HVAC Load Calculator Manual J

Now available worldwide with metric units! Professional Manual J load calculations in Simple or Moderate mode. Works offline, generates PDF reports. The Manual J load calculator HVAC contractors actually want to use. Stop paying $40 for clunky, over-engineered calculators designed for engineers. HVAC Load Calculator brings professional Manual J calculations to your iPhone in a clean, modern app that works offline and gets out of your way. BUILT FOR CONTRACTORS, NOT ENGINEERS Unlike expensive desktop software ported to mobile, we designed this from scratch for techs working in the field. Large buttons you can tap with gloves on. Fast calculations while standing in a basement. Professional reports that win homeowner trust. TWO CALCULATION MODES Simple Mode – 8 inputs, ±15-20% accuracy Perfect for quick quotes and ballpark estimates. Get in, get your numbers, get on with the job. Fast enough to do while talking with a homeowner. Moderate Mode – 15 inputs, ±10-15% accuracy The sweet spot for most residential jobs. Enough detail to be professional without the headache. Gives you precision when you need it. NOW AVAILABLE WORLDWIDE Not just for US contractors anymore. International mode lets you enter your city, country, and local design temperatures directly. Choose your climate zone and moisture regime, and the calculator handles the rest. Full metric support (kW, m², m³/h) built in. US Mode: Enter your ZIP code International Mode: Enter your location and design temperatures manually Metric Units: Toggle between Imperial and SI units throughout the app and PDF reports WORKS IN THE FIELD Offline-First – No cell service in the basement? No problem. Everything runs locally on your device. Auto-Save Projects – Never lose your work. Every calculation saves automatically. Climate Database – Instant lookup for 80+ major US cities with smart fallback for any location. Professional PDF Reports – Generate and share detailed load reports directly from your iPhone. WHY CONTRACTORS CHOOSE US Modern Interface – Clean, intuitive design that makes sense the first time you use it. Fast Performance – Instant calculations, even on older iPhones. Free to Start – Download and start calculating immediately. Upgrade to Pro for advanced features. Privacy-First – Your data stays on your device. We never see your projects or customer information. THE MATH YOU TRUST Our calculations follow ACCA Manual J 8th Edition methodology. You get: Cooling BTU/hr (sensible and latent loads) Heating BTU/hr Recommended tonnage (rounded to 0.5 tons) Recommended furnace size (rounded to 5,000 BTU) Manual S equipment sizing guidance Kitchen/appliance heat gain per MJ8 Table 4 All calculations use industry-standard formulas trusted by HVAC professionals worldwide. PERFECT FOR HVAC contractors and installers Service technicians sizing replacements Sales teams quoting new systems Independent contractors building their business International HVAC professionals working in metric Anyone who needs quick, reliable load calculations GETTING STARTED Download and start calculating immediately. No account required, no complex setup. Just open the app and start your first project. We’re building this for HVAC professionals who work in the field every day. Got feedback? Ideas for features? We’re listening. Start calculating smarter today. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/