Spray Foam Genius Marketing helps spray foam and insulation contractors in Charleston, South Carolina win more jobs from homeowners and builders searching in that market. Use this as the Charleston brief before you write a page or an ad. The climate zone on this page is 3A. The population line reads 159,423. Every comparison below is the city number set next to the national number from the same note, when the note has one.
The local reading for Charleston is ordinary, and it is specific. Cooling is the larger degree-day number and the zone is humid, so attic heat, moisture, and air sealing belong at the front of a Charleston site. Check it against the grid. A message can be right for the climate and still be invisible three miles from the shop.
Cooling (2,448) is larger than heating (1,623). The heating degree-day value is 1,623 and the cooling value is 2,448. Both figures use base 65 F. The heating note says the reading was measured at CHARLESTON CITY. Pages and ads can lead with hot attics, summer bills, and rooms that will not cool. Put the larger load first on the Google Business Profile services and on the main service pages.
On the population line, Charleston shows 159,423. The note on that line says: Estimate for July 1, 2025. Source on this page: U.S. Census Bureau, Vintage 2025 population estimates for cities and towns, as of July 1, 2025. The county line reads Charleston County. Use the city total as context. The audit grid, not the census count, is what shows where a company actually appears.
Tenure is part of the marketing picture in Charleston: 54% of occupied homes are owner-occupied. That is lower than the national figure of 65% in the same note. The city figure is at least half, so owner-occupiers are the larger group in this survey line. They are usually the people who can commission insulation on a house they live in. Landlords and builders remain a separate audience when the owner share is modest.
The median value line reads $600,300 for Charleston. That is higher than the national figure of $360,600 in the same note. Treat it as a reference from the cited survey, not today's asking price. Market prices move after the survey date printed on the card.
Charleston's median build year on this page is 1996. That year is later than the national median of 1981 printed in the same note. The note on that line says: National median: 1981 (survey estimate, with a margin of error). Pair it with the share of homes built before 1980 when that line exists, because a median hides the older tail.
Before-1980 construction is 34% in Charleston. That share is lower than the national figure of 48% in the same note. The note on that line says: National: 48% (survey estimate). Combine this with the median year rather than quoting only one of them in an ad.
Charleston is in South Carolina, and the climate zone on this page is 3A. The moisture letter on this zone is humid (3A). The note reads: humid climate, zone 3 of 8. On the IECC scale used on our state pages, the number rises as the climate gets colder, from 1 (hot) to 8 (subarctic). Source on this page: U.S. DOE and PNNL, Guide to Determining Climate Zone by County: Building America and IECC 2021 Updates (PNNL-33270), as of October 21, 2022. Zone is a reason to lead with the jobs people in this climate ask about, not a rank factor by itself.
Use the audit to see the Charleston grid, or book a strategy call to go through it with us. We work only with spray foam and insulation contractors. Plans are month to month with 30 days notice. You buy and own your domain at a registrar you choose. We do not hold it, and we do not transfer a domain.
Local area
What Census files list for Charleston. If a line is missing, that file had nothing that met the overlap rule. Nothing here is estimated.
ZIP codes. 29492, 29414, 29412, 29455, 29407, 29403, 29401, 29409, 29425, 29424.
These are 2020 Census ZIP Code Tabulation Areas that overlap Charleston. A ZCTA is the Census stand-in for a ZIP code. It is not a USPS delivery list. Source: U.S. Census Bureau, 2020 ZCTA to Place Relationship File. Retrieved 2026-10-31.
Primary roads. I-526, Mark Clark Expressway, I-26, US Highway 17.
Limited-access highways from the 2020 Census TIGER primary roads file that cross the city boundary. Interstate labels drop the space Census stores after the hyphen. Short Census forms in the road names are written as full words. Interstate, US, state, and Puerto Rico route numbers stay as route designators. A road stored with both & and and is listed once. Source: U.S. Census Bureau, TIGER/Line 2020 Primary Roads (MTFCC S1100). Retrieved 2026-10-31.
Market facts for spray foam contractors in Charleston
Population
159,423
Estimate for July 1, 2025
Source: U.S. Census Bureau, Vintage 2025 population estimates for cities and towns. As of July 1, 2025.
County
Charleston County
County that contains the city's central point
Source: U.S. Census Bureau Geocoder (2020 county boundaries). As of 2020.
IECC climate zone
3A
humid climate, zone 3 of 8
Source: U.S. DOE and PNNL, Guide to Determining Climate Zone by County: Building America and IECC 2021 Updates (PNNL-33270). As of October 21, 2022.
Heating degree days per year
1,623
Normal, base 65 F, measured at CHARLESTON CITY
Source: NOAA NCEI 1991-2020 U.S. Climate Normals. As of 1991-2020.
Cooling degree days per year
2,448
Normal, base 65 F, measured at CHARLESTON CITY
Source: NOAA NCEI 1991-2020 U.S. Climate Normals. As of 1991-2020.
Median year homes were built
1996
National median: 1981 (survey estimate, with a margin of error)
Source: U.S. Census Bureau, 2024 American Community Survey 1-year estimates, table B25035. As of 2024.
Homes built before 1980
34%
National: 48% (survey estimate)
Source: U.S. Census Bureau, 2024 American Community Survey 1-year estimates, table B25034. As of 2024.
Owner-occupied homes
54%
National: 65% (survey estimate)
Source: U.S. Census Bureau, 2024 American Community Survey 1-year estimates, table B25003. As of 2024.
Median home value
$600,300
Owner-occupied homes. National: $360,600 (survey estimate)
Source: U.S. Census Bureau, 2024 American Community Survey 1-year estimates, table B25077. As of 2024.
