Air Sealing Services in Upstate South Carolina

Stop conditioned air from escaping your home. Backed by 75+ years of building expertise, our professional air sealing reduces energy waste, lowers monthly bills, and creates a noticeably more comfortable living space.

What Is Air Sealing and Why Does Your Home Need It?

Even well-insulated homes can lose a surprising amount of energy through gaps, cracks, and unsealed penetrations in the building envelope. Air sealing is the process of identifying and closing these hidden openings so that conditioned air stays inside your home where it belongs and unconditioned outdoor air stays out.

In the Upstate South Carolina climate, hot and humid air pushes into your home through every available gap during our long summers, forcing your HVAC system to work harder and driving up energy bills. During winter, warm air escapes through the same openings, leaving rooms feeling drafty and cold. Professional home air sealing addresses this problem at the source by reducing the strain on your heating and cooling equipment and creating a more consistent, comfortable indoor environment year-round.

Where Air Leaks Happen

Air leaks are rarely visible to the untrained eye, but they are almost always present — especially in older homes throughout the Spartanburg, Greenville, and Anderson areas. Our technicians know where to look because we have been evaluating Upstate homes since 1948. The most common areas where air infiltration occurs include:

• Attic penetrations: Gaps around recessed lighting, plumbing stacks, electrical wiring, and attic access hatches allow conditioned air to rise and escape into unconditioned attic space. In many homes, the attic is the single largest source of air leakage.
• Crawl spaces and rim joists: The connection between your foundation and floor framing often has significant gaps. Humid air entering through these openings can carry moisture into your home, contributing to mold growth and poor indoor air quality.
• Windows and doors: Aging caulk and weatherstripping around window and door frames deteriorate over time, creating drafts that are easy to feel but easy to ignore.
• Ductwork chases and utility penetrations: Anywhere pipes, wires, or ducts pass through walls, floors, or ceilings, there are potential gaps that allow air exchange between conditioned and unconditioned spaces.
• Knee walls and bonus rooms: Rooms built above garages or into attic space are especially vulnerable because they are surrounded by unconditioned areas on multiple sides.

Air Sealing and Insulation Work Together

Insulation slows the transfer of heat, but it does not stop air movement. Think of it this way: a winter coat keeps you warm, but only if you zip it up. Air sealing is the zipper. Without it, conditioned air passes right through or around your insulation, reducing its effectiveness and wasting the energy you pay for every month.

That is why Bonham Insulating treats air sealing and insulation as complementary steps in any energy efficiency project. When we evaluate your home, we look at both the insulation levels and the air barrier to determine the combination of work that will make the greatest impact on your comfort and your energy bills. This consultative approach ensures you invest in the right solution — not just more material.

Our Air Sealing Process

Bonham Insulating takes a consultative approach to every air sealing project. We begin with an evaluation of your home — not a sales pitch. Our technicians assess the building envelope to identify where air leakage is occurring and determine which areas will deliver the greatest improvement in comfort and efficiency.

Once we understand your home's specific needs, we recommend a targeted plan. Depending on the areas involved, our team uses professional-grade caulk, expanding foam, rigid materials, and specialized sealants to close gaps and penetrations throughout the attic, crawl space, walls, and around ductwork. Every material is selected based on the location and size of the gap — there is no one-size-fits-all approach.

We prepare the work area before we begin and clean up thoroughly when the job is complete. Our team respects your property throughout the process, from laying down protective coverings to removing all debris and leftover materials. When we leave, you should notice the difference in your home's comfort — not evidence that we were there.

For many homes, we recommend combining air sealing with insulation upgrades to maximize the return on your investment. Our team will explain what makes sense for your property and let you make an informed decision without any pressure or unnecessary work.

Find Out Where Your Home Is Losing Energy

Schedule a no-obligation air sealing evaluation with Bonham Insulating. We will assess your home, explain what we find, and recommend the work that makes sense for your property and budget.

Schedule Your Free Consultation