Airtight Radon Solutions LLC

Airtight Radon Solutions LLC does radon testing and mitigation, and its website names a service area of Nashua, Milford, Amherst, Mont Vernon, Hudson, Windham, Londonderry, Litchfield, Lowell and Methuen. It holds a 5.0-star average from 25 HomeAdvisor ratings and an A grade at the BBB. A recent customer said the owner, Marcel, came to assess the situation, made the arrangements including the electric, and the radon mitigation was all done the same day; that customer said Chris, who installed it, answered their questions and explained how it works. A recent customer wrote "He came the same day I called" and said the job got done quickly, with an explanation of how the radon system worked. A 2025 customer said their Airthings device showed radon rise from 2.1 to 23.0 pCi/L, that Marcel answered the phone and offered to come to the house that same morning, and that he explained the mitigation system and its 7-year warranty. That 2025 customer said he installed the system the next week in about 3.5 hours, for $2,150, and the basement then read 0.5 pCi/L. A 2025 customer said Marcel added a fan to convert their existing passive system to an active radon system, at a cost they found reasonable compared to competitors. A 2025 customer said their radon eye read up to 40 before the installation and 2 and below after, and that Marcel planned the layout so the system would look neat. A 2025 customer said Marcel shared testing results as he went, checked and rechecked his measurements and cuts, and left an instrument to monitor radon levels for a few days. A 2024 customer said pre-mitigation testing showed 3 to 12 pCi/L, the job was complete in less than a day, and levels afterward averaged 1.7 pCi/L over three days. A 2024 customer said they got a fast response and a reasonable charge to replace a radon fan motor.