HVAC Sizing Knowledge Hub
Stop guessing. Learn the science behind proper heating and cooling load calculations.
The '500 Sq Ft per Ton' Rule is Costing You Money
Why the 1970s 'Rule of Thumb' fails for modern homes, and the math behind why insulation matters 3x more than floor area.
What is a Manual J Calculation? (Simplified)
The 'Gold Standard' for HVAC sizing explained in plain English. Learn the difference between a full audit and a block load estimate.
Oversized vs. Undersized AC: Which is Worse?
Think "Bigger is Better"? Think again. Why oversized units cause short cycling, humidity issues, and mold risks.
Understanding Delta T (ΔT): The Most Important Number in HVAC
Delta T is the temperature difference between inside and outside. Learn why it's the primary driver of your HVAC load calculation.
Sensible vs. Latent Load: Why Humidity Matters in HVAC
Your AC cools temperature AND removes moisture. Learn why latent load is just as important as sensible load.
Why Your Neighbor's AC Size Doesn't Matter for Your Home
Identical house models can need 30-40% different cooling capacities. Learn how orientation, windows, shade, and solar gain affect your load.
Heating Load 101: Sizing Furnaces for Chicago Winters
Winter heating is completely different from summer cooling. Learn why HDD (Heating Degree Days) determines your furnace size in cold climates.
Phoenix vs Las Vegas: Why 111°F Isn't the Same
Both cities hit 110°F+, but Phoenix needs 20% more cooling capacity. Real ASHRAE data reveals why elevation and humidity matter.
The Florida Problem: Why Miami Needs More Than Cooling
Miami's 91°F feels worse than Phoenix's 111°F. Learn why a 77°F wet bulb forces your AC to work 30% harder on dehumidification.
Texas Heat Waves: Sizing for 100°F+ Design Temps
Dallas, Houston, and Austin all hit triple digits, but their HVAC requirements differ. Compare the Big Three Texas cities.
California Coastal vs Inland: Sacramento vs San Diego HVAC
California is not one climate. Compare San Diego, Los Angeles, Sacramento, and Fresno to see why inland homes need dramatically more cooling capacity.
Arizona Desert HVAC: Tucson vs Phoenix Sizing
Arizona is not one desert load. Compare Phoenix, Mesa, Scottsdale, and Tucson to see how monsoon wet-bulb and elevation change tonnage.
Illinois HVAC Sizing: Chicago's Dual-Season Load
Illinois is not just a heating market. Chicago's 90°F summers, 74°F wet bulb, and 3°F winters force homes to size for both humidity and deep cold.
Nevada HVAC: Reno vs Las Vegas Sizing
Southern Nevada is a cooling market. Reno is a high-desert heating market. Compare Las Vegas, Henderson, and Reno to see why one state needs two strategies.
More Guides Coming Soon
Upcoming topics: High Altitude HVAC, Insulation Upgrades, Equipment Selection, and More.