Working with Dennis/Aspen Radon was a great experience. Our house had very high radon levels and unfortunately a pretty complicated layout: huge crawlspace, small basement with concrete slab and an unsealed pit for a sump pump – you name it. Dennis came up with a comprehensive mitigation plan at very reasonable cost and it had fantastic results. Radon levels are now barely measurable. The installation process was very professional, great communications and a very friendly crew. Highly recommended!!!