What is a long-term test?
A long term test is a test from 91 to 365 days. A long-term test will tell you your home’s year-round average radon levels under your living conditions. This is considered the most accurate way to test. During a long-term test there are no special requirements you may open doors and windows and operate fans. The disadvantage of the long-term test is that if your home has high radon levels it may take up to a year to find out your test results.