Air Pollution Control Companies
| Schaefer Ventilation Equipment (Sauk Rapids, MN)
Primarily Serving: Saint Cloud, MN - Minnetonka, MN - Minneapolis, MN - Eden Prairie, MN |
| Schmidt Heating & Cooling (Cimarron, KS)
Primarily Serving: Arapahoe, CO - Wichita, KS - Amarillo, TX - Manhattan, KS |
| Scott Electric Co (Greensburg, PA)
Primarily Serving: Pittsburgh, PA - Youngstown, OH - Canton, OH - Charles Town, WV |
| Seattle Natural Gas (Seattle, WA)
Primarily Serving: Bellevue, WA - Renton, WA - Redmond, WA - Issaquah, WA |
| Security Supply Corp (Watertown, NY)
Primarily Serving: Clay, NY - Syracuse, NY - Utica, NY - Rochester, NY |
| Sensor Air Systems (Colorado Springs, CO)
Primarily Serving: Pueblo, CO - Aurora, CO - Denver, CO - Jefferson, CO |
| Service Supply (Victoria, TX)
Primarily Serving: Corpus Christi, TX - Brazoria, TX - New Braunfels, TX - San Marcos, TX |
| Service Today (Trenton, NJ)
Primarily Serving: Levittown, PA - New Brunswick, NJ - Camden, NJ - Philadelphia, PA |
| Shaeffer Ac & Htg (Buna, TX)
Primarily Serving: Beaumont, TX - Port Arthur, TX - Lake Charles, LA - Baytown, TX |
| Shasco Wholesale (Houston, MS)
Primarily Serving: Tuscaloosa, AL - Memphis, TN - Jackson, TN - Decatur, AL |
| Sid Harvey Industries Inc (Huntington, WV)
Primarily Serving: Columbus, OH - Lexington, KY - Cincinnati, OH - Springfield, OH |
| Sid Harvey Northern Div (Marquette, MI)
Primarily Serving: Green Bay, WI - Appleton, WI - Oshkosh, WI - Duluth, MN |
| Sid Harvey Supply Inc (Westbury, NY)
Primarily Serving: Hempstead, NY - Levittown, NY - New Rochelle, NY - Bronx, NY |
| Sid Harvey's (Lakewood, NJ)
Primarily Serving: Toms River, NJ - Trenton, NJ - New Brunswick, NJ - Edison, NJ |
| Sid Harvey's (Wilkes Barre, PA)
Primarily Serving: Scranton, PA - Allentown, PA - Bethlehem, PA - Reading, PA |
| Slakey Brothers Inc (Kirkland, WA)
Primarily Serving: Redmond, WA - Bellevue, WA - Seattle, WA - Issaquah, WA |
| Slakey Brothers Inc (Modesto, CA)
Primarily Serving: Turlock, CA - Manteca, CA - Tracy, CA - Stockton, CA |
| Slant Fin Corp (Little Neck, NY)
Primarily Serving: Hempstead, NY - Bronx, NY - New Rochelle, NY - Mount Vernon, NY |
| Smithwick's Heating & Air Cond (Auburn, CA)
Primarily Serving: Loomis, CA - El Dorado, CA - Rocklin, CA - Folsom, CA |
| Smitty's Wood-Coal Furnaces (Lynnville, IA)
Primarily Serving: Des Moines, IA - West Des Moines, IA - Ames, IA - Iowa City, IA |
| Southern Califronia Air Cond (Santa Barbara, CA)
Primarily Serving: Goleta, CA - Ventura, CA - Oxnard, CA - Camarillo, CA |
| Space-Ray Colorado (Woodland Park, CO)
Primarily Serving: Colorado Springs, CO - Jefferson, CO - Denver, CO - Aurora, CO |
| Spn Enterprises (Hollis, NY)
Primarily Serving: Hempstead, NY - Bronx, NY - Brooklyn, NY - New York, NY |
| Springdale Winair (Springdale, AR)
Primarily Serving: Fayetteville, AR - Rogers, AR - Fort Smith, AR - Joplin, MO |
| Standard Air & Lite Corp (Export, PA)
Primarily Serving: Pittsburgh, PA - Youngstown, OH - Canton, OH - Akron, OH |
