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Load calculation
Load calculation articles unpack how heating and cooling loads are built — and why shortcuts sometimes work for screening but fail for final selection.
Contractors use this tag when moving a team from “we always install X tons” toward documented, defensible sizing habits.
Guides in this tag
- Range and Dryer Demand Factors: NEC 220.54 and 220.55
A 12 kW range counts as 8 kW - Column C is a demand in kilowatts, not a percentage. Why every dryer has a 5,000 VA floor, and how both tables strip 71% off a ten-unit building.
- Residential Load Calculation: NEC 220.82 Step by Step
Both legal methods worked on the same house: the 220.82 optional calculation and the standard Part III method with its per-category demand factors. Why a 12 kW range counts as 8 kW, and why the two methods land 21 amps apart.
- 100 Amp vs 200 Amp Service: Which Does Your Home Actually Need?
A load calculation decides it, not square footage. Walk the NEC 220.82 optional method on a real house, see which loads push you past 100 amps, and learn the 220.87 method that can prove you don't need an upgrade at all.
- Air Conditioning Load Calculation: Heating & Cooling Load Guide
Air conditioning load calculation explained - heat load calculation hvac, cooling load estimates, hvac system load calculation, manual j heat load calculation, furnace load calculation, and wrightsoft manual j basics.
- Free Manual J Calculator Guide
Free manual j calculator guide - manual j calculation online, hvac load calculator free options, ACCA Manual J inputs, and when free tools are enough vs paid software.
- Commercial HVAC Load Calculation Guide
Commercial hvac load calculation guide - commercial hvac sizing calculator methods, ASHRAE vs ACCA approaches, tons per sq ft rules, and when to use a professional engineer.
Related resources
- 05 Aug, 2026
Range and Dryer Demand Factors: NEC 220.54 and 220.55
A 12 kW range counts as 8 kW - Column C is a demand in kilowatts, not a percentage. Why every dryer has a 5,000 VA floor, and how both tables strip 71% off a ten-unit building.
- 03 Aug, 2026
Residential Load Calculation: NEC 220.82 Step by Step
Both legal methods worked on the same house: the 220.82 optional calculation and the standard Part III method with its per-category demand factors. Why a 12 kW range counts as 8 kW, and why the two methods land 21 amps apart.
- 03 Aug, 2026
100 Amp vs 200 Amp Service: Which Does Your Home Actually Need?
A load calculation decides it, not square footage. Walk the NEC 220.82 optional method on a real house, see which loads push you past 100 amps, and learn the 220.87 method that can prove you don't need an upgrade at all.
- 29 Jun, 2026
Air Conditioning Load Calculation: Heating & Cooling Load Guide
Air conditioning load calculation explained - heat load calculation hvac, cooling load estimates, hvac system load calculation, manual j heat load calculation, furnace load calculation, and wrightsoft manual j basics.
- 28 Jun, 2026
Free Manual J Calculator Guide
Free manual j calculator guide - manual j calculation online, hvac load calculator free options, ACCA Manual J inputs, and when free tools are enough vs paid software.
- 28 Jun, 2026
Commercial HVAC Load Calculation Guide
Commercial hvac load calculation guide - commercial hvac sizing calculator methods, ASHRAE vs ACCA approaches, tons per sq ft rules, and when to use a professional engineer.
- 28 Jun, 2026
HVAC Sizing Calculator: How to Size AC, Furnace & Heat Pump
HVAC sizing calculator guide - sizing ac unit calculator rules, air conditioning size calculator by sq ft, heating and cooling calculator size factors, and when to use Manual J.
- 26 Jun, 2026
Commercial HVAC Tons per Square Foot (Sizing Guide)
Commercial HVAC sizing by square feet per ton, with planning figures for offices, retail, restaurants, warehouses, and server rooms - why internal gains dominate and why a block load calc is required.
- 26 Jun, 2026
Heat Load & Cooling Load Calculation: How It Works
How an HVAC load calculation - also called an air conditioning load or AC load calculation - works: the heat-loss formula Q = U × A × ΔT, the sensible and latent parts of a cooling load, a worked residential example, and how to convert load to tonnage.
- 19 Jun, 2026
What Is Manual J? Heat & Cooling Load Calculation Explained
Manual J is the ACCA standard for calculating a home's heating and cooling load. What it is, the inputs it uses, how heat load and cooling load are calculated, and why it beats rules of thumb.
- 09 Jun, 2026
Manual J vs Rule of Thumb: When to Use Each
Manual J is a room-by-room load calculation; rules of thumb estimate tonnage from square footage. How each works, why oversizing hurts, and when each is appropriate.
Frequently asked questions
Common questions about Load calculation guides on the TradesQuote blog.
What will I find under Load calculation?+
This tag lists 11 published guides tagged or categorized as Load calculation. Topics typically include sizing, cost estimating, diagnostics, and practical contractor workflows tied to that subject.
Are these articles a substitute for code or engineered design?+
No. TradesQuote guides explain concepts and estimating shortcuts so you can work faster and communicate clearly. Always follow applicable codes, manufacturer instructions, and professional engineering requirements for the job.
How do these pages relate to TradesQuote tools?+
Many articles link to free HVAC or electrical calculators and to TradesQuote estimating features. Use the guides to understand the topic, then use the tools to produce numbers for proposals and field checks.