Each figure links to its public source and shows the date it applies to.
Drawn from the sourced figures above. No new numbers.
Homes built before 1980
Owner-occupied homes
Median home value
Heating and cooling load in a typical year
Degree days per year, a standard measure of how much heating or cooling a climate needs.
What this means for your marketing in Charleston
54% of occupied homes in Charleston are owner-occupied (nationally: 65%), and the median home value is $600,300 (nationally: $360,600). That is close to the national mix of owners and renters. Higher home values tend to go with owners who spend on comfort and performance, so quality, warranty and results messaging usually works better than leading with price.
Charleston is in Charleston County, which falls in IECC climate zone 3A. NOAA's 1991-2020 normals for CHARLESTON CITY (about 4 miles away) show 1,623 heating degree days and 2,448 cooling degree days in a typical year, so cooling is the larger load. For a spray foam or insulation contractor, that tends to move what homeowners search for toward hot attics, high summer energy bills and rooms that will not cool. The "A" in 3A marks a humid climate, so moisture control and air sealing deserve space in your content.
The Census Bureau's 2024 American Community Survey puts the median home in Charleston at a build year of 1996 (nationally: 1981), and 34% of its homes were built before 1980 (nationally: 48%). That is a younger housing stock than most of the country. A larger share of the work comes from new construction and recent builds, so builder and developer outreach deserves a place next to homeowner retrofit pages.
Charleston had an estimated 159,423 residents on July 1, 2025 (U.S. Census Bureau). Google Maps rankings change from one part of a market to the next, so being visible near your shop does not mean being visible across the whole service area. The free Market Visibility Audit shows your ranking at a grid of points around your business.
How the Google Maps grid works in a market like Charleston
Google Maps does not show one ranking for a whole city. The result changes block by block, depending on where the searcher is standing. Our audit searches from a grid of points around your business and records where you appear at each one. Green means you are in the top 3 at that spot. Red means customers there are not finding you. For a South Carolina contractor working Charleston, green and red are positions at those points. They are not a citywide trophy.
Example from a client in Baton Rouge, Louisiana, not Charleston
How working with us goes
Spray Foam Genius Marketing works with spray foam and insulation contractors. The steps are the same in Charleston as everywhere else. Plans are month to month, and you can end service with 30 days notice.
1. Audit
We look at where your company shows up on Google Maps in the cities you serve. The Market Visibility Audit is free. It shows the current grid. It is not a forecast, and it does not promise a ranking.
2. Plan
If the work is a fit, we write a plan for the website, the Google Business Profile, and the ads for the jobs you take. We do not sell shared leads. We do not promise that only one contractor in Charleston can hire us.
3. Launch
We set up the work in the plan. You buy and own the domain at a registrar you choose, such as Namecheap or GoDaddy. We do not hold the domain, and we do not transfer it. If we build a website, we can move that website to a host you choose after you have been with us at least 90 days and you end service with 30 days notice. Before 90 days the website stays with us.
4. Monthly review
Each month we review what is live: the map listing, the pages, and the ads. We do not bill per lead or per estimate.
Services for Charleston contractors
SEO Services for Insulation Companies
For Charleston, put cooling-season searches on the core pages, because that is the larger degree-day load on this page.
Google Business Profile Optimization
The Google Business Profile for a Charleston company should list the services that match the cooling load shown in the degree days, in the words customers search.
Google Ads Management
In Charleston, owner-occupied homes are 54%. Ads still have to be aimed at people who can hire the work, inside the geography you serve.
Facebook & Instagram Ads
A Charleston social ad can speak to homes around the median build year of 1996 when the offer is retrofit or new construction.
Website Development
A Charleston website needs the services, the service area, and a way to call. You buy and own the domain at a registrar you choose. We do not hold it.
Reputation Management
In Charleston, a profile with recent reviews gives a searcher something to check before they call. The work is a steady ask, not a burst of fake feedback.
Results from other markets
These are real client results from the markets named. Client companies are not identified, and results vary by market.
Spray foam marketing in Charleston: FAQ
What climate zone is Charleston in, and why does it matter for my marketing?+
Charleston County is in IECC climate zone 3A (U.S. Department of Energy and PNNL, 2022). Climate zone drives what insulation work homeowners ask about, so it shapes which services and keywords to put first on your website and in your ads.
Is heating or cooling the bigger driver in Charleston?+
NOAA's 1991-2020 normals for the nearest weather station show 1,623 annual heating degree days and 2,448 annual cooling degree days. Cooling is the larger number, which is a useful starting point for choosing what to promote.
How old are the homes in Charleston, and does it change what I should sell?+
The Census Bureau's 2024 American Community Survey estimates a median build year of 1996 and 34% of homes built before 1980 in Charleston. A younger stock means new-construction work matters more, so reach builders as well as homeowners.
Do most people in Charleston own their homes?+
The 2024 American Community Survey estimates that 54% of occupied homes in Charleston are owner-occupied, compared with 65% nationally. Owners are usually the ones who buy insulation work, so this is the size of the group your marketing is aimed at.
How big is the Charleston market?+
The U.S. Census Bureau estimated 159,423 residents in Charleston on July 1, 2025. Population is only one input. The audit shows how many positions you actually hold on Google Maps across the area.
Do you have an office in Charleston?+
No. Our office is in Vancouver, Washington. We work with spray foam and insulation contractors across the United States and Canada.
How do I see where my company ranks in Charleston?+
Run the free Market Visibility Audit. It checks your Google Maps ranking at a grid of points around your business and shows the map in a few minutes.
Other areas in South Carolina
See where your company ranks in Charleston.
Get a free market visibility audit and see where you show up, and where you do not, across your service area.
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