<a href="https://github.com/idfkit/idfkit" class="eco-card-link" target="_blank" rel="noopener">
View on GitHub
<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M7 17L17 7M17 7H7M17 7v10"/></svg>
</a>
</div>
<!-- Envelop -->
<div class="eco-card eco-card-featured" data-animate>
<div class="eco-card-badge">Web App</div>
<div class="eco-card-icon">
<svg width="32" height="32" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5"><rect x="2" y="3" width="20" height="14" rx="2"/><path d="M8 21h8M12 17v4"/><path d="M7 8l3 3-3 3M12 14h4"/></svg>
</div>
<div class="eco-card-label">Visual Editor</div>
<h3 class="eco-card-title">Envelop</h3>
<p class="eco-card-desc">A modern, browser-native EnergyPlus editor. Visual HVAC design, 3D geometry, schedule editing — zero installation required.</p>
<ul class="eco-card-features">
<li>Visual HVAC node-graph editor</li>
<li>Interactive 3D geometry viewer</li>
<li>Schedule editor with day/week/year</li>
<li>Run EnergyPlus simulations in your browser — free</li>
<li>Dark mode & responsive design</li>
<li>Import/export IDF & epJSON</li>
</ul>
<div class="eco-card-code">
<code>Zero installation · Just open your browser</code>
</div>
<div class="eco-card-links">
<a href="https://app.idfkit.com" class="eco-card-link" target="_blank" rel="noopener">
Launch App
<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M7 17L17 7M17 7H7M17 7v10"/></svg>
</a>
</div>
</div>
<!-- idfkit-mcp -->
<div class="eco-card" data-animate>
<div class="eco-card-badge">MCP Server</div>
<div class="eco-card-icon">
<svg width="32" height="32" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5"><circle cx="12" cy="12" r="3"/><path d="M12 1v4M12 19v4M4.22 4.22l2.83 2.83M16.95 16.95l2.83 2.83M1 12h4M19 12h4M4.22 19.78l2.83-2.83M16.95 7.05l2.83-2.83"/></svg>
</div>
<div class="eco-card-label">AI Integration</div>
<h3 class="eco-card-title">idfkit-mcp</h3>
<p class="eco-card-desc">An MCP server that exposes building energy modeling to AI agents. Let Claude author, validate, and simulate EnergyPlus models.</p>
<ul class="eco-card-features">
<li>25 MCP tools for full workflow</li>
<li>Schema discovery & validation</li>
<li>Model authoring & modification</li>
<li>Weather station integration</li>
<li>Simulation execution & results</li>
<li>stdio & HTTP transport modes</li>
</ul>
<div class="eco-card-code">
<code>uvx idfkit-mcp</code>
</div>
<a href="https://github.com/idfkit/idfkit-mcp" class="eco-card-link" target="_blank" rel="noopener">
View on GitHub
<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M7 17L17 7M17 7H7M17 7v10"/></svg>
</a>
</div>
<!-- idfkit-docs -->
<div class="eco-card" data-animate>
<div class="eco-card-badge">Reference</div>
<div class="eco-card-icon">
<svg width="32" height="32" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5"><path d="M4 19.5A2.5 2.5 0 016.5 17H20"/><path d="M6.5 2H20v20H6.5A2.5 2.5 0 014 19.5v-15A2.5 2.5 0 016.5 2z"/><path d="M8 7h8M8 11h6"/></svg>
</div>
<div class="eco-card-label">Documentation</div>
<h3 class="eco-card-title">idfkit-docs</h3>
<p class="eco-card-desc">Interactive EnergyPlus Input/Output reference documentation. Browse object types, fields, and constraints — all searchable and hyperlinked.</p>
<ul class="eco-card-features">
<li>Searchable object type reference</li>
<li>Field-level docs with units & constraints</li>
<li>Hyperlinked cross-references</li>
<li>Built with Zensical</li>
</ul>
<div class="eco-card-code">
<code>docs.idfkit.com</code>
</div>
<div class="eco-card-links">
<a href="https://docs.idfkit.com" class="eco-card-link" target="_blank" rel="noopener">
Browse Docs
<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M7 17L17 7M17 7H7M17 7v10"/></svg>
</a>
<a href="https://github.com/idfkit/idfkit-docs" class="eco-card-link eco-card-link-secondary" target="_blank" rel="noopener">
GitHub
<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M7 17L17 7M17 7H7M17 7v10"/></svg>
</a>
</div>
</div>
<!-- idfkit-lsp -->
<div class="eco-card" data-animate>
<div class="eco-card-badge">VS Code</div>
<div class="eco-card-icon">
<svg width="32" height="32" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5"><polyline points="16 18 22 12 16 6"/><polyline points="8 6 2 12 8 18"/><line x1="14" y1="4" x2="10" y2="20"/></svg>
</div>
<div class="eco-card-label">Editor Extension</div>
<h3 class="eco-card-title">idfkit-lsp</h3>
