Radon mitigation in Cheyenne is mostly the same physics as anywhere else, with a Wyoming climate layered on top. A fan lowers the air pressure in the soil beneath the house so radon flows into a pipe instead of your living space. But a system that will run through January at 6,000 feet, in steady wind and with snow loads on the roof, needs a little more thought about where things go. Here's what a homeowner should understand before getting quotes.
Why houses pull in radon, especially here
Warm air rises and leaks out through the attic and upper floors of a house. That loss has to be replaced, and part of the replacement air comes from the soil through openings in the foundation. The colder it is outside, the stronger the effect. Engineers call it the stack effect. Cheyenne's long heating season keeps that suction running for much of the year, which is one reason indoor radon in cold climates often peaks in winter.
The standard fix: active soil depressurization
The EPA describes active soil depressurization as the most common and usually most effective approach for existing homes. Variants include:
- Sub-slab suction beneath basement floors and slabs, the bread-and-butter system in Cheyenne. Details are on our basement and slab page.
- Sub-membrane suction in crawl spaces, where a sealed plastic sheet covers the dirt and the fan pulls from underneath.
- Sump and drain-tile suction where a perimeter drain system already exists.
- Block-wall suction for hollow-core block foundation walls.
Parts of the system
- One or more suction points through the slab or under a membrane.
- PVC pipe, sealed at every joint and sloped so condensation drains back to the soil.
- An inline fan, located outside the conditioned living space: in the attic, the garage, or outdoors.
- A discharge point above the roof and away from windows and doors.
- A manometer, the small U-tube gauge that shows the fan is pulling.
- Sealing of accessible cracks, gaps, and the sump lid.
- A label with the installer's information and the date.
Questions about a reading? A certified Cheyenne-area pro can help. (307) 317-5825
Cold-climate details that matter in Cheyenne
Condensation and freezing
The soil air a radon system moves is relatively warm and humid. When it travels through pipe in a cold attic or up an outside wall in January, moisture condenses. Pipes must slope so that water drains back down rather than pooling in the fan, and installers in cold places often prefer interior or garage routes for that reason. Exterior runs can work, but ask how the installer handles freezing at the discharge.
Snow and roof discharge
The exhaust needs to clear the roof edge and stay clear when snow builds up. A discharge that gets buried in a drift stops working, or worse, blows radon back toward the house.
Wind
High winds can affect suction at the outlet and the house's own pressure. A properly sized fan overwhelms those swings. An undersized one may not.
Fan location
The fan must never sit inside the living space or the basement, because the pipe downstream of the fan is under positive pressure and any leak would push radon into the house. An attic or garage location also protects the fan from the worst of the weather.
How to tell a careful installer from a quick one
Certified mitigators follow the ANSI/AARST soil gas mitigation standards for existing houses. Signs of a careful job:
- A diagnostic test before the quote, checking how air moves under the slab.
- A written proposal showing the suction point, pipe route, and fan location.
- Clean sealing at the slab penetration and accessible cracks.
- A manometer and label installed and explained.
- A post-mitigation test at least 24 hours after start-up and within 30 days.
- A written reduction guarantee, usually below 4 pCi/L, plus fan warranty terms.
Because Wyoming has no state license, certification through NRPP or NRSB is the main credential to ask for.
Questions about a reading? A certified Cheyenne-area pro can help. (307) 317-5825
What it typically costs
Every house is priced individually. As a national benchmark, Angi's 2026 data from 1,184 projects puts a typical active suction system at $805 to $1,326, averaging about $1,043. Costs tend to rise with multiple suction points, crawl space membranes, long interior pipe runs, finished basements, and electrical work. We don't set or know any local professional's prices in advance. These are typical national ranges only, and your quote comes directly from the pro.
Living with a system
- Power. The fan runs nonstop. Wattage varies by model; ask for the specification.
- Heat loss. Some systems pull a small amount of conditioned air into the soil. In a cold climate, good sealing keeps that to a minimum.
- Checks. Look at the manometer every few months. A level U-tube means the fan isn't pulling.
- Retests. Test every two years or so and after big renovations.
A word on new homes
Some newer Cheyenne-area builds include a passive radon pipe that can be activated with a fan. If your house has a capped pipe labeled "radon" in the basement or utility room, a test will tell you whether it's enough on its own. Often, adding a fan is a modest job.
Cheyenne housing and system design
Cheyenne's housing stock spans more than a century, and each era raises its own design questions:
- Historic Avenues and downtown-area homes often have older basements, sometimes stone or block, with mixed or partly dirt floors. These may need membrane work in addition to slab suction.
- Post-war ranches and split-levels usually have poured basements or garden levels. They're good candidates for a single sub-slab suction point when there's gravel under the floor.
- Newer subdivisions on the north and east sides tend to be tighter, more energy-efficient houses. That's good for heating bills, but a tight house can let radon accumulate, so testing matters even in a brand-new home.
Questions about a reading? A certified Cheyenne-area pro can help. (307) 317-5825
Common questions about Cheyenne systems
Can the fan go outside in a Wyoming winter?
Radon fans are built for outdoor or attic use, but extreme cold, wind, and ice at the outlet are real considerations here. Many installers prefer an attic or garage location for protection and drainage.
Does a system work during summer, too?
Yes. The fan runs continuously all year. Radon levels and the stack effect are often lower in summer, but the system keeps the soil depressurized regardless.