Most homeowners shopping for insulation are focused on price. That’s understandable — but it’s also why so many insulation jobs don’t deliver the comfort and efficiency improvements people were hoping for. The difference between a contractor who installs insulation and one who actually solves your home’s comfort and efficiency problems comes down to a few key questions. Here’s what to ask — and what the answers should tell you.
What Is Building Science — and Why Does It Matter?
Most people have never heard the term “building science.” That’s not surprising — even many professionals in the trades either haven’t encountered it or don’t take it seriously. But building science is a real and well-established field of knowledge that explains how the components of a home — insulation, air sealing, ventilation, heating and cooling systems, and moisture management — work together as a system.
Understanding building science is what separates a home performance contractor from someone who simply installs insulation. It’s the difference between treating a symptom and solving the actual problem. And it’s the reason the questions below matter.
Question 1 to Ask Your Insulation Contractor: Do You Do the Work Yourselves?
This question gets at accountability — and it’s one most homeowners never think to ask.
When the company you hire does its own work with its own trained employees, there’s a direct line of accountability from the person who assessed your home to the people doing the work to the result you experience. If something isn’t right, there’s one phone call to make and one company responsible for fixing it.
When work is subcontracted, that line gets complicated. The company you hired and the crew actually doing the work may have different standards, different training, and different priorities. The person who sold you the job may never set foot in your attic. And when something isn’t right — as it sometimes isn’t — the accountability conversation gets complicated quickly.
At Home Energy Solutions, every job is done by our own trained employees. We don’t subcontract. The people doing the work in your home are the same people accountable for the result.
Question 2 to Ask Your Insulation Contractor: How Do I Know This Will Solve My Problem?
This is the science question — and the answer reveals whether a contractor is guessing or diagnosing.
A commodity insulation contractor will typically do a visual inspection, look at your existing insulation levels, and recommend adding more. That’s not nothing — but it’s also not a diagnosis. It doesn’t tell you how much energy your home is actually losing, where it’s going, or whether insulation is even the primary issue.
A home performance contractor uses diagnostic tools to measure what’s actually happening before recommending anything. The most important of these is a blower door test — a calibrated fan that temporarily depressurizes your home to measure precisely how much air it’s losing. Combined with an infrared camera, we can find exactly where that air movement is happening and show you the evidence before a single recommendation is made.
We also measure after the work is done. That before and after comparison is your proof that the job accomplished what it was supposed to — not just our word for it.
If a contractor can’t explain how they’ll measure the problem before they fix it, that’s worth paying attention to.
Question 3 to Ask Your Insulation Contractor: How Are Your Installation Staff Trained?
The answer to this question will tell you more than almost anything else about what kind of contractor you’re dealing with.
“They’re experienced” is not a training standard. Experience means someone has done something many times — it doesn’t mean they’ve done it correctly, or that they understand why what they’re doing matters. Building science has a body of knowledge behind it, and the professionals who practice it seriously pursue recognized certifications that verify that knowledge.
At Home Energy Solutions, every new employee earns their Building Performance Institute Building Science Principles certificate before they’re allowed to work in a customer’s home. The Building Performance Institute — BPI — is the nationally recognized credentialing organization for home performance professionals. Their certifications require demonstrated knowledge of how homes work as systems, not just how to install a specific product.
We’re also currently the only home performance and insulation contractor in northeast Wisconsin with a BPI certified Building Analyst on staff. That certification requires a higher level of diagnostic and analytical expertise — and it means the person assessing your home understands not just what to look for, but why it matters and what to do about it.
Ask any contractor you’re considering what certifications their staff hold. Then look them up.
The Bigger Picture
These three questions aren’t designed to be a gotcha. Most insulation contractors are honest people doing their best with the knowledge and tools they have. But the home improvement industry has a fragmentation problem — different trades solving different pieces of the same puzzle, often without talking to each other or understanding how their piece affects everything else.
Building science exists to solve that problem. It treats your home as a complete system rather than a collection of isolated components. A contractor who understands building science doesn’t just install insulation — they diagnose why your home is uncomfortable, inefficient, or unhealthy, and address the actual cause.
The questions above are designed to help you find that contractor. Whether that’s us or someone else, you deserve to work with someone who can answer them confidently.
One More Thing Worth Asking Yourself
Before you call anyone, it’s worth knowing what problem you’re actually trying to solve. Are you uncomfortable? Are your energy bills too high? Do you have moisture or air quality concerns? The clearer you are about the symptom, the better any contractor can diagnose the cause.
If you’re not sure where to start, that’s exactly what a home energy assessment is for. Learn more about our assessment process here.
Contact us or fill out our estimate request form and we’ll start the conversation. We’ll ask you the right questions too.
- Why Are My Windows Wet — and Will New Windows Fix It? - April 16, 2026
- Three Questions to Ask Before Hiring an Insulation Contractor - April 15, 2026
- What Makes a Home Performance Contractor Different From an Insulation Company? - April 10, 2026
