Can ERVs actually dehumidify a home? And does it ever make sense to use a dehumidifier in a vented crawlspace? Two listener questions spark a lively—and slightly ruthless—discussion that leads to one of Steve’s classic lines: “Suck it up, buttercup!”

The crew digs into how moisture really behaves in dry climates, what ERVs can and cannot do when it comes to latent load management, and why dehumidification strategies that work in one climate can be completely wrong in another. They also unpack the challenges of managing moisture in vented crawlspaces and why adding equipment isn’t always the right answer.

Along the way, the conversation takes an important turn into floodplain construction, with a great discussion—and a must-read resource—on FEMA breakaway walls and how they intersect with moisture management and durability. Plenty of tough love, plenty of building science, and lots of useful takeaways despite the rough ride.

PETE'S RESOURCES:
- "Dealing with Moisture of Construction" (GBA)
- Do ERVs really manage interior sources of moisture? (GBA Q&A)
- "Understanding & Measuring Humidity" (GBA)
- "Household Sources of Moisture" (GBA)
- "Design & Construction for Breakaway Walls" (FEMA)

Windows are one of the most confusing—and consequential—components of a high-performance home. In this episode, the crew takes a deep dive into window and glass selection, aiming to make things clear without letting your eyes glaze over.

The discussion covers dual-pane versus triple-pane insulated glazing units, IGU numbering conventions, and the relatively new i89 coating—including what it means for thermal performance and condensation risk. They also unpack the difference between center-of-glass values and full-window NFRC performance numbers, and why those distinctions matter when making real design decisions.

One gem of a takeaway sums it all up, with Jake quoting Steve: “The windows, the envelope, and the HVAC are one line item.”

Pete’s Resources:

• Cardinal Glass Technical Guide (2025 Version 3.1)
• BA 0402 “Singing the Blues in the Key of Low-E”
• A Review of Advanced Architectural Glazing Technologies
• Efficient Window Coverings

A detailed look at smarter HVAC ducting, better airflow, and what it really takes to manage appliance exhaust and makeup air in high-performance homes.

The boys dive into the how and why behind HVAC duct layout, register placement, and whole-house airflow. They break down how interior design, enclosure performance, and mechanical systems must coordinate—because ducting isn’t just about energy efficiency. Thermal comfort and indoor air quality matter just as much.

They also get into makeup air, kitchen ventilation, and what happens when houses get tighter and appliances get stronger. Lots of building science, lots of clarity, and (of course) a little UBIP chaos.

PETE’S RESOURCES:

• Green Basics – GBA Integrated Design
• Building America – Ducts
• Building Science “The Perfect HVAC”
• ACCA Technical Manuals
• Mechanical Kitchen Ventilation Study
• Makeup Air Systems Example (Fantech)
• IQAir Visual Pro Monitor