Trusted Home Energy Audit for San Jose Homeowners
A home energy audit in San Jose typically costs between $199 and $499, depending on the size of your house and how many diagnostic tests you need. Most audits take two to three hours, and you’ll walk away with a room-by-room report showing exactly where your home is leaking air and wasting energy. That report is what lets you spend insulation dollars where they actually pay off, instead of guessing.
Walt’s Insulation has been running energy audits in San Jose since 2000, and we’ve seen how the same floor plan can perform completely differently depending on build quality, orientation, and what previous contractors got away with. Our audits are performed by background-checked, uniformed technicians who show up on time and explain what they’re finding as they go. You can reach a live person at (408) 837-7384 any time, day or night, to schedule your audit or ask what’s involved.
Key takeaways:
– Most San Jose home energy audits run $199 to $499
– You get a written report with photos and prioritized fixes
– We pull building permits and test with calibrated equipment, not guesses
– Live answer, 24/7: call (408) 837-7384
– All work backed by the Done Right Promise
What Our Home Energy Audit Service Includes
Every audit we run in San Jose includes the four diagnostics that actually matter. We don’t just walk around pointing at windows. We measure pressure, temperature, and airflow with equipment that gives us numbers we can stand behind.
Blower Door Test
A blower door test depressurizes your house to expose every leak path that normally hides inside walls and framing. A calibrated fan mounts in an exterior door frame and pulls air out of the house while sensors measure how hard the fan has to work to hold the pressure. The result is a single number: total air leakage, measured in CFM (cubic feet per minute).
When we test San Jose homes built in the 1960s through 1990s, we routinely find enough combined leakage to equal leaving a window open all winter. That includes gaps around can lights, plumbing penetrations under sinks, and attic hatches that were never weather-stripped. We locate those leaks precisely so your insulation dollars go into sealing them first. A house can have R-38 in the attic and still waste energy if air is streaming through a dozen small bypasses the audit exposes.
Thermal Imaging Inspection
A thermal imaging inspection shows us what the blower door can’t: where heat is moving through your walls, ceilings, and floors in real time. We use an infrared camera to scan each room while the house is under negative pressure from the blower door. Missing insulation, settled batts, thermal bridging, and air leaks all show up as temperature differences we can photograph and include in your report.
In San Jose’s older neighborhoods like Willow Glen and Rose Garden, we frequently find entire wall cavities with zero insulation because builders skipped it in interior walls and sometimes in exterior walls too. Thermal imaging catches that in minutes. We also use the camera around recessed lighting, attic hatches, and knee walls, which are among the most under-insulated areas in the typical South Bay home.
Insulation Inspection
We physically inspect your attic, crawl space, and accessible wall cavities to see what insulation is actually installed, how thick it is, and whether it’s doing its job. Most San Jose homeowners have never looked in their attic, and we regularly find fiberglass batts installed backwards, blown-in insulation that’s settled to half its original depth, or coverage blocked by improperly placed roof vents.
We measure existing R-value against what’s recommended for our climate zone and show you the gap. The attic is where most homes lose heat in winter and gain it in summer, and San Jose’s hot, dry summers make that heat gain expensive. If your insulation inspection shows you’re at R-19 when R-38 or higher is warranted, we’ll tell you, and we’ll show you exactly what it costs to fix it with Owens Corning or Johns Manville products.
Duct Leakage Test
Your heating and cooling system only works as well as the ductwork that carries air around your home. A duct leakage test pressurizes your duct system and measures exactly how much conditioned air is escaping into the attic or crawl space before it ever reaches your rooms. The Department of Energy estimates the average home loses 20 to 30 percent of conditioned air through duct leaks.
In San Jose, we test ducts in attics and crawl spaces, where hot summer air or cold winter air surrounds them year-round. Leaky ducts force your HVAC system to work harder, shorten equipment life, and drive up your PG&E bill every month. Our test gives you a leakage percentage and pinpoints the worst leaks so we can seal them with mastic and proper mechanical fasteners, not duct tape.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Brands We Service for Home Energy Audit
When we inspect insulation as part of a home energy audit in San Jose, we’re looking at whatever was installed, whether that’s fiberglass from Owens Corning, cellulose from GreenFiber, or spray foam from Icynene or Demilec. We’ve been working with these products since 2000, and we know how each one performs, settles, and ages in our specific climate.
