HVAC Load Calculator CSA F280

About this app

HVAC Load Calculator CSA F280 is the residential load calculator Canadian HVAC contractors actually want to use. From the team behind HVAC Load Calculator (Manual J) — 1,500+ downloads since our winter launch on the App Store. We rebuilt what field techs trust for Canada: CSA F280-12, postal-code climate data, and metric-first workflows — purpose-built for Canadian codes. Same offline-first design, auto-save, PDF reports, and site photos you already know. BUILT FOR CANADIAN HVAC PROS Unlike software shoehorned onto mobile, we designed this for techs on-site. Fast calculations in basements. Professional reports that win homeowner trust. Metric by default — m², kW, RSI, °C — with a full imperial toggle throughout the app and PDF exports. THREE LEVELS OF ACCURACY Simple Mode – 8 inputs: Regional climate benchmarks from your Canadian postal code and floor-area multipliers. Get an estimate in under 60 seconds with zero measurements. Perfect for quick quotes and initial sales conversations. Moderate Mode – 15 inputs: Component-level factors — insulation, windows, foundation — with a conservative safety buffer. Prevents undersizing while staying accessible for non-engineers. The sweet spot for standard replacement jobs. Pro Mode – full detail: blower-door airtightness (ACH50 / CFM50), HRV/ERV recovery, duct location and insulation, window U-factor and SHGC overrides, thermal bridging. For when the job needs every input accounted for. BUILT FOR CANADA Enter your postal code — we resolve province, city, and design conditions from NRCan HOT2000 weather data mapped to your Forward Sortation Area (FSA). Coverage from mild coastal BC to arctic climates. WORKS IN THE FIELD Offline-first — no signal in the basement? Everything runs locally. Auto-save projects. Professional PDF reports. Tagged site photos with location labels and notes in report appendices. Optimized for iPad. THE MATH YOU TRUST Calculations follow CSA F280-12 residential space heating and cooling load methodology: – Heating load (kW or BTU/hr) – Cooling load — sensible and latent (kW or BTU/hr) – Recommended cooling capacity (0.5 ton / kW increments) – Recommended furnace or heating appliance size (5,000 BTU / kW increments) – CSA F326 continuous ventilation and HRV/ERV recovery – Below-grade and foundation heat loss – Equipment sizing guidance for AC, furnace, and heat pump options Tap How Our Calculator Works for a plain-English guide to every input and how it shapes your results. Follows CSA F280-12 methodology — the standard referenced across Canadian residential HVAC practice. Not affiliated with or certified by CSA or HRAI. WHY CONTRACTORS CHOOSE US Modern, intuitive interface that makes sense the first time you use it. Dark mode and system theme support. Fast performance, even on older devices. Privacy-first: your project data stays on your device. And it's completely free. PERFECT FOR HVAC contractors, installers, and service techs across Canada. Heat pump and dual-fuel system installers. HRV/ERV installers sizing ventilation loads. Sales teams quoting new systems. Independent contractors building their business. Energy advisors and high-performance builders. No account. No setup. Just open the app and get to work. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

• Under-the-hood improvements to app startup and reliability • Added anonymous, privacy-first usage analytics to help us improve the calculator — nothing personal is collected, and you can opt out anytime in Settings • Groundwork for upcoming features

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

1. First observed Aug 11, 2026 · 7:22 AM Free