Corn Sweat and Your HVAC

🌽 What Is Corn Sweat?

Corn sweat refers to the moisture that corn plants release into the atmosphere through a natural process called transpiration.

🔬 Transpiration: The Science Behind It

• Just like humans sweat to cool down, plants release water vapor through small pores in their leaves called stomata.
• During hot, sunny days, corn (and other crops) draw large amounts of water from the soil and “sweat” it out into the air.
• This adds significant humidity to the air — especially noticeable in areas with dense cornfields, like the Midwest U.S.

💧 How Much Moisture Are We Talking?

• An acre of mature corn can release up to 4,000 gallons of water into the air per day.
• When temperatures are already high, this extra moisture can raise the dew point and make the air feel oppressively muggy.

🌡️ Why It Matters

• “Corn sweat” can significantly impact the local heat index, making it feel hotter than the actual temperature.
• This is especially relevant during heat waves when both heat and humidity spike, raising the risk of heat exhaustion or heat stroke.

🧠 Fun Fact:

Meteorologists in states like Iowa, Illinois, and Wisconsin regularly factor in corn sweat when calculating humidity and heat index forecasts in summer!

🌽 Corn Sweat vs. Your A/C

Cornfields can turn the Midwest into a giant steam room. When dew points rocket past 70 °F, your air conditioner has two jobs:

1. Drop the temperature — easy enough.
2. Pull gallons of water out of the air — that’s the hard part.

🏠 What Homeowners Notice

• Longer run-times & higher bills – Your system must condense all that extra vapor into liquid be
  fore you feel cool.
• Clammy rooms even at 72 °F – High humidity slows sweat evaporation from your skin, so you still feel sticky.

🔧 How to Help Your A/C Beat Corn Sweat

Keep your cool—even when the corn’s sweating buckets.