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Tom Decker

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Entries by Tom Decker

What is Your ACH50?

ACH50 is a blower-door test measurement that indicates how leaky your home is. A home near 1 ACH50 is tight, efficient, and high-performing

Why Is My Second Floor So Hot?

A hot second floor is usually more than just an AC problem—it’s often caused by attic heat, air leaks, poor insulation strategy, humidity, and airflow issues throughout the home.

DIY Fixes That Work

If your home is uncomfortable in both January and July, start with DIY improvements that target airflow, air mixing, and humidity.

Why Your Furnace Can’t Keep Up

Warm air rises and escapes at the top of the house. The escaping air creates a vacuum that pulls cold air in from the bottom. The colder it gets outside, the stronger this effect becomes.

R-49 Attic Insulation

When you upgrade an attic the right way—especially when you air seal and insulate the top of the home—energy outcomes can be dramatic.

Chicago’s Deep Freeze

Insulation is the foundation of home comfort. It fixes the problems most assume are caused by the furnace, the thermostat, or Chicago winters.

Closed-Cell Spray Foam Truths

All spray foams start with high initial R-values, the LTTR value matters—reflecting long-term performance after the blowing agent diffuses and stabilizes.

The Stack Effect

In Chicago’s older housing stock, where insulation and air-sealing are minimal, the entire structure behaves like a vertical chimney.

Recent Projects

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Chicago Green Insulation
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