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Serving Mount Pleasant, SC and surrounding areas. (854) 858-0208
Hot Lowcountry air finds every gap in your home's envelope and works its way in all day, every day. We find and close those leaks in the attic, crawl space, and walls - and prove the results with blower door testing.
Air sealing in Mount Pleasant means finding and closing the gaps, cracks, and openings where hot outside air sneaks in and cooled air leaks out. Most jobs on a single-family home take one to two days, covering the attic, crawl space, and any other problem areas identified during the assessment.
The gaps are often invisible - hidden in attic floors, around electrical outlets, behind walls, and where pipes pass through framing. The U.S. Department of Energy estimates that air leaks can account for 25 to 40 percent of the energy used for heating and cooling, which means your air conditioner is working overtime to replace cool air that is quietly escaping through gaps your HVAC system cannot see. Combining air sealing with basement insulation or attic air sealing delivers the most complete envelope improvement. The Department of Energy explains how air sealing works in detail.
Most homeowners notice the difference within the first week - rooms that used to feel stuffy or drafty become more consistently comfortable, and lower utility bills usually follow within the first full billing cycle.
If your air conditioner runs most of the day during a Mount Pleasant summer but certain rooms still feel warm and muggy, hot outside air is getting in faster than your system can handle. Attic access hatches, recessed light fixtures, and older ductwork are all common entry points for air leaks in this area's housing stock.
An unsealed crawl space in the Lowcountry acts like a sponge, pulling in warm, damp air from outside and pushing it up into your living space. If you notice a musty odor in your home, see condensation under the house, or had a pest inspector mention moisture issues, air sealing and crawl space work is likely overdue.
Hold your hand near an electrical outlet on an exterior wall. If you feel a faint draft, that is outside air coming through gaps in the wall cavity. This is more common in homes built before the mid-2000s and is an easy-to-spot sign that your home's envelope has gaps worth sealing.
Insects and small pests follow the same air pathways that cause energy loss. If you have dealt with recurring ant, roach, or rodent issues in a well-maintained home, unsealed gaps in the foundation, crawl space, or attic floor may be giving them easy entry. Sealing those gaps addresses both the energy problem and the pest pathway.
We seal gaps systematically - starting with the attic floor, where the most significant leakage typically occurs, then moving to the crawl space and any other problem areas identified during the assessment. We use spray foam for gaps around pipes and wires, caulk for smaller cracks along framing and trim, and weatherstripping for moving parts like attic hatches and doors. For homes where the attic is the primary concern, attic air sealing addresses the specific penetrations - light fixtures, HVAC boots, top plates - that allow the most conditioned air to escape.
In homes built on crawl spaces - which describes a large share of Mount Pleasant properties due to the area's high water table and flood zone requirements - the crawl space is often where the biggest savings are found. A thorough sealing job here pairs well with basement insulation to create a complete lower-envelope solution. After every project, we run a blower door test to give you a real before-and-after number showing exactly how much improvement was made.
Suited to any home where conditioned air is escaping through top-plate gaps, recessed fixtures, or HVAC boot penetrations above the living space.
Best for homes on raised foundations where warm, humid outside air enters from below and drives up both cooling costs and moisture levels.
For homeowners who want a comprehensive job covering attic, crawl space, walls, and all penetrations in one visit.
A measurable before-and-after test that shows exactly how much air leakage was reduced - so you have proof, not just a contractor's word.
Mount Pleasant's year-round heat and humidity make air sealing a cooling problem, not a heating one. Your air conditioner runs hard for seven or eight months a year, and every gap in your home's envelope lets hot, muggy outside air in while your cool air escapes. Homes built before modern energy codes in neighborhoods like the Old Village and Snee Farm were constructed without the tight-building techniques that newer construction uses, leaving gaps around plumbing, electrical, and HVAC penetrations that were simply never sealed. The payback period for air sealing in this climate tends to be shorter than in cooler regions because the demand on your cooling system is so consistent.
Homeowners in West Ashley, SC deal with the same crawl space challenges - many properties in that area are built on raised foundations with the same high-humidity conditions pulling air upward into the living space. Residents in Summerville, SC benefit from the same whole-home sealing approach, particularly as older homes from the same build era reach the age where gaps around aging ductwork and plumbing become significant. Dominion Energy South Carolina offers energy efficiency rebates that can reduce your out-of-pocket cost - ask us which programs your project qualifies for before work begins.
We respond within one business day. Tell us your home's age, size, whether you have a crawl space or slab, and what has been bothering you - high bills, drafts, or humidity. This helps us come prepared with the right tools and a realistic sense of the job.
We walk through your attic, crawl space, and main living areas, then run a blower door test to measure exactly how leaky your home is and pinpoint where the air is moving. The assessment takes one to two hours and gives you a clear picture before any work begins.
After the assessment we walk you through what we found and what we recommend. The estimate covers which areas will be sealed, what materials will be used, how long the work will take, and the total cost. We also flag which Dominion Energy or federal programs your project may qualify for.
We systematically seal gaps in the attic floor, crawl space, around pipes and wires, and at any other problem areas. After the work is complete, we run a second blower door test so you can see the before-and-after numbers - proof the job was done thoroughly, not just quickly.
No pressure, no obligation. We test your home, show you the numbers, and give you a clear written quote before any work begins.
(854) 858-0208We run a blower door test before and after every air sealing project so you have a real, measurable number - not just our word - showing exactly how much improvement was made. A contractor who skips this step is asking you to take the quality of the work on faith.
A large share of Mount Pleasant homes are built on crawl spaces because of the area's high water table and flood terrain. We understand how to seal and encapsulate these spaces properly in a humid coastal climate - not just how to get in and out quickly.
Sealing a home too tightly without proper ventilation can trap moisture and stale air - a real concern in Mount Pleasant's climate. We assess your home's ventilation as part of every project and flag anything that needs to be corrected before we close any gaps.
Federal tax credits for home energy improvements are currently available, and Dominion Energy SC has offered rebates for qualifying air sealing work. We know which programs apply to which projects and can help you get the documentation you need to claim them.
These are the things that separate a thorough air sealing job from one that only looks complete. We stand behind the work with a clear written summary of everything sealed - keep it for your records and for any rebate or home-sale documentation you may need later.
Complete the lower envelope of your home - pair crawl space air sealing with below-grade insulation for a full barrier against ground-level heat and moisture.
Learn MoreTarget the attic floor specifically - closing the light fixture, HVAC boot, and top-plate gaps that account for the largest single share of home air leakage.
Learn MoreMount Pleasant summers are long - schedule your air sealing assessment this fall and go into next cooling season with a tighter, more efficient home.