Introduction

Paul Kealey is the founder and president of EcoBuilt, a company specializing in Passive House construction — a building model designed to be both highly energy efficient and genuinely healthy to live in. With nearly 25 years in the building industry and a background rooted in health, Paul joins me to talk about why so many homes — including brand new ones — are quietly making us sick, and what we can do about it.

Episode Highlights

Why Paul Got Into Healthy Home Building

Paul's path to Passive House construction started with a personal frustration: when he went looking for a home to buy, nothing felt healthy to him. New homes felt energy efficient but had poor air quality, while older homes breathed better but were inefficient in other ways.

• Paul came from a health-focused background — his mother is a doctor and he studied kinesiology
• He started with a log and timber frame company focused on natural materials, but ran into energy efficiency problems
• When he discovered Passive House, the combination of energy performance AND health protections sold him immediately
• Moisture control was the biggest factor — moisture is the number one enemy of any home, and most building systems don't handle it properly
• Studies suggest over 25% of new homes experience some form of mold — often hidden inside wall or roof cavities

What Is a Passive House?

Passive House is a building standard centered on three things: a high degree of airtightness, heavy thermal insulation, and balanced ventilation. Together, these create a home that uses very little energy while maintaining exceptional indoor air quality.

• Every Passive House includes a fresh air machine (HRV/ERV) that continuously brings in filtered fresh air while exhausting stale air
• The airtight envelope keeps outdoor toxins, pollutants, and allergens from seeping in uncontrolled
• Outdoor air is only considered healthy about 25% of the time — too hot, cold, dry, or humid the rest of the time
• Balanced ventilation means the volume of fresh air coming in equals the volume of stale air going out
• Healthy indoor humidity sits between 35–60%; Passive House systems help maintain this range automatically

The Hidden Problem With CO2 in Your Bedroom

One of the more eye-opening parts of our conversation was Paul's breakdown of bedroom CO2 levels and what that does to your health — especially your sleep and your body's ability to repair itself overnight.

• Outside air sits at roughly 400 parts per million (ppm) of CO2
• Most bedrooms without fresh air systems reach 1,200–2,000 ppm while you sleep
• High CO2 keeps your body in a stress state, preventing deep, restorative sleep
• The brain's glymphatic system — its detox mechanism — is only active during deep sleep
• If you consistently wake up tired after a full night's sleep, poor air quality or high CO2 could be a major factor

Passive Doesn't Always Mean Healthy — Why Certification Matters

Paul made an important distinction: just because a home is marketed as "passive" or energy efficient doesn't mean it's healthy. If the building system isn't vapor-open and properly certified, an airtight home can actually trap moisture and become one of the worst environments to live in.

• Building codes are designed around structural safety — snow loads, wind loads, seismic events — not occupant health
• Many builders focus on airtightness without understanding vapor-open assemblies, which is a dangerous combination
• Mold grows silently in wall and roof cavities and often isn't discovered until it's a major problem
• A certified Passive House system uses energy modeling tools to confirm the building is both vapor-protected and energy efficient
• EcoBuilt provides performance guarantees backed by previously certified homes and professional modeling
• This is why "greenwashing" is a real issue in construction — vague efficiency claims need to be quantified, not just marketed

Building New vs. Retrofitting — and How EcoBuilt Works

If you want a guaranteed healthy, high-performance home, building new is almost always the better path. Retrofits are possible but unpredictable, and the costs can spiral once walls and finishes start coming off.

• Renovations and retrofits rarely allow for fixed-price contracts because contractors can't know what's inside the walls until demolition begins
• Building new is the only way to guarantee both the budget and the performance outcome
• EcoBuilt offers pre-certified material packages with a nearly 100-page builder's handbook full of photos and illustrations
• They also offer prefabricated building options where a site supervisor is sent to work with your local contractor
• Over 75 Passive House plans are available on their website with pricing included; custom floor plans are also welcome
• Incremental cost over conventional construction should be no more than 10% — and energy savings often offset that quickly
• EcoBuilt has projects in over 30 U.S. states and six Canadian provinces

The Energy Numbers That Make Passive House Hard to Ignore

The cost savings in a Passive House are real and significant. Paul breaks it down in a way that puts the numbers in clear perspective.

• In a conventional home, roughly 90% of the energy bill goes to heating and cooling
• In a Passive House, that flips: 90% goes to running appliances, and only 10% to heating and cooling
• Total annual heating and cooling costs in a Passive House: under $300 — regardless of climate
• Heat recovery ventilation systems recover up to 90% of heat from outgoing stale air, pre-warming incoming cold air in winter
• Passive Houses use air-source heat pumps rather than gas or propane, and the insulation means the system runs very little
• The analogy Paul uses: a Passive House is like a high-performance Yeti thermos compared to a cheap hardware store thermos

3 Tests to Find Out If Your Home Is Making You Sick

Paul closed with practical, actionable steps any homeowner can take right now to understand what's going on with their indoor air — no new build required.

• Test for mold: The ERMI/HertzMe2 test is a dust swab test that can identify multiple types of mold in the home — this is what led one EcoBuilt customer (diagnosed with Chronic Inflammatory Response Syndrome) to finally understand why she was sick
• Monitor CO2 and humidity: A device like the Swidget (an air quality monitor built into a light switch plate) can track CO2 and humidity levels in real time
• Hire an energy auditor: An auditor can measure how leaky your home is and identify where air — and toxins — are getting in
• Symptoms that may point to an air quality problem: fatigue, chronic sinus infections, headaches, low-grade fever, or morning grogginess
• Also check radon and carbon monoxide — both are known silent killers that are easy to test for

Notable Quotes from this Episode

The biggest misconception in new homes is that a new home is a healthier home.
Paul Kealey

If we fix the home, we can fix the body. Our bodies are under stress constantly throughout the day. The only real way to detox the body properly — since we spend 90% of our time indoors — is to put ourselves in a situation where the body can repair.
Paul Kealey

Moisture is the number one enemy when we're dealing with any type of home. If homes aren't built properly to be vapor open and dissipate moisture, that's when you get mold — and most of the time we can't see it until it's a big problem.
Paul Kealey

Make your home your haven. We need that safe space for the body to do its healing — we have enough stressors everywhere we go.
Julie Howton