Radon is a radioactive gas and radiation will linger in your house. As a buyer, i will not buy a house that has radon whether mitigated or not. I will find one that does not have this issue to begin with and buy it.!!!!!
This leaves the house, effectively, radon-free or at very low levels. The outside air has naturally higher levels of radon, than the air inside a radon-remediated home. So, I would think that having a system in place would be considered a "plus".
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William Raveis Legends Realty Group
If the seller doesnt do it before you move, my suggestion is to get a credit for the cost (it will be called a sellers credit to buyre's closing costs).
Lets say the cost of the home is $300k and you are financing 10% down, $30k. If you reduce the price of the house to $298 (assume the system is $2) then you only have to put down $29,800, a savings of only $200.
If you get a sellers credit os the $2k, then you spend $2k less on closing costs. Sellers credit is better if financing.
Properly disclosed you should position the remediation system as a positive thing, and the mark of a diligent seller/owner whose goal was to make their home as safe and updated as possible.