Closed cell spray foam is denser and more rigid, providing a higher R-value per inch and a strong moisture barrier — making it ideal for exterior walls, crawl spaces, and humidity-prone areas. Open cell foam expands more and is better suited for interior walls, attics, and spaces where flexibility is needed. Both types seal air leaks while insulating, which makes them more effective than standard batt insulation in many applications. The right choice depends on where the foam goes and what the space requires.

Yes — and the difference is often noticeable fairly quickly. Your duct system is the pathway for every bit of air that moves through your home, so whatever collects inside those ducts gets recirculated every time the system runs. Dust, pet dander, mold spores, and other debris build up over time and end up in the air your household breathes. A thorough cleaning removes that buildup at the source, which is particularly meaningful for anyone dealing with allergies or respiratory issues.

Common signs include uneven temperatures between floors, higher-than-normal heating and cooling bills, and ice dams forming on the roof in winter — all frequent issues in Chicago-area homes. You can do a basic check yourself: if the insulation sits at or below the top of the floor joists, it's likely underperforming. A professional inspection gives you a more complete picture, including R-value assessment and any moisture or mold concerns. Topping off existing insulation is often enough, but significant settling or moisture damage may call for full replacement.

It's genuinely necessary — not a service added to pad an invoice. Lint accumulation inside a dryer vent restricts airflow, puts stress on the appliance, and significantly increases the risk of a dryer fire. If your clothes are taking longer to dry than they used to, or the outside of the dryer feels unusually hot during a cycle, those are clear signs the vent needs to be cleared. Keeping it clean is a simple maintenance step with a serious safety benefit.

A whole house humidifier connects directly to your HVAC system and treats all the air circulating through your home — not just a single room. Portable units require constant refilling, cover limited square footage, and struggle to maintain consistent humidity in larger spaces. During Chicago winters, when indoor air becomes extremely dry, a whole-home system maintains proper humidity automatically without any ongoing effort from you. It also protects hardwood floors, wood trim, and furniture from the damage that dry air causes over time.

The drill and fill method involves making small holes — typically 1 to 2 inches — directly into the wall cavity from the interior or exterior, then injecting insulation into the space. The holes are patched and finished cleanly afterward, leaving minimal visible evidence of the work. This approach is common in older Chicago-area homes built without adequate wall insulation. It's an effective way to improve thermal performance significantly without the cost and disruption of tearing out and replacing drywall.

Yes — Clean Air Doctors handles both residential and commercial properties throughout Chicago and the surrounding suburbs. Commercial duct systems require different equipment and a different approach given the scale, but the standard of work remains the same. Service areas include Naperville, Schaumburg, Arlington Heights, Evanston, Downers Grove, Oak Brook, Wheaton, Bolingbrook, and many more communities across Chicagoland. Call (773) 669-6139 to discuss your property and get a straightforward estimate.