- Shadetree Mechanical Inc
- Shadle's Outdoor Wood Furnace
- Shedlock Heating & Air
- Sheet Metal Contractors Inc
- Shropshire HVAC Repair
- Siemer Heating & Cooling
- Sierra Air
- Sierra Cen-Cal Heat & Air
- Sierra Furnace Works
- Sierra Heat & Air
- Signature Heating & Cooling
- Sisler Heating & Cooling Inc
- Skips Svc
- Slanec Sheet Metal Co
- Slater's Furnace Co
- Slup's Heating & Air Cond
- Snell Enterprises Inc
- Snider Mechanical Systems
- Snider Mechanical Systems
- Soderlin Plumbing
- Soderlin Plumbing Heating Inc
- South Bay Mechanical
- South Kansas City Furnace Co
- Southeastern Heatmor
- Southwest Heating & Air
- Sparks Heating & Cooling
- Spec-Air
- Speed Appliance Svc
- Speed Furnace Repairs
- Spotts Brothers Furnace Co
- Stan Swander Heating & AC
- Stanley Fizer Inc
- Stanley Fizer Inc
- Stanley Fizer Inc
- State Sheet Metal Works
- Statewide Heating & Cooling
- Statewide Heating & Cooling
- Steve Spencer Hvac
- Stove Furnace Workers
- Stove Furnace Workers
- Strum Heating & Air Cond
- Stuber's Heating & Air LTD
- Stuber's Heating & Air LTD
- Stuckert Heating & Sheet Metal
- Studer Heating
- Stumbo Air Conditioning & Htg
- Summit Heating & Cooling
- Summit Heating & Sheet Metal
- Sumner Heating
- Sun Mechanical Contractors
- Sunrise Economy Plus
- Superior Heating Co
- Supreme Comfort Heating & AC
- Swarthout's Natural Gas Svc
- T & C Heating & Air Cond
- T & D Cooling & Heating
- T & T Svc
- T M Johnson Brothers Inc
- T's Affordable Htg & Cooling
- Tahoe Heating
- Tahoe Heating Inc
- Tahoe Heating Inc
- Tahoe Plumbing & Heating
- Taki USA
- Tarlton Plumbing Heating Elec
- Taylor Wood Furnaces
- Tedford's Air Cond & Heating
- Tedford's Air Cond & Heating
- Tempest Mechanical Contractors
- Terry's Heating & Cooling
- Thomas Fisher's Heating & AC
- Thomas Heating & Sheet Metal
- Thomas Miller Heating & AC
- Thrifty Supply
- THT Heating & Cooling
- Ticknor Heating & Air Cond
- Tierno Air & Heating
- TJC Heating & Cooling
- TLC Heating & Cooling
- Tom's Heating & Cooling Co
- Tom's Heating & Cooling Co
- Total Comfort Htg & Cooling
- Total Home Improvements
- Total Temp Mechanical Inc
- Total Temp Mechanical Inc
- Towler Heating & Cooling
- Trahan Brothers Inc
- Trane Parts
- Trevino Plumbing & Heating
- Tri-Co Heating & Cooling
- Tri-County Mechanical
- Trivitt's Heating & Air Inc
- Troco Heating & Cooling
- Trone Appliance Ctr
- Trone Appliance Ctr
- Tuck Investment Co
- Tulare County Air Conditioning
- Twin Bridge Htg & Cooling LLC
- Twin City Svc Co
- Two Dogs Heating
- U P Plains Inc
- U S Heating & Cooling
- Ultimate Heating & Air Inc
- Underwood Heating & Air Cond
- United Building Svc
- United Furnaces & Air Cond
- United Sheet Metal Inc
- Utah Valley Heating & Cooling
- Valiant Furnace & AC INC
- Valley Aire Heating & Air Cond
- Vanderploeg & Lanning Heating
- Varner & Rawlings Heating-Air
- Varner & Rawlings Heating-Air
- Vector Six Inc
- Vermiglio's Service
- Village Heating & Sheet Metal
- Virginia Air Distributors
- Viviano's Heating & Air Cond
- Viviano's Heating & Air Cond
- Vorst Plumbing & Heating Inc
- Wabash Valley Heat & Gas Co
- Wabash Valley Heat & Gas Co
- Wabash Valley Heat & Gas Co
- Walker's Refrigeration
- Wallace Heating
- Warren Furnace Co
- Wasatch Heating
- Waste Oil Furnace Co
- Waterfurnace
- Weathervane Heating & Cooling
- Web Air Co
- Web Air Co
- Welch's Heating & Air Cond Inc
- Wescor
- West Coast Appliance Svc
- West Shore Heating & Cooling
- West Valley Heating & Air
- Western Heating & Air Cond
- Western Heating & Sheet Metal
- White's Refrigeration
- White's Refrigeration
- Whitegate Air Cond & Heating
- Whitney-Schmedes Plumbing
- Wholesale Heating Supply
- Wholesale Heating Supply
- Wiley Heating Inc
- Wilkerson & Sons Heating
- William Hyrkas Plumbing & Htg
- Williams Heating & Air Cond
- Williams Refrigeration & Htng
- Wilson's Plumbing & Repair
- Winters Energy Heating-Cooling
- Winters Energy Heating-Cooling
- WOF Waste Oil Furnaces
- Wolverine Climate Control
- Wolverine Climate Control
- Wolverine Heating & Cooling
- Wolves Heating & Air Cond Inc
- Wolves Heating & Air Cond Svc
- Wood Master Quality Outdoor
- World Comfort Inc
- Wright's Air Systems Inc
- Yukon Furnace Co
- Zahorski Heating
- Zancauske Equipment Inc
- Zeddies Heating & Air Cond
- Ziemer Heating & Cooling