10/29/2026
The weather that makes radon testing most accurate is the weather you're about to shut the windows for. 💨🏠
A radon test needs closed-house conditions to be reliable: windows shut, doors kept closed, the home breathing the way it breathes in winter. As heating season sets in across Greater Philadelphia, the same sealed-up house that traps radon is the house that gives you the most accurate reading.
Pennsylvania sits in the country's highest-risk radon territory: Bucks, Chester, and Montgomery Counties are EPA Zone 1. And this isn't a background concern. Radon is the leading cause of lung cancer among nonsmokers, linked to roughly 21,000 US deaths a year.
What a professional test looks like:
✅ A DEP-certified electronic monitor in the lowest level suitable for occupancy
✅ 48 hours of proper closed-house conditions
✅ Results in pCi/L, checked against the EPA action level of 4.0
At ValueGuard we test only, we don't perform mitigation, so the result stays objective. Radon testing is a low-cost add-on, far cheaper than discovering a problem after move-in.
Testing is the only way to know what your air holds. As the windows close for the season, make sure you know.
📞 215-860-3150
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