High radon? We can fix it.

Testing is the only way to know. Radon is invisible, odourless, and tasteless, and levels can differ between neighbouring homes. Read our Calgary radon testing guide or book a radon test.

ATMOS offers short-term electronic screening, typically 48 to 72 hours, and long-term testing of at least 91 days. A longer measurement provides the clearest estimate of long-term exposure. Our testing guide explains the options and correct placement.

Health Canada recommends taking action when the long-term radon level is above 200 Bq/m³. If a reliable reading is approaching or above 200 Bq/m³, speak with a C-NRPP-certified professional about mitigation. See what to do after a high reading.

First, check the device, placement, and testing period so the result has context. High radon is fixable. ATMOS can assess the home, explain the likely entry points, and design an appropriate mitigation system. Read the step-by-step guide or request an estimate.

The most common method is active sub-slab depressurization. A quiet fan draws radon-containing soil gas from beneath the foundation and exhausts it outdoors before it can accumulate in the home. Learn more in how a mitigation system works.

A standard ATMOS mitigation installation generally takes about 5 to 8 hours. The time allows for setup, diagnostics, accessible sealing, installation, verification, and cleanup. Crawlspace encapsulation or unusually complex work can take longer.

A standard ATMOS installation starts at approximately $2,350 plus GST when an existing rough-in is usable, or about $2,500 plus GST when a new suction point is required. Complex work such as crawlspace encapsulation can reach approximately $5,500 plus GST. See the full Calgary mitigation cost guide.

There is no practical promise of absolute zero radon, but a properly designed system can dramatically reduce the level. ATMOS guarantees the home’s long-term average below 75 Bq/m³, and many homes finish substantially lower. See real mitigation results.

The manometer shows whether the system is creating vacuum, while follow-up testing confirms the radon reduction. ATMOS verifies the fan, exhaust, seals, mounting, and system operation before leaving, then follows up on post-mitigation readings.

No. Radon usually enters at the lowest level, but air movement and the stack effect can carry it through the home. Testing should focus on the lowest level where someone spends four or more hours per day.

A properly selected and installed radon fan is generally very quiet—often around 25 to 30 decibels. ATMOS positions and secures the system to limit vibration and keep the small footprint unobtrusive.

The pipe connects to a suction point beneath the basement slab or another approved collection point. It is normally routed through a mechanical room or another unobtrusive location and exhausts safely outdoors, following required clearances.

Effective mitigation requires diagnostics, correct system and fan selection, proper sealing, safe routing, and performance verification. A C-NRPP-certified mitigation professional is trained to design and verify the complete system—not simply attach a fan to a pipe.

Yes. ATMOS guarantees that systems we install will keep the home’s long-term average below 75 Bq/m³. If the long-term average is above that level, ATMOS returns to test the system and make the necessary modifications. Read how results and the guarantee work.

ATMOS provides a 10-year workmanship warranty on the installed system and a five-year manufacturer warranty on the fan. The workmanship warranty applies to ATMOS’s installation under normal use and excludes damage or later modification by others.

Yes. New and older homes can both have high radon, and a capped builder rough-in does not reduce radon until a working system is connected. Testing is the only way to know. Read our guide to radon in new Calgary homes.

During cold weather, the stack effect can increase the pressure difference that draws soil gas into a home. Closed windows and reduced natural ventilation can also affect indoor levels. Because radon varies, longer testing gives a better picture than a brief snapshot.

Verify current C-NRPP mitigation certification for the person responsible on site, proof of insurance, Alberta business registration, a clear written scope, proper diagnostics, quality materials, performance verification, warranties, and a results guarantee. Use our contractor comparison guide.