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Sizing
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.
What Size Mini Split Do I Need? (Sizing Chart)
How to size a ductless mini split: a BTU-by-room-size chart, single-zone vs multi-zone sizing, why oversizing wrecks an inverter, and the adjustments that change the number.
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.
How to Size a Dehumidifier for Your Home
How to size a dehumidifier by square footage and dampness level, what the 2019 DOE pint rating change means, and when to choose a whole-house unit over a portable.
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.
What Size Heat Pump Do I Need? A Guide for Cold Climates
Size a heat pump for both cooling and heating with balance-point analysis for cold climates, climate zone factors, and when to add backup heat.
Furnace Sizing Guide: What Size Furnace for My House?
Find the right furnace BTU for your home by climate zone and insulation with AFUE adjustment, worked examples, and why oversizing is the most common mistake.