We work with Owens Corning fiberglass and GreenFiber cellulose regularly because they’re among the most specified insulation products in California homes. When we see an Owens Corning attic that’s performing well, we can tell you exactly how much air sealing will improve it before you add more insulation. When we see Demilec or Icynene spray foam installed incorrectly, we can document it and recommend whether removal or encapsulation is the right fix.
Whether your San Jose home has Owens Corning, GreenFiber, Icynene, Demilec, or something else entirely, we can audit it and tell you what’s working and what isn’t. The audit doesn’t care what brand was installed. The report we give you does.
Signs You Need Home Energy Audit Right Now
- Your PG&E bill keeps climbing even though you haven’t changed your habits. Energy rates in San Jose keep going up, but a home that suddenly costs 20 or 30 percent more to cool in summer has a problem beyond the rate schedule. Air leaks and settled insulation show up in your bill months before you notice the comfort issues.
- Some rooms are always 5 to 10 degrees warmer or colder than the rest of the house. In San Jose’s older neighborhoods, we see this constantly in bedrooms over garages, upstairs rooms with kneewalls, and rooms at the end of long duct runs. The cause is almost always a combination of air leaks and inadequate insulation in specific spots, and an audit shows you exactly which spots.
- You feel drafts on windy days even with all the windows closed. Air moving through your home on a windy day means your building envelope has holes in it, usually around outlets, baseboards, window frames, and can lights. That’s outside air you’re paying to heat or cool, and it’s also dust, pollen, and pollution from San Jose’s freeways ending up in your living room.
- Your HVAC system runs constantly during heat waves and still can’t hold 78 degrees. San Jose summers now regularly hit the high 90s. If your AC runs non-stop and can’t keep up, you’re either losing conditioned air through leaks in the ducts or losing it through the ceiling because the attic is under-insulated. A duct leakage test and insulation inspection will pinpoint which one.
- You smell musty odors or see condensation on windows in winter. Moisture moving through your walls and ceiling is a sign of both air leakage and inadequate insulation. Condensation on window glass in winter means high indoor humidity that’s also condensing inside your wall cavities, where it grows mold and rots framing. An energy audit identifies the leak paths that carry that moisture.
Our Home Energy Audit Process - Step by Step
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Walkthrough and interview. Our technician starts by asking you what you’ve noticed: which rooms are uncomfortable, what your energy bills look like, whether you’ve had any moisture issues. We then walk through the house with you, inside and out, looking at window condition, door seals, attic access, crawl space access, and HVAC equipment location. This gives us a baseline of what the house is dealing with before we test anything.
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Diagnostic testing. We set up the blower door, pressurize your duct system, and begin scanning with the thermal camera while the house is under pressure. This is where the air leaks reveal themselves. We mark and photograph each problem area so you can see what we see. You’re welcome to watch the whole process and ask questions as we go.
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Attic and crawl space inspection. We get into the spaces where insulation and leakage problems hide. In the attic, we measure insulation depth, check for gaps and voids, look for signs of rodent activity or moisture, and verify that vents are functioning. In the crawl space, we look for missing vapor barriers, wet soil, and uninsulated ducts.
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Report and recommendations. You get a written report with photographs, measurements, and a prioritized list of fixes. We separate “do this first because it pays back fastest” from “do this eventually if you want maximum comfort.” The report includes our pricing for each fix, so you can decide what fits your budget. No pressure, no vague suggestions.
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Follow-up verification. If we perform the air sealing or insulation work, we re-test after the job to prove the improvement. We don’t just tell you it’s better. We run the blower door again and show you the air leakage number dropped. That’s how you know the work actually worked, and it’s part of what the Done Right Promise means: we don’t leave until the test says it’s right.
How Much Does Home Energy Audit Cost in San Jose?
- Basic audit (blower door test, visual insulation inspection, report): $199 to $299
- Full audit (blower door, thermal imaging, insulation inspection, duct leakage test, written report): $349 to $499
- Duct leakage test as a standalone service: $99 to $150
Your price depends on square footage, number of attic and crawl space access points, and whether your home is single-story or multi-story. Larger custom homes in neighborhoods like Almaden Valley or Silver Creek take longer to scan and test, which is reflected in the quote. What’s included in every audit, regardless of price: calibrated diagnostic equipment, a written report with photos, a prioritized recommendation list, and our pricing for each fix. You get specific numbers, not a sales pitch.