<p class="eco-card-desc">Language Server and VS Code extension for intelligent idfkit editing. Autocomplete, hover docs, signature help, and AST-based type inference.</p>
<ul class="eco-card-features">
<li>Object type & field autocomplete</li>
<li>Inline hover documentation</li>
<li>Signature help for doc.add() calls</li>
<li>AST-based type inference</li>
<li>VS Code extension included</li>
<li>Python 3.10+ / pygls</li>
</ul>
<div class="eco-card-code">
<code>pip install idfkit-lsp</code>
</div>
<a href="https://github.com/idfkit/idfkit-lsp" class="eco-card-link" target="_blank" rel="noopener">
View on GitHub
<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M7 17L17 7M17 7H7M17 7v10"/></svg>
</a>
</div>
</div>
</div>
</section>
<!-- Features Section -->
<section class="section section-features" id="features">
<div class="container">
<div class="section-header">
<span class="section-label">Why idfkit</span>
<h2 class="section-title">Built for performance.<br>Designed for humans.</h2>
<p class="section-subtitle">Legacy tools hold you back. idfkit is built from the ground up for speed, correctness, and developer experience.</p>
</div>
<div class="features-grid">
<div class="feature-card" data-animate>
<div class="feature-icon feature-icon-speed">
<svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5"><path d="M13 2L3 14h9l-1 8 10-12h-9l1-8z"/></svg>
</div>
<h3 class="feature-title">4,000x faster</h3>
<p class="feature-desc">O(1) dictionary-based lookups vs linear scans. On a 1,700-object IDF, idfkit is 4,000x faster than eppy.</p>
</div>
<div class="feature-card" data-animate>
<div class="feature-icon feature-icon-refs">
<svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5"><circle cx="6" cy="6" r="3"/><circle cx="18" cy="18" r="3"/><circle cx="18" cy="6" r="3"/><path d="M8.6 7.4L15.4 16.6M8.6 4.8h6.8"/></svg>
</div>
<h3 class="feature-title">Reference tracking</h3>
<p class="feature-desc">Automatic live graph of cross-object relationships. Rename a zone and every reference updates instantly.</p>
</div>
<div class="feature-card" data-animate>
<div class="feature-icon feature-icon-zero">
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<pre><code><span class="code-comment"># Install</span>
<span class="code-keyword">pip install</span> idfkit
<span class="code-comment"># Load a model</span>
<span class="code-keyword">from</span> idfkit <span class="code-keyword">import</span> load
model = load(<span class="code-string">"building.idf"</span>)
<span class="code-comment"># O(1) lookup by name</span>
zone = model[<span class="code-string">"Zone"</span>][<span class="code-string">"Office_Floor_1"</span>]
<span class="code-comment"># Automatic reference tracking</span>
zone.name = <span class="code-string">"Main_Office"</span>
<span class="code-comment"># ^ All referencing objects update automatically</span>
<span class="code-comment"># Run simulation</span>
results = model.simulate()
<span class="code-keyword">print</span>(results.summary())</code></pre>
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<pre><code><span class="code-comment">// Add to your Claude MCP config</span>
{
<span class="code-string">"mcpServers"</span>: {
<span class="code-string">"idfkit"</span>: {
<span class="code-string">"command"</span>: <span class="code-string">"uvx"</span>,
<span class="code-string">"args"</span>: [<span class="code-string">"idfkit-mcp"</span>]
}
}
}
<span class="code-comment">// Then ask Claude:</span>
<span class="code-comment">// "Create an office building model</span>
<span class="code-comment">// with 3 zones and run an annual</span>
<span class="code-comment">// simulation for Denver, CO"</span></code></pre>
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<span class="code-filename">No installation needed</span>
</div>
<pre><code><span class="code-comment"># Envelop runs entirely in your browser</span>
<span class="code-keyword">1.</span> Open Envelop in any modern browser
<span class="code-keyword">2.</span> Import an IDF or start from scratch
<span class="code-keyword">3.</span> Design HVAC systems visually
<span class="code-keyword">4.</span> Edit schedules with intuitive UI
<span class="code-keyword">5.</span> View 3D geometry in real-time
<span class="code-keyword">6.</span> Simulate with in-browser EnergyPlus
<span class="code-comment"># Powered by WebAssembly</span>
<span class="code-comment"># No server required</span>
<span class="code-comment"># Works offline</span></code></pre>
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