Duncan Insulation is your local insulation contractor in Duncan, OK, offering spray foam, attic insulation, and crawl space services. We have served Stephens County homeowners since 2016 with written estimates and no-pressure assessments.

Duncan homes built before 1990 typically have gaps in the framing that were never sealed. Spray foam fills every opening it touches, stopping Oklahoma wind from pushing outside air into your living space. Learn more about our spray foam insulation service.
Duncan summers push past 100 degrees for weeks at a time, and your attic acts like an oven if it is not insulated properly. Keeping the attic floor sealed and well-insulated is one of the fastest ways to reduce your cooling bills.
Many older ranch-style homes in Duncan have attics that are difficult to access for batt installation. Blown-in material fills around joists, wiring, and ductwork without disturbing what is already there.
Duncan sits on expansive clay soils that hold moisture. Without proper crawl space insulation, that ground moisture works up into your subfloor and floor joists, causing cold floors and structural damage over time.
Oklahoma's persistent south winds find every gap in a home's envelope. Air sealing closes the penetrations around wiring, plumbing, and framing before insulation is installed, making the insulation itself work much more effectively.
Older homes near downtown Duncan sometimes have original fiberglass that has been sitting since the 1960s. Removing that degraded material and starting fresh with modern insulation makes a measurable difference in comfort.
Duncan sits in the heart of south-central Oklahoma, where summers regularly exceed 100 degrees and winters bring freezing temperatures and occasional ice storms. That wide seasonal swing puts constant stress on your home's insulation. When it is hot, poor insulation lets that heat pour in through the attic and walls, forcing your air conditioner to run nonstop. When temperatures drop, gaps in your building envelope let cold air push inside while heated air escapes. A home without proper insulation is working against the season no matter what time of year it is.
Much of Duncan's housing stock was built in the 1950s through the 1970s, when insulation requirements were far lower than today. Homes in those older neighborhoods - including the post-war ranch houses and brick bungalows near the downtown square - were often built with minimal attic insulation and no crawl space treatment at all. Duncan's clay-heavy soils expand and contract with every wet spring and dry summer, creating movement that degrades older insulation over time. For homeowners in those parts of town, this is not a future problem. It is already affecting their energy bills and indoor comfort today.
Duncan Insulation is based in Duncan, and we have been servicing Stephens County homes since 2016. Our crew works across all parts of the city regularly - from the established neighborhoods near the courthouse square and the Chisholm Trail Expo Center to the newer subdivisions on the north and east edges of town. We know which areas have the oldest housing stock, which streets have the thickest clay soils, and what kinds of moisture problems show up in Duncan crawl spaces after a wet spring.
Duncan is a working-class city with a strong history of skilled trades going back to its oil-industry roots. Homeowners here tend to be practical and want straight answers. When we come out for an estimate, we walk through what we found, explain what needs to be done, and give you a written number - no vague quotes, no surprises on invoice day.
We also serve nearby communities across Stephens County and the surrounding area. Homeowners in Comanche, OK deal with the same clay-soil and heat-cycling conditions that Duncan residents face, and our crew covers that area regularly. We also work in Marlow, OK and surrounding Stephens County communities.
We respond within 1 business day. A quick conversation helps us understand your home - whether it is a 1950s brick ranch near downtown or a newer build on the north side - so we prepare properly for the visit.
We visit your home, check the attic, crawl space, and any other areas you are concerned about, and give you a written estimate that explains what we found and what we recommend. No cost, no pressure.
Our crew protects your surfaces and completes the installation using the right product for your home's age, construction type, and conditions. Most Duncan jobs are done in one to two days.
We walk through the finished work with you before leaving. If you have questions after installation - whether it is about ventilation, re-entry time after spray foam, or maintenance - call us anytime.
We serve all of Duncan and Stephens County. Send us a message or call today - we respond within 1 business day and provide a written estimate before any work begins.
(580) 860-0708Duncan is the county seat of Stephens County in south-central Oklahoma, with a population of roughly 22,000 residents. The city is best known as the birthplace of Halliburton, founded here in 1919, and the oil-industry heritage still shapes the community's character. The traditional downtown district around the courthouse square includes blocks of older brick commercial buildings and established residential neighborhoods with homes dating back to the 1920s and 1930s. Newer residential subdivisions have expanded outward toward the north and east, adding a mix of construction styles from the 1990s through the 2010s.
The city sits roughly 80 miles south of Oklahoma City on US-81, giving residents access to the larger metro while maintaining the character of a small Oklahoma town. Most housing in Duncan is owner-occupied single-family homes, ranging from modest brick ranch-styles to newer vinyl-sided construction. Community landmarks include the Chisholm Trail Expo Center and Lake Duncan, which draws residents from across Stephens County. We also serve nearby Comanche, OK and the broader south-central Oklahoma region.
High-density foam offering maximum R-value and moisture resistance.
Learn MoreProfessional insulation solutions for businesses and commercial buildings.
Learn MoreBlocks ground moisture from entering your home through the crawl space.
Learn MoreReduces humidity and moisture damage in walls, floors, and ceilings.
Learn MoreCall Duncan Insulation today or submit a request online. We serve all of Duncan and Stephens County - responses within 1 business day.