How to avoid overpaying: be suspicious of audits that cost under $100. Those are usually performed by contractors who are really there to sell you insulation, and the “audit” is a loss leader designed to generate a quote. A real home energy audit in San Jose involves calibrated equipment and takes two to three hours. That labor has a floor. You should also ask whether the technician is certified in building performance testing. We perform our audits with trained, background-checked technicians who run these tests every week, not a subcontractor doing one a month. Estimates are free, and if you have a written estimate from another company, we’ll give you a second opinion on it at no charge.
Home Energy Audit Near San Jose - Our Service Area
Walt’s Insulation is based right here in San Jose, and we run energy audits across the South Bay every day. We serve San Jose, Campbell, Los Gatos, Monte Sereno, Milpitas, Saratoga, Cupertino, Lexington Hills, Morgan Hill, and Mountain View, with no trip charge inside our service county. Our Home Energy Audit in Newark coverage extends north for our east bay neighbors. We also serve the residential areas near Home Energy Audit in East Foothills. This is the one down the road, not an 800 number in another state. We’re local, we’re published, and we answer our own phone. If you’re wondering whether we cover your specific street, call (408) 837-7384 and a live person will tell you in about ten seconds.
Serving San Jose, CA - Our Local Coverage Area
We’re based in the San Jose area and know this community well, offering a San Jose Home Energy Audit to local homeowners. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions - Home Energy Audit in San Jose
What is a home energy audit?
A home energy audit is a diagnostic test of how your house uses and loses energy. It measures air leakage with a blower door, scans for missing insulation with a thermal camera, tests duct leakage, and inspects the attic, crawl space, and walls. In San Jose, a full audit from Walt’s Insulation produces a written report with photos and our recommended fixes, priced out so you can decide what to do first.
How long does a home energy audit take?
A full home energy audit in San Jose takes two to three hours for a typical single-family home. Larger homes, multi-story homes, and homes with limited attic or crawl space access take longer. You don’t need to be home the entire time, but it helps if you’re there for the first 30 minutes to walk through the house with us and point out the comfort issues you’ve noticed.
How much does a home energy audit cost in San Jose?
A home energy audit in San Jose costs $199 to $499, depending on the size of your home and how many diagnostic tests you want. A basic audit with a blower door test and insulation inspection starts around $199. A full audit with thermal imaging and a duct leakage test runs $349 to $499. Call (408) 837-7384 for an exact quote based on your square footage. Estimates are free, and our senior and veteran discount takes 10% off every audit, always.
Do you service homes with Owens Corning or other brand-name insulation?
Yes. We audit homes insulated with Owens Corning fiberglass, GreenFiber cellulose, Icynene spray foam, Demilec spray foam, Johns Manville, Knauf, and Rockwool. The brand doesn’t matter to the audit itself. What matters is the installed condition of whatever is in your attic and walls, and we can test that regardless of manufacturer. If the insulation was installed poorly or has settled, we’ll show you in the photos.
Can you come out to San Jose on short notice for an energy audit?
We run energy audits in San Jose five days a week, and we can usually schedule within a few days of your call. If you have a specific concern like a moisture problem or a room that’s become unbearable during a heat wave, call (408) 837-7384 and tell us what’s going on. We answer the phone live around the clock, and we’ll get you on the schedule as fast as we can.
Does the home energy audit come with any warranty?
The audit itself is a diagnostic, and the report we give you becomes your reference document for all future work. If we perform any of the fixes recommended in the report, that work is covered by the Done Right Promise: lifetime workmanship, and if it’s not done right, we make it right. No runaround, no fine print, no fighting with a national call center.
How should I prepare for my home energy audit?
You don’t need to do much. Close all windows and exterior doors about an hour before we arrive, and make sure we can access the attic hatch or scuttle and the crawl space entry if you have one. If you have a gas dryer, run it briefly before the blower door test so we can verify backdrafting and combustion safety. We’ll handle the rest. If anything about your house is unusual, from a converted garage to a flat roof, tell us on the phone before we arrive so we bring the right equipment.
Schedule Your Home Energy Audit Service in San Jose Today
If your San Jose home has been uncomfortable or expensive to heat and cool, stop guessing and get the numbers. Call Walt’s Insulation at (408) 837-7384 and schedule your home energy audit today. You’ll get a live person on the phone, a free estimate, and a report that tells you exactly what’s wrong and what it costs to fix. This is the one down the road, and we’ve been here since 2000.
Written by Walt Brenner, Owner at Walt’s Insulation, serving San Jose since 2000.